Distributed Systems Principles and Paradigms

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Distributed Systems Principles and Paradigms"

Transcription

1 Distributed Systems Principles and Paradigms Chapter 12 (version October 15, 2007) Maarten van Steen Vrije Universiteit Amsterdam, Faculty of Science Dept. Mathematics and Computer Science Room R4.20. Tel: (020) URL: steen/ 01 Introduction 02 Architectures 03 Processes 04 Communication 05 Naming 06 Synchronization 07 Consistency and Replication 08 Fault Tolerance 09 Security 10 Distributed Object-Based Systems 11 Distributed File Systems 12 Distributed -Based Systems 13 Distributed Coordination-Based Systems 00 1 / Distributed -Based Systems Essence: The WWW is a huge client- system with millions of s; each hosting thousands of hyperlinked documents: machine Browser machine 2. fetches document from local file OS 3. Response 1. Get document request (HTTP) Documents are generally represented in text (plain text, HTML, XML) Alternative types: images, audio, video, but also applications (PDF, PS) Documents may contain scripts that are executed by the client-side software 12 1 Distributed -Based Systems/12.1 Architecture

2 Multi-tiered Architectures Observation: Already very soon, sites were organized into three tiers: 3. Start process to fetch document 1. Get request 6. Return result HTTP request handler CGI program 4. Database interaction 5. HTML document created CGI process Database 12 2 Distributed -Based Systems/12.1 Architecture Services Observation: At a certain point, people started recognizing that it is was more than just user site interaction: sites could offer services to other sites standardization is then badly needed. Look up a service machine application machine application Publish service Stub Stub Communication subsystem Generate stub from WSDL description SOAP Communication subsystem Generate stub from WSDL description Service Service Service description description description (WSDL) (WSDL) (WSDL) Directory service (UDDI) 12 3 Distributed -Based Systems/12.1 Architecture

3 s: browsers Observation: browsers form the s most important client-side sofware. They used to be simple, but that is long ago. User interface Browser engine Display back end Rendering engine Network comm. -side script interpreter HTML/XML parser 12 4 Distributed -Based Systems/12.2 Processes Apache Observation: More than 70% of all sites are based on Apache. The is internally organized more or less according to the steps needed to process an HTTP request: Module Module Function Module Hook Hook Hook Hook Link between function and hook Functions called per hook Apache core Request Response 12 5 Distributed -Based Systems/12.2 Processes

4 Clusters (1/2) Essence: To improve performance and availability, WWW s are often clustered in a way that is transparent to clients: LAN Front end Front end handles all incoming requests and outgoing responses Request Response Problem: The front end may easily get overloaded, so that special measures need to be taken. Transport-layer switching: Front end simply passes the TCP request to one of the s, taking some performance metric into account. Content-aware distribution: Front end reads the content of the HTTP request and then selects the best Distributed -Based Systems/12.2 Processes Clusters (2/2) Question: Why can content-aware distribution be so much better? 6. responses 5. Forward other messages Distributor 3. Hand of TCP connection f Other messages Setup request Switch 1. Pass setup request to a distributor 4. Inform switch Distributor Dispatcher 2. Dispatcher selects 12 7 Distributed -Based Systems/12.2 Processes

5 Communication (1/2) Essence: Communication in the is generally based on HTTP; a relatively simple client- transfer protocol having the following request messages: Operation Head Get Put Post Delete Description Request to return the header of a document Request to return a document to the client Request to store a document Provide data that are to be added to a document (collection) Request to delete a document 12 8 Distributed -Based Systems/12.3 Communication Communication (2/2) C/S Header Contents Accept C The type of documents the client can handle Accept-Charset C The character sets are acceptable for the client Accept- C The document encodings the client can handle Encoding Accept- C The natural language the client can handle Language Authorization C A list of the client s credentials WWW- S Security challenge the client should respond to Authenticate Date C+S Date and time the message was sent ETag S The tags associated with the returned document Expires S The time for how long the response remains valid From C The client s address Host C The TCP address of the document s If-Match C The tags the document should have If-None-Match C The tags the document should not have If-Modified- Since C Tells the to return a document only if it has been modified since the specified time If-Unmodified- Since C Tells the to return a document only if it has not been modified since the specified time Last-Modified S The time the returned document was last modified Location S A document reference to which the client should redirect its request Referer C Refers to client s most recently requested document Upgrade C+S The application protocol sender wants to switch to Warning C+S Information about status of the data in the message 12 9 Distributed -Based Systems/12.3 Communication

6 SOAP Simple Object Access Protocol: Based on XML, this is the standard protocol for communication between services. SOAP is bound to an underlying protocol (i.e., it is not independent from its carrier) Conversational exchange style: Send a document one way, get a filled-in response back. RPC-style exchange: Used to invoke a service Distributed -Based Systems/12.3 Communication A Note on XML Observation: XML has the advantage of allowing selfdescribing documents. Full stop (i.e., it introduces performance problems and is not meant to be read by human beings) env:envelope xmlns:env=" <env:header> <n:alertcontrol xmlns:n=" <n:priority>1</n:priority> <n:expires> t14:00:00-05:00</n:expires> </n:alertcontrol> </env:header> <env:body> <m:alert xmlns:m=" <m:msg>pick up Mary at school at 2pm</m:msg> </m:alert> </env:body> </env:envelope> Distributed -Based Systems/12.3 Communication

7 Naming: URL URL: Uniform Resource Locator tells how and where to access a resource. Scheme Host name Pathname http :// /home/steen/mbox (a) Scheme Host name Port Pathname http :// : 80 /home/steen/mbox (b) Scheme Host name Port Pathname http :// : 80 /home/steen/mbox (c) Examples: http HTTP mailto Mail ftp FTP ftp://ftp.cs.vu.nl/pub/minix/readme file Local file file:/edu/book/work/chp/11/11 data Inline data data:text/plain;charset=iso , %e1%e2%e3 telnet Remote login telnet://flits.cs.vu.nl tel Telephone tel: modem Modem modem: ;type=v Distributed -Based Systems/12.4 Synchronization: DAV Problem: There is a growing need for collaborative auditing of documents, but bare-bones HTTP can t help here. Solution: Distributed Authoring and Versioning. Supports exclusive and shared write locks, which operate on entire documents A lock is passed by means of a lock token; the registers the client(s) holding the lock s modify the document locally and post it back to the along with the lock token Note: There is no specific support for crashed clients holding a lock Distributed -Based Systems/12.5 Synchronization

8 Proxy Caching Basic idea: Sites install a separate proxy that handles all outgoing requests. Proxies subsequently incoming documents. Cache-consistency protocols: Always verify validity by contacting Age-based consistency: T expire = α (T d T lastmodified ) +T d Cooperative caching, by which you first check your neighbors on a miss: 1. Look in local 3. Forward request to Cache proxy 2. Ask neighboring proxy s proxy Cache HTTP Get request proxy Cache Distributed -Based Systems/12.6 Consistency and Replication Replication in Hosting Systems Observation: By-and-large, hosting systems are adopting replication to increase performance. Much research is done to improve their organization. Follows the lines of self-managing systems: Uncontrollable parameters (disturbance / noise) Initial configuration Corrections hosting system Observed output +/- +/- +/- Replica placement Consistency enforcement Request routing Reference input Metric estimation Adjustment triggers Analysis Measured output Distributed -Based Systems/12.6 Consistency and Replication

9 Handling Flash Crowds Observation: We need dynamic adjustment to balance resource usage. Flash crowds introduce a serious problem: 2 days (a) 2 days (b) 6 days (c) 2.5 days (d) Distributed -Based Systems/12.6 Consistency and Replication Replication Content Delivery Network: CDNs act as hosting services to replicate documents across the Internet providing their customers guarantees on high availability and performance (example: Akamai). CDN Cache 6. Get embedded documents (if not already d) 5. Get embedded documents Return IP address client-best CDN DNS 7. Embedded documents 1. Get base document 4 DNS lookups 3 Origin 2. Document with refs to embedded documents Regular DNS system Question: How would consistency be maintained in this system? Distributed -Based Systems/12.6 Consistency and Replication

10 Replication of Apps. (1/3) Observation: Replication becomes more difficult when dealing with databses and such. No single best solution. Edge- side Origin- side query response Content-blind Database copy full/partial data replication Content-aware full schema replication/ query templates Authoritative database Assumption: Updates are carried out at origin, and propagated to edge s Distributed -Based Systems/12.6 Consistency and Replication Replication of Apps. (2/3) Edge- side Origin- side query response Content-blind Database copy full/partial data replication Content-aware full schema replication/ query templates Authoritative database Full replication: high read/write ratio, often in combination with complex queries. Note: replication may possibly speed-down performance when R/W ratio goes down. Partial replication: high read/write ratio, but in combination with simple queries Distributed -Based Systems/12.6 Consistency and Replication

11 Replication of Apps. (3/3) Edge- side Origin- side query response Content-blind Database copy full/partial data replication Content-aware full schema replication/ query templates Authoritative database Content-aware caching: Check for queries at local database, and subscribe for invalidations at the. Works good with range queries and complex queries. Content-blind caching: Simply the result of previous queries. Works great with simple queries that address unique results (e.g., no range queries) Distributed -Based Systems/12.6 Consistency and Replication Security: TLS (SSL) Transport Layer Security: Modern version of the the Secure Socket Layer (SSL), which sits between transport layer and application protocols. Relatively simple protocol that can support mutual authentication using certificates: 1 Possibilities 2 Choices 3 4 [ K+ S ] CA [ K+ C ] CA 5 K+ S ([ R ] C ) Distributed -Based Systems/12.6 Consistency and Replication

Distributed Systems Principles and Paradigms. Chapter 12: Distributed Web-Based Systems. Distributed Web-Based Systems. Multi-tiered architectures

Distributed Systems Principles and Paradigms. Chapter 12: Distributed Web-Based Systems. Distributed Web-Based Systems. Multi-tiered architectures Distributed Systems Principles and Paradigms Maarten van Steen VU Amsterdam, Dept. Computer Science steen@cs.vu.nl Chapter 12: Version: December 10, 2012 1 / 19 Distributed -based systems Essence The WWW

More information

11.1 THE WORLD WIDE WEB

11.1 THE WORLD WIDE WEB 648 DISTRIBUTED DOCUMENT-BASED SYSTEMS CHAP. 11 11.1 THE WORLD WIDE WEB The World Wide Web (WWW) can be viewed as a huge distributed system consisting of millions of clients and servers for accessing linked

More information

1. When will an IP process drop a datagram? 2. When will an IP process fragment a datagram? 3. When will a TCP process drop a segment?

1. When will an IP process drop a datagram? 2. When will an IP process fragment a datagram? 3. When will a TCP process drop a segment? Questions 1. When will an IP process drop a datagram? 2. When will an IP process fragment a datagram? 3. When will a TCP process drop a segment? 4. When will a TCP process resend a segment? CP476 Internet

More information

Setup Guide Access Manager 3.2 SP3

Setup Guide Access Manager 3.2 SP3 Setup Guide Access Manager 3.2 SP3 August 2014 www.netiq.com/documentation Legal Notice THIS DOCUMENT AND THE SOFTWARE DESCRIBED IN THIS DOCUMENT ARE FURNISHED UNDER AND ARE SUBJECT TO THE TERMS OF A LICENSE

More information

Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ MEng. Nguyễn CaoĐạt

Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ MEng. Nguyễn CaoĐạt Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ MEng. Nguyễn CaoĐạt 1 Lecture 10: Application Layer 2 Application Layer Where our applications are running Using services provided by

More information

Globule: a Platform for Self-Replicating Web Documents

Globule: a Platform for Self-Replicating Web Documents Globule: a Platform for Self-Replicating Web Documents Guillaume Pierre Maarten van Steen Vrije Universiteit, Amsterdam Internal report IR-483 January 2001 Abstract Replicating Web documents at a worldwide

More information

http://alice.teaparty.wonderland.com:23054/dormouse/bio.htm

http://alice.teaparty.wonderland.com:23054/dormouse/bio.htm Client/Server paradigm As we know, the World Wide Web is accessed thru the use of a Web Browser, more technically known as a Web Client. 1 A Web Client makes requests of a Web Server 2, which is software

More information

Computer Networks. Lecture 7: Application layer: FTP and HTTP. Marcin Bieńkowski. Institute of Computer Science University of Wrocław

Computer Networks. Lecture 7: Application layer: FTP and HTTP. Marcin Bieńkowski. Institute of Computer Science University of Wrocław Computer Networks Lecture 7: Application layer: FTP and Marcin Bieńkowski Institute of Computer Science University of Wrocław Computer networks (II UWr) Lecture 7 1 / 23 Reminder: Internet reference model

More information

Content Distribution Networks (CDNs)

Content Distribution Networks (CDNs) 229 Content Distribution Networks (CDNs) A content distribution network can be viewed as a global web replication. main idea: each replica is located in a different geographic area, rather then in the

More information

Setup Guide Access Manager Appliance 3.2 SP3

Setup Guide Access Manager Appliance 3.2 SP3 Setup Guide Access Manager Appliance 3.2 SP3 August 2014 www.netiq.com/documentation Legal Notice THIS DOCUMENT AND THE SOFTWARE DESCRIBED IN THIS DOCUMENT ARE FURNISHED UNDER AND ARE SUBJECT TO THE TERMS

More information

Setup Guide Access Manager 4.0 SP1

Setup Guide Access Manager 4.0 SP1 Setup Guide Access Manager 4.0 SP1 May 2014 www.netiq.com/documentation Legal Notice THIS DOCUMENT AND THE SOFTWARE DESCRIBED IN THIS DOCUMENT ARE FURNISHED UNDER AND ARE SUBJECT TO THE TERMS OF A LICENSE

More information

World Wide Web. Before WWW

World Wide Web. Before WWW World Wide Web Joao.Neves@fe.up.pt Before WWW Major search tools: Gopher and Archie Archie Search FTP archives indexes Filename based queries Gopher Friendly interface Menu driven queries João Neves 2

More information

Interwise Connect. Working with Reverse Proxy Version 7.x

Interwise Connect. Working with Reverse Proxy Version 7.x Working with Reverse Proxy Version 7.x Table of Contents BACKGROUND...3 Single Sign On (SSO)... 3 Interwise Connect... 3 INTERWISE CONNECT WORKING WITH REVERSE PROXY...4 Architecture... 4 Interwise Web

More information

Web Development. Owen Sacco. ICS2205/ICS2230 Web Intelligence

Web Development. Owen Sacco. ICS2205/ICS2230 Web Intelligence Web Development Owen Sacco ICS2205/ICS2230 Web Intelligence Brief Course Overview An introduction to Web development Server-side Scripting Web Servers PHP Client-side Scripting HTML & CSS JavaScript &

More information

Internet Technologies. World Wide Web (WWW) Proxy Server Network Address Translator (NAT)

Internet Technologies. World Wide Web (WWW) Proxy Server Network Address Translator (NAT) Internet Technologies World Wide Web (WWW) Proxy Server Network Address Translator (NAT) What is WWW? System of interlinked Hypertext documents Text, Images, Videos, and other multimedia documents navigate

More information

Web Services. Is this the future of web based software development?

Web Services. Is this the future of web based software development? Web Services Is this the future of web based software development? Introducing Web Services The growth of the web proves the effectiveness of using simple protocols over the Internet as the basis for a

More information

Distributed Systems. 25. Content Delivery Networks (CDN) 2014 Paul Krzyzanowski. Rutgers University. Fall 2014

Distributed Systems. 25. Content Delivery Networks (CDN) 2014 Paul Krzyzanowski. Rutgers University. Fall 2014 Distributed Systems 25. Content Delivery Networks (CDN) Paul Krzyzanowski Rutgers University Fall 2014 November 16, 2014 2014 Paul Krzyzanowski 1 Motivation Serving web content from one location presents

More information

HTTP. Internet Engineering. Fall 2015. Bahador Bakhshi CE & IT Department, Amirkabir University of Technology

HTTP. Internet Engineering. Fall 2015. Bahador Bakhshi CE & IT Department, Amirkabir University of Technology HTTP Internet Engineering Fall 2015 Bahador Bakhshi CE & IT Department, Amirkabir University of Technology Questions Q1) How do web server and client browser talk to each other? Q1.1) What is the common

More information

Content Delivery Networks

Content Delivery Networks Content Delivery Networks Terena 2000 ftp://ftpeng.cisco.com/sgai/t2000cdn.pdf Silvano Gai Cisco Systems, USA Politecnico di Torino, IT sgai@cisco.com Terena 2000 1 Agenda What are Content Delivery Networks?

More information

Certified Secure Web Application Secure Development Checklist

Certified Secure Web Application Secure Development Checklist www.certifiedsecure.com info@certifiedsecure.com Tel.: +31 (0)70 310 13 40 Loire 128-A 2491 AJ The Hague The Netherlands About Certified Secure Checklist Certified Secure exists to encourage and fulfill

More information

Oracle Collaboration Suite

Oracle Collaboration Suite Oracle Collaboration Suite Firewall and Load Balancer Architecture Release 2 (9.0.4) Part No. B15609-01 November 2004 This document discusses the use of firewall and load balancer components with Oracle

More information

Security IIS Service Lesson 6

Security IIS Service Lesson 6 Security IIS Service Lesson 6 Skills Matrix Technology Skill Objective Domain Objective # Configuring Certificates Configure SSL security 3.6 Assigning Standard and Special NTFS Permissions Enabling and

More information

Web Caching. Chapter 11 από: Web Protocols and Caching, B. Krishnamurthy, J. Rexford

Web Caching. Chapter 11 από: Web Protocols and Caching, B. Krishnamurthy, J. Rexford Web Caching Chapter 11 από: Web Protocols and Caching, B. Krishnamurthy, J. Rexford Introduction The rapid growth of WWW increased network traffic Increased user-perceived latency WWW applications in contrast

More information

LabVIEW Internet Toolkit User Guide

LabVIEW Internet Toolkit User Guide LabVIEW Internet Toolkit User Guide Version 6.0 Contents The LabVIEW Internet Toolkit provides you with the ability to incorporate Internet capabilities into VIs. You can use LabVIEW to work with XML documents,

More information

Front-End Performance Testing and Optimization

Front-End Performance Testing and Optimization Front-End Performance Testing and Optimization Abstract Today, web user turnaround starts from more than 3 seconds of response time. This demands performance optimization on all application levels. Client

More information

The Web History (I) The Web History (II)

The Web History (I) The Web History (II) Goals of Today s Lecture EE 122: The World Wide Web Ion Stoica TAs: Junda Liu, DK Moon, David Zats http://inst.eecs.berkeley.edu/~ee122/ (Materials with thanks to Vern Paxson, Jennifer Rexford, and colleagues

More information

Architecture and Data Flow Overview. BlackBerry Enterprise Service 10 721-08877-123 Version: 10.2. Quick Reference

Architecture and Data Flow Overview. BlackBerry Enterprise Service 10 721-08877-123 Version: 10.2. Quick Reference Architecture and Data Flow Overview BlackBerry Enterprise Service 10 721-08877-123 Version: Quick Reference Published: 2013-11-28 SWD-20131128130321045 Contents Key components of BlackBerry Enterprise

More information

SiteCelerate white paper

SiteCelerate white paper SiteCelerate white paper Arahe Solutions SITECELERATE OVERVIEW As enterprises increases their investment in Web applications, Portal and websites and as usage of these applications increase, performance

More information

Repeater. BrowserStack Local. browserstack.com 1. BrowserStack Local makes a REST call using the user s access key to browserstack.

Repeater. BrowserStack Local. browserstack.com 1. BrowserStack Local makes a REST call using the user s access key to browserstack. Connection Setup Process makes a REST call using the user s access key to chooses a repeater for establishing a secure connection for Local Testing. The repeater exists within the BrowserStack cloud infrastructure.

More information

Dell Desktop Workspace 4.1.2. Architecture Planning Guide

Dell Desktop Workspace 4.1.2. Architecture Planning Guide Dell Copyright 2014 Moka5, Inc. All rights reserved. Moka5, MokaFive, LivePC, and the Moka5 logo are trademarks of Moka5, Inc. All other product or company names may be trademarks of their respective owners.

More information

The presentation explains how to create and access the web services using the user interface. WebServices.ppt. Page 1 of 14

The presentation explains how to create and access the web services using the user interface. WebServices.ppt. Page 1 of 14 The presentation explains how to create and access the web services using the user interface. Page 1 of 14 The aim of this presentation is to familiarize you with the processes of creating and accessing

More information

<Insert Picture Here> Oracle Web Cache 11g Overview

<Insert Picture Here> Oracle Web Cache 11g Overview Oracle Web Cache 11g Overview Oracle Web Cache Oracle Web Cache is a secure reverse proxy cache and a compression engine deployed between Browser and HTTP server Browser and Content

More information

Adding Advanced Caching and Replication Techniques to the Apache Web Server

Adding Advanced Caching and Replication Techniques to the Apache Web Server Adding Advanced Caching and Replication Techniques to the Apache Web Server Joachim Marder, Steffen Rothkugel, Peter Sturm University of Trier D-54286 Trier, Germany Email: marder@jam-software.com, sroth@uni-trier.de,

More information

DEPLOYMENT OF I M INTOUCH (IIT) IN TYPICAL NETWORK ENVIRONMENTS. Single Computer running I m InTouch with a DSL or Cable Modem Internet Connection

DEPLOYMENT OF I M INTOUCH (IIT) IN TYPICAL NETWORK ENVIRONMENTS. Single Computer running I m InTouch with a DSL or Cable Modem Internet Connection DEPLOYMENT OF I M INTOUCH (IIT) IN TYPICAL NETWORK ENVIRONMENTS Introduction I m InTouch is a personal remote access application that allows a user to access the data on his or her PC from a remote location,

More information

WWW. World Wide Web Aka The Internet. dr. C. P. J. Koymans. Informatics Institute Universiteit van Amsterdam. November 30, 2007

WWW. World Wide Web Aka The Internet. dr. C. P. J. Koymans. Informatics Institute Universiteit van Amsterdam. November 30, 2007 WWW World Wide Web Aka The Internet dr. C. P. J. Koymans Informatics Institute Universiteit van Amsterdam November 30, 2007 dr. C. P. J. Koymans (UvA) WWW November 30, 2007 1 / 36 WWW history (1) 1968

More information

Basic & Advanced Administration for Citrix NetScaler 9.2

Basic & Advanced Administration for Citrix NetScaler 9.2 Basic & Advanced Administration for Citrix NetScaler 9.2 Day One Introducing and deploying Citrix NetScaler Key - Brief Introduction to the NetScaler system Planning a NetScaler deployment Deployment scenarios

More information

Replacements TECHNICAL REFERENCE. DTCCSOLUTIONS Dec 2009. Copyright 2009 Depository Trust Clearing Corporation. All Rights Reserved.

Replacements TECHNICAL REFERENCE. DTCCSOLUTIONS Dec 2009. Copyright 2009 Depository Trust Clearing Corporation. All Rights Reserved. TECHNICAL REFERENCE Replacements Page 1 Table of Contents Table of Contents 1 Overview... 3 1.1 Replacements Features... 3 2 Roles and Responsibilities... 4 2.1 Sender (Receiving Carrier)... 4 2.2 Recipient

More information

BlackBerry Enterprise Service 10. Version: 10.2. Configuration Guide

BlackBerry Enterprise Service 10. Version: 10.2. Configuration Guide BlackBerry Enterprise Service 10 Version: 10.2 Configuration Guide Published: 2015-02-27 SWD-20150227164548686 Contents 1 Introduction...7 About this guide...8 What is BlackBerry Enterprise Service 10?...9

More information

Developing ASP.NET MVC 4 Web Applications Online Training

Developing ASP.NET MVC 4 Web Applications Online Training Course Outline Plan the Application Layers Plan data access Plan for separation of concern Appropriate use of models, views, and controllers Choose between client-side and server-side processing Design

More information

Network Technologies

Network Technologies Network Technologies Glenn Strong Department of Computer Science School of Computer Science and Statistics Trinity College, Dublin January 28, 2014 What Happens When Browser Contacts Server I Top view:

More information

Configuration Guide BES12. Version 12.3

Configuration Guide BES12. Version 12.3 Configuration Guide BES12 Version 12.3 Published: 2016-01-19 SWD-20160119132230232 Contents About this guide... 7 Getting started... 8 Configuring BES12 for the first time...8 Configuration tasks for managing

More information

GLOBAL SERVER LOAD BALANCING WITH SERVERIRON

GLOBAL SERVER LOAD BALANCING WITH SERVERIRON APPLICATION NOTE GLOBAL SERVER LOAD BALANCING WITH SERVERIRON Growing Global Simply by connecting to the Internet, local businesses transform themselves into global ebusiness enterprises that span the

More information

BlackBerry Enterprise Service 10. Secure Work Space for ios and Android Version: 10.1.1. Security Note

BlackBerry Enterprise Service 10. Secure Work Space for ios and Android Version: 10.1.1. Security Note BlackBerry Enterprise Service 10 Secure Work Space for ios and Android Version: 10.1.1 Security Note Published: 2013-06-21 SWD-20130621110651069 Contents 1 About this guide...4 2 What is BlackBerry Enterprise

More information

Web Application Hosting Cloud Architecture

Web Application Hosting Cloud Architecture Web Application Hosting Cloud Architecture Executive Overview This paper describes vendor neutral best practices for hosting web applications using cloud computing. The architectural elements described

More information

SSL VPN Server Guide. Access Manager 3.2 SP2. June 2013

SSL VPN Server Guide. Access Manager 3.2 SP2. June 2013 SSL VPN Server Guide Access Manager 3.2 SP2 June 2013 Legal Notice THIS DOCUMENT AND THE SOFTWARE DESCRIBED IN THIS DOCUMENT ARE FURNISHED UNDER AND ARE SUBJECT TO THE TERMS OF A LICENSE AGREEMENT OR A

More information

Table of Contents. This whitepaper outlines how to configure the operating environment for MailEnable s implementation of Exchange ActiveSync.

Table of Contents. This whitepaper outlines how to configure the operating environment for MailEnable s implementation of Exchange ActiveSync. This whitepaper outlines how to configure the operating environment for MailEnable s implementation of Exchange ActiveSync. Table of Contents Overview... 2 Evaluating Exchange ActiveSync for MailEnable...

More information

sessionx Desarrollo de Aplicaciones en Red Web Applications History (1) Content History (2) History (3)

sessionx Desarrollo de Aplicaciones en Red Web Applications History (1) Content History (2) History (3) sessionx Desarrollo de Aplicaciones en Red José Rafael Rojano Cáceres http://www.uv.mx/rrojano Web Applications 1 2 Content History (1) History Http CGI Web Tiers ARPANet Email, Ftp, IRC, news Explosive

More information

Table of Contents. Open-Xchange Authentication & Session Handling. 1.Introduction...3

Table of Contents. Open-Xchange Authentication & Session Handling. 1.Introduction...3 Open-Xchange Authentication & Session Handling Table of Contents 1.Introduction...3 2.System overview/implementation...4 2.1.Overview... 4 2.1.1.Access to IMAP back end services...4 2.1.2.Basic Implementation

More information

Chapter 6 Virtual Private Networking Using SSL Connections

Chapter 6 Virtual Private Networking Using SSL Connections Chapter 6 Virtual Private Networking Using SSL Connections The FVS336G ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN provides a hardwarebased SSL VPN solution designed specifically to provide

More information

AquaLogic Service Bus

AquaLogic Service Bus AquaLogic Bus Wolfgang Weigend Principal Systems Engineer BEA Systems 1 What to consider when looking at ESB? Number of planned business access points Reuse across organization Reduced cost of ownership

More information

BlackBerry Enterprise Service 10. Universal Device Service Version: 10.2. Administration Guide

BlackBerry Enterprise Service 10. Universal Device Service Version: 10.2. Administration Guide BlackBerry Enterprise Service 10 Universal Service Version: 10.2 Administration Guide Published: 2015-02-24 SWD-20150223125016631 Contents 1 Introduction...9 About this guide...10 What is BlackBerry

More information

Adobe Systems Incorporated

Adobe Systems Incorporated Adobe Connect 9.2 Page 1 of 8 Adobe Systems Incorporated Adobe Connect 9.2 Hosted Solution June 20 th 2014 Adobe Connect 9.2 Page 2 of 8 Table of Contents Engagement Overview... 3 About Connect 9.2...

More information

Fairsail REST API: Guide for Developers

Fairsail REST API: Guide for Developers Fairsail REST API: Guide for Developers Version 1.02 FS-API-REST-PG-201509--R001.02 Fairsail 2015. All rights reserved. This document contains information proprietary to Fairsail and may not be reproduced,

More information

Installing and Configuring vcenter Support Assistant

Installing and Configuring vcenter Support Assistant Installing and Configuring vcenter Support Assistant vcenter Support Assistant 5.5 This document supports the version of each product listed and supports all subsequent versions until the document is replaced

More information

NMS300 Network Management System

NMS300 Network Management System NMS300 Network Management System User Manual June 2013 202-11289-01 350 East Plumeria Drive San Jose, CA 95134 USA Support Thank you for purchasing this NETGEAR product. After installing your device, locate

More information

Configuration Guide BES12. Version 12.2

Configuration Guide BES12. Version 12.2 Configuration Guide BES12 Version 12.2 Published: 2015-07-07 SWD-20150630131852557 Contents About this guide... 8 Getting started... 9 Administrator permissions you need to configure BES12... 9 Obtaining

More information

M3-R3: INTERNET AND WEB DESIGN

M3-R3: INTERNET AND WEB DESIGN M3-R3: INTERNET AND WEB DESIGN NOTE: 1. There are TWO PARTS in this Module/Paper. PART ONE contains FOUR questions and PART TWO contains FIVE questions. 2. PART ONE is to be answered in the TEAR-OFF ANSWER

More information

Load testing with WAPT: Quick Start Guide

Load testing with WAPT: Quick Start Guide Load testing with WAPT: Quick Start Guide This document describes step by step how to create a simple typical test for a web application, execute it and interpret the results. A brief insight is provided

More information

Detailed Revision History: Advanced Internet System Management (v5.07)

Detailed Revision History: Advanced Internet System Management (v5.07) Detailed Revision History 1 Detailed Revision History: Advanced Internet System Management (v5.07) This detailed revision history document identifies the differences in Advanced Internet System Management

More information

Classic Grid Architecture

Classic Grid Architecture Peer-to to-peer Grids Classic Grid Architecture Resources Database Database Netsolve Collaboration Composition Content Access Computing Security Middle Tier Brokers Service Providers Middle Tier becomes

More information

Distributed Systems. 23. Content Delivery Networks (CDN) Paul Krzyzanowski. Rutgers University. Fall 2015

Distributed Systems. 23. Content Delivery Networks (CDN) Paul Krzyzanowski. Rutgers University. Fall 2015 Distributed Systems 23. Content Delivery Networks (CDN) Paul Krzyzanowski Rutgers University Fall 2015 November 17, 2015 2014-2015 Paul Krzyzanowski 1 Motivation Serving web content from one location presents

More information

10CS73:Web Programming

10CS73:Web Programming 10CS73:Web Programming Question Bank Fundamentals of Web: 1.What is WWW? 2. What are domain names? Explain domain name conversion with diagram 3.What are the difference between web browser and web server

More information

DottsConnected SHAREPOINT 2010 ADMIN TRAINING. Exercise 1: Create Dedicated Service Accounts in Active Directory

DottsConnected SHAREPOINT 2010 ADMIN TRAINING. Exercise 1: Create Dedicated Service Accounts in Active Directory DottsConnected SHAREPOINT 2010 ADMIN TRAINING Module 1 - Getting started with SharePoint 2010 This introductory module introduces students to the fundamental terminology and architecture of SharePoint

More information

Configuration Information

Configuration Information Configuration Information Email Security Gateway Version 7.7 This chapter describes some basic Email Security Gateway configuration settings, some of which can be set in the first-time Configuration Wizard.

More information

Distributed Systems. 24. Content Delivery Networks (CDN) 2013 Paul Krzyzanowski. Rutgers University. Fall 2013

Distributed Systems. 24. Content Delivery Networks (CDN) 2013 Paul Krzyzanowski. Rutgers University. Fall 2013 Distributed Systems 24. Content Delivery Networks (CDN) Paul Krzyzanowski Rutgers University Fall 2013 November 27, 2013 2013 Paul Krzyzanowski 1 Motivation Serving web content from one location presents

More information

redcoal EmailSMS for MS Outlook and Lotus Notes

redcoal EmailSMS for MS Outlook and Lotus Notes redcoal EmailSMS for MS Outlook and Lotus Notes Technical Support: support@redcoal.com Or visit http://www.redcoal.com/ All Documents prepared or furnished by redcoal Pty Ltd remains the property of redcoal

More information

Secure Web Appliance. Reverse Proxy

Secure Web Appliance. Reverse Proxy Secure Web Appliance Reverse Proxy Table of Contents 1. Introduction... 1 1.1. About CYAN Secure Web Appliance... 1 1.2. About Reverse Proxy... 1 1.3. About this Manual... 1 1.3.1. Document Conventions...

More information

X-Road is a platform independent data exchange layer between different databases and information systems.

X-Road is a platform independent data exchange layer between different databases and information systems. What is? is a platform independent data exchange layer between different databases and information systems. Platform independence is achieved by using standardised SOAP protocol. Services services are

More information

CTIS 256 Web Technologies II. Week # 1 Serkan GENÇ

CTIS 256 Web Technologies II. Week # 1 Serkan GENÇ CTIS 256 Web Technologies II Week # 1 Serkan GENÇ Introduction Aim: to be able to develop web-based applications using PHP (programming language) and mysql(dbms). Internet is a huge network structure connecting

More information

From Internet Data Centers to Data Centers in the Cloud

From Internet Data Centers to Data Centers in the Cloud From Internet Data Centers to Data Centers in the Cloud This case study is a short extract from a keynote address given to the Doctoral Symposium at Middleware 2009 by Lucy Cherkasova of HP Research Labs

More information

www.novell.com/documentation SSL VPN Server Guide Access Manager 3.1 SP5 January 2013

www.novell.com/documentation SSL VPN Server Guide Access Manager 3.1 SP5 January 2013 www.novell.com/documentation SSL VPN Server Guide Access Manager 3.1 SP5 January 2013 Legal Notices Novell, Inc., makes no representations or warranties with respect to the contents or use of this documentation,

More information

Clusterpoint Network Traffic Security System. User manual

Clusterpoint Network Traffic Security System. User manual Clusterpoint Network Traffic Security System User manual User manual revision 2.1 Clusterpoint Ltd. May 2014 Table of Contents Clusterpoint Network Traffic Security System... 4 How it works... 4 How NTSS

More information

Chapter 8 Router and Network Management

Chapter 8 Router and Network Management Chapter 8 Router and Network Management This chapter describes how to use the network management features of your ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN. These features can be found by

More information

Working With Virtual Hosts on Pramati Server

Working With Virtual Hosts on Pramati Server Working With Virtual Hosts on Pramati Server 13 Overview Virtual hosting allows a single machine to be addressed by different names. There are two ways for configuring Virtual Hosts. They are: Domain Name

More information

Web Browsing Quality of Experience Score

Web Browsing Quality of Experience Score Web Browsing Quality of Experience Score A Sandvine Technology Showcase Contents Executive Summary... 1 Introduction to Web QoE... 2 Sandvine s Web Browsing QoE Metric... 3 Maintaining a Web Page Library...

More information

Lecture 8a: WWW Proxy Servers and Cookies

Lecture 8a: WWW Proxy Servers and Cookies Internet and Intranet Protocols and Applications Lecture 8a: WWW Proxy Servers and Cookies March 12, 2003 Arthur Goldberg Computer Science Department New York University artg@cs.nyu.edu Terminology Origin

More information

Configuring Citrix NetScaler for IBM WebSphere Application Services

Configuring Citrix NetScaler for IBM WebSphere Application Services White Paper Configuring Citrix NetScaler for IBM WebSphere Application Services A deployment guide for configuring NetScaler load balancing and content switching When deploying IBM WebSphere Application

More information

HTTP connections can use transport-layer security (SSL or its successor, TLS) to provide data integrity

HTTP connections can use transport-layer security (SSL or its successor, TLS) to provide data integrity Improving File Sharing Security: A Standards Based Approach A Xythos Software White Paper January 2, 2003 Abstract Increasing threats to enterprise networks coupled with an ever-growing dependence upon

More information

SSL VPN Technology White Paper

SSL VPN Technology White Paper SSL VPN Technology White Paper Keywords: SSL VPN, HTTPS, Web access, TCP access, IP access Abstract: SSL VPN is an emerging VPN technology based on HTTPS. This document describes its implementation and

More information

CONTENT of this CHAPTER

CONTENT of this CHAPTER CONTENT of this CHAPTER v DNS v HTTP and WWW v EMAIL v SNMP 3.2.1 WWW and HTTP: Basic Concepts With a browser you can request for remote resource (e.g. an HTML file) Web server replies to queries (e.g.

More information

Distributed Systems 19. Content Delivery Networks (CDN) Paul Krzyzanowski pxk@cs.rutgers.edu

Distributed Systems 19. Content Delivery Networks (CDN) Paul Krzyzanowski pxk@cs.rutgers.edu Distributed Systems 19. Content Delivery Networks (CDN) Paul Krzyzanowski pxk@cs.rutgers.edu 1 Motivation Serving web content from one location presents problems Scalability Reliability Performance Flash

More information

Network-Enabled Devices, AOS v.5.x.x. Content and Purpose of This Guide...1 User Management...2 Types of user accounts2

Network-Enabled Devices, AOS v.5.x.x. Content and Purpose of This Guide...1 User Management...2 Types of user accounts2 Contents Introduction--1 Content and Purpose of This Guide...........................1 User Management.........................................2 Types of user accounts2 Security--3 Security Features.........................................3

More information

Overview. 15-441 15-441 Computer Networking 15-641. Lecture 18: Delivering Content Content Delivery Networks Peter Steenkiste

Overview. 15-441 15-441 Computer Networking 15-641. Lecture 18: Delivering Content Content Delivery Networks Peter Steenkiste Overview 5-44 5-44 Computer Networking 5-64 Lecture 8: Delivering Content Content Delivery Networks Peter Steenkiste Fall 04 www.cs.cmu.edu/~prs/5-44-f4 Web Consistent hashing Peer-to-peer CDN Motivation

More information

OpenScape Voice V8 Application Developers Manual. Programming Guide A31003-H8080-R100-2-7620

OpenScape Voice V8 Application Developers Manual. Programming Guide A31003-H8080-R100-2-7620 OpenScape Voice V8 Application Developers Manual Programming Guide A31003-H8080-R100-2-7620 Our Quality and Environmental Management Systems are implemented according to the requirements of the ISO9001

More information

Protocolo HTTP. Web and HTTP. HTTP overview. HTTP overview

Protocolo HTTP. Web and HTTP. HTTP overview. HTTP overview Web and HTTP Protocolo HTTP Web page consists of objects Object can be HTML file, JPEG image, Java applet, audio file, Web page consists of base HTML-file which includes several referenced objects Each

More information

How to configure Client side certificate authentication for authorization-only access / Active Sync URL s

How to configure Client side certificate authentication for authorization-only access / Active Sync URL s How to configure Client side certificate authentication for authorization-only access / Active Sync URL s Juniper Networks, Inc. Overview: Authorization-only access is similar to a reverse proxy. Typically,

More information

Distributed Systems: Concepts and Design

Distributed Systems: Concepts and Design Distributed Systems: Concepts and Design Edition 3 By George Coulouris, Jean Dollimore and Tim Kindberg Addison-Wesley, Pearson Education 2001. Chapter 2 Exercise Solutions 2.1 Describe and illustrate

More information

1. Comments on reviews a. Need to avoid just summarizing web page asks you for:

1. Comments on reviews a. Need to avoid just summarizing web page asks you for: 1. Comments on reviews a. Need to avoid just summarizing web page asks you for: i. A one or two sentence summary of the paper ii. A description of the problem they were trying to solve iii. A summary of

More information

A Tool for Evaluation and Optimization of Web Application Performance

A Tool for Evaluation and Optimization of Web Application Performance A Tool for Evaluation and Optimization of Web Application Performance Tomáš Černý 1 cernyto3@fel.cvut.cz Michael J. Donahoo 2 jeff_donahoo@baylor.edu Abstract: One of the main goals of web application

More information

Microsoft Office Communications Server 2007 & Coyote Point Equalizer Deployment Guide DEPLOYMENT GUIDE

Microsoft Office Communications Server 2007 & Coyote Point Equalizer Deployment Guide DEPLOYMENT GUIDE Microsoft Office Communications Server 2007 & Coyote Point Equalizer DEPLOYMENT GUIDE Table of Contents Unified Communications Application Delivery...2 General Requirements...6 Equalizer Configuration...7

More information

Device Log Export ENGLISH

Device Log Export ENGLISH Figure 14: Topic Selection Page Device Log Export This option allows you to export device logs in three ways: by E-Mail, FTP, or HTTP. Each method is described in the following sections. NOTE: If the E-Mail,

More information

Chapter 17. Transport-Level Security

Chapter 17. Transport-Level Security Chapter 17 Transport-Level Security Web Security Considerations The World Wide Web is fundamentally a client/server application running over the Internet and TCP/IP intranets The following characteristics

More information

Load Balancing Web Applications

Load Balancing Web Applications Mon Jan 26 2004 18:14:15 America/New_York Published on The O'Reilly Network (http://www.oreillynet.com/) http://www.oreillynet.com/pub/a/onjava/2001/09/26/load.html See this if you're having trouble printing

More information

IBM SPSS Collaboration and Deployment Services Version 6 Release 0. Single Sign-On Services Developer's Guide

IBM SPSS Collaboration and Deployment Services Version 6 Release 0. Single Sign-On Services Developer's Guide IBM SPSS Collaboration and Deployment Services Version 6 Release 0 Single Sign-On Services Developer's Guide Note Before using this information and the product it supports, read the information in Notices

More information

FINAL DoIT 04.01.2013- v.8 APPLICATION SECURITY PROCEDURE

FINAL DoIT 04.01.2013- v.8 APPLICATION SECURITY PROCEDURE Purpose: This procedure identifies what is required to ensure the development of a secure application. Procedure: The five basic areas covered by this document include: Standards for Privacy and Security

More information

1 Introduction: Network Applications

1 Introduction: Network Applications 1 Introduction: Network Applications Some Network Apps E-mail Web Instant messaging Remote login P2P file sharing Multi-user network games Streaming stored video clips Internet telephone Real-time video

More information

Distributed redirection for the World-Wide Web (extended version)

Distributed redirection for the World-Wide Web (extended version) Distributed redirection for the World-Wide Web (extended version) Aline Baggio and Maarten van Steen October 2004 Technical report IR-CS-009 Abstract Replication in the World-Wide Web covers a wide range

More information

Developers Integration Lab (DIL) System Architecture, Version 1.0

Developers Integration Lab (DIL) System Architecture, Version 1.0 Developers Integration Lab (DIL) System Architecture, Version 1.0 11/13/2012 Document Change History Version Date Items Changed Since Previous Version Changed By 0.1 10/01/2011 Outline Laura Edens 0.2

More information

SOA Software: Troubleshooting Guide for Policy Manager for DataPower

SOA Software: Troubleshooting Guide for Policy Manager for DataPower SOA Software: Troubleshooting Guide for Policy Manager for DataPower Troubleshooting Guide for Policy Manager for DataPower 1 SOA Software Policy Manager Troubleshooting Guide for Policy Manager for DataPower

More information

Embedded Document Accounting Solution (edas) for Cost Recovery. Administrator's Guide

Embedded Document Accounting Solution (edas) for Cost Recovery. Administrator's Guide Embedded Document Accounting Solution (edas) for Cost Recovery Administrator's Guide September 2013 www.lexmark.com Contents 2 Contents Overview...4 Getting started...5 Understanding installation requirements...5

More information