The Internet and Network Technologies
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1 The Internet and Network Technologies Don Mason Associate Director Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved Inside vs. Outside Inside the Box What the computer owner actually has possession of Computer s hard drive and other memory Documents Pictures Outlook s Internet Cache CD s and floppy disks ipods Cell Phones External Hard Drives Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 1
2 Inside the Box What the computer owner actually has possession of Outside the Box What is not stored on the owner s computer Online Accounts (Gmail and Yahoo) Internet Shopping Accounts Social Networking Accounts Backups of text messages Cell Site Location Data Using Pen/Trap for Internet DRAS information Subscriber account records Contents of Websites Outside the Box What is not stored on the owner s computer Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 2
3 Networks Network Setup Networks may take two basic forms: Wired each computer connects to a router with a cable Speeds of 100 Mbps Wireless computers connect through a signal that is broadcasted by a router Home wireless networks allow sharing of a connection as far as 750 feet Unauthorized access is much easier Speeds up to 54 Mbps Basic Network Router Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 3
4 Basic Network Router Server What is the Internet? A network of computers? A network of networks? It is a network of millions of networks World Wide Web Plus lots more. WWW is the most obvious part of the Internet, but it isn t all of it Each computer on the Internet uses TCP/IP to communicate The Internet World Wide Web (the Web) Instant messaging (IM) Webcam / Internet Telephone (VoIP) Peer-to-peer (P2P) networks Legacy Systems Usenet Newsgroups Telnet and File transfer (FTP) sites Internet Relay Chat (IRC) Bulletin boards Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 4
5 What Kinds of Computers Can Be on the Internet? Mainframes Laptops Vehicles Cell Phones Personal computers Internet Connectivity Home PCs Internet Service Provider (ISP) Telephone dialin line Network Cable modem connection High-speed data link DSL line Network Network Internet Connections At one time, dial-up was the predominant way to connect to the Internet. Today, dialup has been replaced so the user is constantly connected and receives higher speeds Dial-up 56 Kbps DSL 245 Kbps to 20 Mbps T-3 44 Mbps 3G 200 Kbps; 4G 6.4 Mbps Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 5
6 Internet Connections Many businesses utilize the same connection types as home users, but often subscribe to a higher connection speed Larger businesses use a T1 or T3 connection Requires direct fiber optic connection May cost more than $10,000 per month Even faster networks are available Cost can exceed $5 million per month IP Addressing Each device on the Internet has a unique IP address, such as this one: Computers, servers, and even printers have an IP address Addresses are usually temporary In some cases, static addresses are assigned permanently IP Addressing If a network utilizes a router, there are two IP addresses involved Internal: each computer has an internal IP address that distinguishes the computers on the network External: the unique IP address assigned to the router by the ISP Data is received at the external IP address by the router, and then the router sends the information to the correct internallyaddressed computer Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 6
7 IP Addressing Router Internal: External: Computer 1 Internal: External: Computer 3 Internal: External: Computer 2 Internal: External: Coffee Shop Internal: External: The Office Internal: External: Home External: Why Addressing Matters The Internet is a packet-switched network The component parts of a communication (i.e., the packets) sent to another host may travel by different paths Each packet makes one or more hops along the network on the way to its destination Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 7
8 TCP Packet Switching A B Sending File from Computer A to Computer B TCP Packet Switching A B File is broken into smaller pieces called packets TCP Packet Switching A B The packets are labeled with addressing information Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 8
9 TCP Packet Switching A B The packets are not sent through the same path. There are billions of paths they may take. TCP Packet Switching A B When the packets arrive, they must be put back together. The Path Home Computer Home Router 5 4 Internet Service Provider Website Host Internet Exchange Point Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 9
10 Domains & URLs Domain names are used to help a browser locate a website. For example: http :// Protocol Subdomain Domain Host Top- Level Domains & URLs Domain names provide information about the corresponding computer.com,.gov,.edu,.net,.mil are generic top-level domains for types of organizations.xxx added in 2011 New TLDs like.hotel expected in the near future other top-level domains are geographybased (e.g.,.de for Germany,.fr for France, etc.) Domains & URLs Domain names often serve as an alias for an IP address. For some websites, the IP address is interchangeable with the domain name. For example, you can visit Google by entering either: Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 10
11 Why It Matters How Computers, Networks, and the Internet Work Immense amount of digital data created, transmitted, stored Some created by humans A lot necessarily created by machines in the background Digital Evidence User-created Text (documents, , chats, IM s) Address books Bookmarks Databases Images (photos, drawings, diagrams) Video and sound files Web pages Service provider account subscriber records Digital Evidence Computer/Network-created headers Metadata Activity logs Browser cache, history, cookies Backup and registry files Configuration files Printer spool files Swap files and other transient data Surveillance tapes, recordings Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 11
12 Web Browsers A browser is a computer application that retrieves and displays content from the web This content may include web pages, videos, pictures, and more Popular browsers include Firefox, Internet Explorer, Chrome, and Safari Browser Functions Web browsers also collect a variety of information about a user s online actions and save this information on the computer History Cache / Temporary Internet Files Cookies Browser Functions History Records each page visited within the browser Tags each visit with a time and date Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 12
13 Browser Functions Internet History Browser Functions Cache (Temporary Internet Files) Stores data so that future requests for the same website can be served faster Cache is most obvious when you click the back button. The webpage appears almost immediately because the content is retrieved from your computer, not the server Cache may remain on a computer for weeks at a time or longer Browser Functions Cache (continued) Usually consists only of images and text May allow viewing of an entire website even if the computer is not connected to the Internet Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 13
14 Browser Functions Temporary Internet Files Folder Browser Functions Cookies Text stored by the browser May store a user s site viewing preferences or contents of their shopping cart Some will contain personal information such as a login name or address Cookies rarely, if ever, contain information like passwords or credit card numbers Browser Functions Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 14
15 The Internet: It s more than just Web 2.0 Interactive Internet communities Social networks Blogs Wikis Video or photo sharing sites Online role-playing games Virtual worlds Virtual Worlds features: User chooses name, job, body type, lifestyle, personality Exchange of USD for Second Life currency Money is used to buy clothing, cars, and buildings, and to pay for services Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 15
16 Avatars in Second Life Virtual Worlds Ever wanted to fly? Online Lectures Virtual Worlds Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 16
17 Virtual Worlds Political Rallies Virtual Worlds Social Networking Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 17
18 Social Networking Social Networking Some Social Networking features: Posting Messages (public or private) Personal Profile Picture Sharing Interactive Games Instant Messaging Classified Advertising Social Networking Search Search Results One Result: Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 18
19 Social Networking Consider Cloud Computing ( Web 3.0?) Cloud Computing Basically, obtaining computing resources from someplace outside your own four walls Processing Storage Messaging Databases etc. Entrusting data to third-party providers Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 19
20 The Cloud Everything we currently do. Online Storage Social Networking Peer-Peer File Sharing Chat and IM Virtual worlds and online games What Is a Web App? A program similar to those on your computer, but different because it does not need to be installed Accessed entirely online No need to update Less chance of getting viruses and spyware from installing them Works on any computer with a browser Macs, PCs, cell phones Peer-to-Peer Networking Peer-to-Peer Networking is used to download files from the Internet including: Music Movies Books & Magazines Documents Pornography While not always illegal, it often is. Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 20
21 Client-Server vs. Peer-to-Peer Peer-to-Peer Networking Step 1: User downloads the software Peer-to-Peer Networking Step 2: User searches for the movie and downloads a torrent file Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 21
22 Peer-to-Peer Networking Step 3: User begins to download the file Jim s Download Queue Different users that are sharing the file with Jim Peer-to-Peer Networking Step 4: User is able to play the movie and his computer often continues to share it with other users on BitTorrent Peer-to-Peer Networking Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 22
23 Considerations By default, BitTorrent and other P2P programs share downloaded files Broadband use turned home computers into distributed super-networks for sharing files Design of networks fault tolerant and load balancing Considerations Users on Internet voluntarily Users can decide, through settings in the software, how much or how little of their computers will be open to viewing by others on the Internet Considerations Every download is exact duplicate of the original image Internet Protocol (IP) Address of individual user can be ascertained (identifying unique computer) Successful tracking of IP address reveals computer that had the file available for distribution Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 23
24 Cellular Phones Cellular Phones Modern cell phones have a variety of functions, including: SMS (short message service) MMS (multimedia message service) Phone Calls Cameras File Storage Internet Access Cellular Phones SMS (short message service) 160 characters or less Sent from cell phone to cell phone by way of towers and servers If recipient phone is off, a message will be saved until the phone is turned on Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 24
25 Cellular Phones Sender types message and sends it The message travels through the nearest cell towers The phone company directs the message to the recipient through it s servers The message travels through the nearest cell towers to the recipient The recipient receives the message Cellular Phones Sample Tower/Sector Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 25
26 Questions? Don Mason Associate Director National Center for Justice and the Rule of Law Copyright 2013 National Center for Justice and the Rule of Law All Rights Reserved 26
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