CA106 Web Design. Dr. Dónal Fitzpatrick, School of Computing Room l2.48, Extension 8929,
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1 CA106 Web Design Dr. Dónal Fitzpatrick, School of Computing Room l2.48, Extension 8929,
2 History of the Internet Terminals attached to mainframe computer From mid 1960 s packet-switching network US Government agency + few universities 1970 s US Advanced Research Projects Agency (ARPA) furthers packet-switching development and develops ARPANET. X25 and other network types being developed
3 1973: First intercontinental connection (University College London) [Bill Gates creates Microsoft] 1978: First international packet-switching network (IPSS) Hosts became responsible for reliability of network USENET develops , chat, discussion etc. Commercialisation of network 1981 Standards published. TCP/IP developed 1989 Europe integrated with US internet
4 Developments 1985: Forerunner of America Online (AOL) launched by Steve Case 1990: Tim Berners-Lee develops Internet computer language and address system 1991: First browser (text) 1993: Mosaic launched [1994: First World Wide Web Consortium Conference] 1995 Amazon launched by Jeff Bezoz
5 1995: ebay basis set up 1995: Yahoo launched 1998: Google set up 1998: ICANN, the Internet Corporation for Assigned Names and Numbers established 2000:..the dot com bubble 2004: Google stock market launch
6 This Course How the internet works Architecture Browsers, servers etc Web authoring Creating web sites using HTML Advanced technologies - XHTML/CSS JavaScript etc. Design tools
7 Organisation of Course Two lectures per week Monday at 11 and 12. Lab sessions only if required End of semester exam worth 50% of module marks Continuous assessment (projects) worth 50% of module marks Course materials available on Moodle: Log on to and choose CA106
8 What is the Internet? Network of networks Computers communicate over the Internet using TCP/IP (Transmission Control Protocol/Internet Protocol) Client/server architecture
9 Who runs the Internet? Internet Society IETF (Internet Engineering Task Force) TCP/IP W3C (World Wide Web Consortium) MIT Private Companies domain registration
10 Domain Registration IANA (Internet Assigned Numbers Authority) allocates blocks of numbers to five regional IP address registries Regional authorities allocate smaller blocks to large Internet Service Providers (ISP s) which allocate blocks to smaller ISP s..which allocate smaller blocks to network customers which allocate addresses to individual machines
11
12 Infrastructure of the Internet How computers send data across the Internet How TCP/IP works How addresses and domain names work How routers work
13 How computers send data across the Internet TCP/IP protocol Hardware: Hubs Bridges Gateways Repeaters Routers
14 How computers send data TCP breaks data into packets Computer sends these packets on local network, through ISP etc. Packets travel through many levels of networks, computers etc to reach destination
15 Hardware which transmits data Hub links groups of computers Bridge links one Local Area Network (LAN) with another LAN Gateway allows communication between different types of networks Repeater amplifies data (needed for long distance transmission) Router used when transmitting between networks; selects quickest route
16 TCP/IP Messages broken into packets + data to help the packet find its way through Internet (TCP) Series of switches or routers (IP) ensures packets arrive at correct place
17 Packets Hardware restriction packets of 1500 bytes each Packet given header with order of packet & checksum (based on amount of data) Each packet put into separate IP envelope, containing addressing information IP envelope header contains: Sender s address Destination address Length of time packet should be kept
18 As packets sent across Internet, routers examine IP envelope to find best route Packets arrive out of order. TCP calculates the checksum for each packet (error checking) and assembles packets into original form at destination Winsock software is intermediary between Internet and PC
19 To use TCP/IP To connect to the Internet and use TCP/IP Direct connection (LAN, cable modem, DSL needs network card and hardware driver) Dial up connection (Modem) Serial Line Internet Protocol (SLIP) Point-to-Point Protocol (PPP)
20 Internet Addresses and Domain Names Domain Name System (DNS) way computers contact each other E.g. to visit web site, type in address (URL): Numbers convenient for computers TCP/IP uses its DNS application to provide name-toaddress translation DNS translates English address into IP address like All computers connected to the Internet have an IP address defines location
21 IP Addresses Static IP Address manually assigned to a computer, never changes Dynamic IP Address automatically assigned by the server when you connect, usually using Dynamic Host Configuration Protocol (DHCP)
22 How Dynamic Address Obtained
23 Domains Major domains and minor domains: is the major domain.dcu is Dublin City University domain.computing is School of Computing server
24 Domain names Some U.S. domain names:.edu educational establishment.com commercial business.gov government etc. etc. Country domain names:.ie Ireland.uk United Kingdom.de Germany.za South Africa etc. etc.
25 Network Size Class A addresses for large networks with many devices Class B addresses for medium-sized networks Class C addresses for small networks (fewer than 256 devices)
26 IP address and Network size IP address in two parts Part 1 identifies network Part 2 identifies node (host or actual computer) IP address expressed as four eight-bit numbers, separated by periods. Example: Class A address range: Class B address range: Class C address range:
27 URL (Uniform Resource Locator) URL s identify each file on the web: tells the browser the protocol is hypertext transfer protocol rules by which the document is transferred. is host name Follow host name with path to directory teaching.html is the file holding the document
28 Routers Traffic cops of the Internet. Get data to destination via most efficient route Check IP envelopes for destination address Calculate best route and sends package Router sends packet to another router (closer to destination), which sends to another.. Router considers Traffic congestion Number of hops
29 Routers Routers have two or more physical ports Input port (routing process run, routing table) Output port (results from routing, defines route packets should follow) Input queue (holding area for input) Routing table Static specifies specific routes Dynamic can have multiple routes Routing protocols Interior Interior Gateway Routing Protocol(IGRP)) Exterior (Exterior Gateway Protocol (EGP), now replaced by Border Gateway Protocol (BGP))
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