csce201-lect8.2

csce201-lect8.2 - CSCE 201 Computer Networks CSCE 201 -...

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CSCE 201 - Farkas 1 CSCE 201 CSCE 201 Computer Networks Computer Networks
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CSCE 201 - Farkas 2 Reading Assignment Reading Assignment Required: Security Awareness: Chapter 3 Recommended: Internet Society (ISOC) homepage, http://www.isoc.org Computer Network, http://en.wikipedia.org/wiki/Computer_network Easttom: Chapter 2
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CSCE 201 - Farkas 3 Before Internet Before Internet Isolated, local packet-switching networks only nodes on the same network could communicate Each network is autonomous: different services different interfaces different protocols
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CSCE 201 - Farkas 4 Before Internet (cont) Before Internet (cont) ARPANET: sponsored by Defense Advanced Research Projects Agency (DARPA): 1969: interconnected 4 hosts 1970: host-to-host protocol: Network Control Protocol (NCP) 1972: first application: e-mail Univ. of California at LA (UCLA) Stanford Research Institute (SRI) Univ. of California at Santa Barbara (UCSB) Univ. of Utah
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CSCE 201 - Farkas 5 Internet Internet Connect Existing Networks: ARPANET, Packet Radio, and Packet Satellite NCP not sufficient Develop new protocol 1970s: Transmission Control Protocol (Kahn and Vinton) Based on packet switching technology Good for file transfer and remote terminal access Divide TCP into 2 protocols Internet Protocol (IP): addressing and forwarding of packets Transmission Control Protocol (TCP): sophisticated services, e.g. flow control, recovery 1980: TCP/IP adopted as a DoD standard 1983: ARPANET protocol officially changed from NCP to TCP/IP 1985: Existing Internet technology 1995: U.S. Federal Networking Council (FNC) define the term Internet
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CSCE 201 - Farkas 6 Goals (Clark’88) Goals (Clark’88) Connect existing networks 1. Survivability 2. Support multiple types of services 3. Must accommodate a variety of networks 4. Allow distributed management 5. Allow host attachment with a low level of effort 6. Be cost effective 7. Allow resource accountability
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CSCE 201 - Farkas 7 Internet Challenge
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csce201-lect8.2 - CSCE 201 Computer Networks CSCE 201 -...

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