Lec.01 - Prof. Abdelshakour Abuzneid Growth Of Computer...

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Prof. Abdelshakour Abuzneid
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Growth Of Computer Networking Internet started as a research project Today, internet reaches millions Data networks made telecommuting  available to individuals
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Complexity In Network Systems Networking is complex because multiple  technologies exist No simple and uniform technology for  networking concepts Look beyond the details and  concentrate on understanding concepts
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Organisation of the text Introduction Data transmission Packet transmission Internetworking Networking applications
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Resource Sharing The first networks were designed to share  large scale computational powers Advanced Research Project Agency(ARPA)  started investigating data networks Early internet emerged in 1970s at ARPA Became commercial success in the 1990s
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Growth Of The Internet Early research  prototype to a  global  communication  system year Millions of computers
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Probing the Internet Simplest probing tool :- ping Ex: ping  www.netbook.cs.purdue.edu Send a message and then waits for a response Reports computer is alive/not responding Options Specify packet size Compute round trip time Repeatedly send one message/sec until program  stops
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Interpreting a Ping Response Ping outputs Number of packets sent and receives Packets lost, and Min/avg/max round trip times Disadvantages Round trip times provides little information Cannot explain why time required is higher Output occurs only when computer responds  Sometimes fails because of network congestion Uses A diagnostic tool for network administrators Pinpoints failures quickly
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Tracing a Route Traceroute determines the intermediate  computers along the path to a remote  destination Ex: traceroute  www.netbook.cs.purdue.edu Provides more information than ping
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Transmission Media Computer  communication  involves encoding data  in form of energy Hardware devices  attached to the  computer performs the  the encoding and  decoding of data
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Copper Wires Primary medium to connect computers because Low resistance to electric current When wires placed close together in parallel, interference  takes place To minimize interference, networks use: Twisted pair Advantages Limits electromagnetic energy emission Prevents signals from other wires from interfering Plastic coated wires
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Copper Wires(cont.) Coaxial cable(coax) Single wire surrounded  by a heavier metal shield Provides barrier to  electromagnetic radiation More protection than  twisted pair Shielded twisted pair A pair of wires  surrounded by a metal  shield
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Optical fibers uses light to transport data Advantages Use of light eliminates interference Carries of pulse of light much farther Carries more information than wires Requires only a single fiber
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This note was uploaded on 01/20/2012 for the course EE 301 taught by Professor Ahmetçakar during the Spring '11 term at Gazi Üniversitesi.

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Lec.01 - Prof. Abdelshakour Abuzneid Growth Of Computer...

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