lecture2 - CS4700/CS5700 Fundamentals of Computer...

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Unformatted text preview: CS4700/CS5700 Fundamentals of Computer Networking Prof. Alan Mislove Lecture 2: Overview Slides adapted with permission from Eugene Ng, Rice COMP 413 September 10th, 2009 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove What is a network? 2 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove What is a network? Wikipedia: A telecommunications network is a network of telecommunications links and nodes arranged so that messages may be passed from one part of the network to another over multiple links and through various nodes. What are messages? Information 2 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove Why is networking interesting? or, why am I here? Many people use it, few understand Scale Billions of users, thousands of apps, millions of end hosts Complexity Many functions, many technologies, complex structure Distribution Shared, no central coordination point, independent agents 3 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove History of networks or, how did we get here? Communication Telecommunication Telecommunication networks Computer networks Convergence networks 4 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove Long distance communication Letters by messenger Physical objects Limited speed, reliability, security Eventually, postal services Other communication tools Optical (fire) Auditory (drums, etc) Problems? 5 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove Telegraph: Electronic communication In US, telegraph invented in 1837 by Samuel Morse 10 miles at 10 words/minute Simple circuit Send signals by making/breaking the connection Could (almost) instantly transmit information Telegraph in-use until 1985! 6 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove Engineering the telegraph How to encode information? feed in/output information? improve distance? improve speed (bandwidth)? Issues faced by all communication systems 7 10.09.2009 CS4700/CS5700 Lecture 2 Alan Mislove Example: Encoding information How to convert messages to electrical signals?...
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This note was uploaded on 03/04/2011 for the course CS 4700 taught by Professor Mislove during the Spring '11 term at Northeastern.

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lecture2 - CS4700/CS5700 Fundamentals of Computer...

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