lecture5 - Alan Mislove amislove at ccs.neu.edu...

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Unformatted text preview: Alan Mislove amislove at ccs.neu.edu Northeastern University 1 CS4700/CS5700 Fundaments of Computer Networks Lecture 5: Internet architecture Slides used with permissions from Edward W. Knightly, T. S. Eugene Ng, Ion Stoica, Hui Zhang Alan Mislove amislove at ccs.neu.edu Northeastern University 2 Organizing Network Functionality • Many kinds of networking functionality – e.g., encoding, framing, routing, addressing, reliability, etc. • Many different network styles and technologies – circuit-switched vs packet-switched, etc. – wireless vs wired vs optical, etc. • Many different applications – ftp, email, web, P2P, etc. • Network architecture – How should different pieces be organized? – How should different pieces interact? Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media HTTP Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media HTTP Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem • new application has to interface to all existing media – adding new application requires O(m) work, m = number of media • new media requires all existing applications be modified – adding new media requires O(a) work, a = number of applications SMTP SSH FTP Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem • new application has to interface to all existing media – adding new application requires O(m) work, m = number of media • new media requires all existing applications be modified – adding new media requires O(a) work, a = number of applications • total work in system O(ma) → eventually too much work to add apps/media • Application end points may not be on the same media! SMTP SSH FTP Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP Alan Mislove amislove at ccs.neu.edu Northeastern University 4 Solution: Indirection • Solution: introduce an intermediate layer that provides a single abstraction for various network technologies – O(1) work to add app/media – Indirection is an often used technique in computer science SMTP SSH NFS Coaxial cable Fiber optic Application Transmission Media Intermediate layer Alan Mislove...
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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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lecture5 - Alan Mislove amislove at ccs.neu.edu...

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