lecture5 - CS4700/CS5700 Fundaments of Computer Networks...

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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
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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?
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Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media
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Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media HTTP
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Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Coaxial cable Fiber optic Application Transmission Media HTTP
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Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP
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Alan Mislove amislove at ccs.neu.edu Northeastern University 3 Problem SMTP SSH FTP Packet radio Coaxial cable Fiber optic Application Transmission Media HTTP
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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
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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
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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
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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
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