Lecture 5 6

Lecture 5 6 - EE 555 Spring 2009 Broadband Network...

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EE 555 Spring 2009 Broadband Network Architectures 1. Key Issues in Networking and Network Architecture Network Architecture 1 3 Internet Architecture 1.3 Internet Architecture Development Prof John Silveste Prof. John Silvester Packe -Switching Network Packet Switching Networks • Basic technology the same as in the 1970s One of the few effective technologies for long distance data communications • Advantages: – flexibility, resource sharing, robust, responsive • Disadvantages: – Time delays in distributed network, overhead penalties – Need for routing and congestion control • Frame relay and ATM are variants of packet-switching • MPLS extends the frame relay concept for use over packet networks usc-den-ee555-200901-silvester section 1.3 1.3.2
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Packet Switching Technique • Large messages broken up into smaller packets • Datagram – Each packet sent independently of the others – No call setup – More reliable (can route around failed nodes or congestion) Virtual circuit – Fixed route established before any packets sent – No need for routing decision for each packet at each node (and then there are variations) • Tradeoff (set up time, ordering, resource allocation, …) usc-den-ee555-200901-silvester section 1.3 1.3.3 ARPAnet: 1969 • Initially a 4 node network • Grew to a nationwide backbone interconnecting major research universities 50 Kbps links • Link protocol HDLC family (error and flow control) • Separated the host computer from the special computer to handle communications (router) • One router per node – minicomputer (Interface Message Processors – IMP) • IP came from this network (not day 1) • ETE protocol TCP also developed in this network usc-den-ee555-200901-silvester section 1.3 1.3.4
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ARPAnet Topology usc-den-ee555-200901-silvester section 1.3 1-5 Separation of Communication Functionality R1 R3 R4 H1 H2 H4 R2 R5 H6 H5 Router or IMP H3 Network Host usc-den-ee555-200901-silvester section 1.3 1-6
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Architecture of the “Internet” Architecture of the Internet • How does it work? How does it work? • Protocol Architecture • Procedures to exchange data between devices can be complex • High degree of cooperation required between communicating systems usc-den-ee555-200901-silvester section 1.3 1.3.7 Example: File transfer Example: File transfer • Tasks
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This note was uploaded on 12/22/2010 for the course EE 555 taught by Professor Silvester during the Fall '08 term at USC.

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Lecture 5 6 - EE 555 Spring 2009 Broadband Network...

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