{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 5 6

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

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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 Silvester Prof. John Silvester Packet-Switching Networks Packet Switching Networks Basic technology the same as in the 1970s O f th f ff ti t h l i f l di t One of the few effective technologies for long distance data communications Advantages: fl ibilit h i b t i flexibility, resource sharing, robust, responsive Disadvantages: Time delays in distributed network, overhead penalties N d f ti d ti t l 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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 ( d th th i ti ) (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) 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
Image of page 2
ARPAnet Topology usc-den-ee555-200901-silvester section 1.3 1-5 Separation of Communication Functionality H1 R1 R3 R4 H2 H4 H5 R2 R5 H6 Router or IMP H3 Network Host usc-den-ee555-200901-silvester section 1.3 1-6
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Architecture of the “Internet” Architecture of the Internet • How does it work? How does it work? Protocol Architecture P d t h d t b t 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:
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '08
  • Silvester
  • Flow control, Transmission Control Protocol, Internet Protocol Suite, usc-den-ee555-200901-silvester section

{[ snackBarMessage ]}