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EE228a - Fall 2001 Communication Networks

EE228a - Fall 2001 Communication Networks. Prof. Jean Walrand Department of EECS University of California Berkeley. Course Objectives & Contents. Explain Internet and related networks Models and Evaluation Technology Links: ADSL, Cable Modem, Optical LANs: Ethernet Routers, Switches

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EE228a - Fall 2001 Communication Networks

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  1. EE228a - Fall 2001 Communication Networks Prof. Jean Walrand Department of EECS University of California Berkeley

  2. Course Objectives & Contents • Explain Internet and related networks • Models and Evaluation • Technology • Links: ADSL, Cable Modem, Optical • LANs: Ethernet • Routers, Switches • Protocols • Routing, Transport, Applications

  3. Organization • One lecture every week: W 2:30 – 4:30 • Grading: Quizzes: 30%, 2 Midterms: 30%, Project Report: 20%, Project Presentation: 20% • Instructor: • Prof. Jean Walrand; OH: M 11:00 – 12:00 • Web site: See Prof. Walrand’s home page

  4. Contents 8/29: How Internet Works 9/05: Ethernet, ATM, ADSL, Cable Modems 9/12: Models, Analysis, Simulation 9/19: Routing: OSPF, BGP, Ad Hoc, … 9/26: Transmission Control 10/03: Switching – Midterm 1 10/10: Optical Networks 10/17: Wireless Networks 10/24: Networks and Services Management – Midterm 2 10/31: TM, NP, SAN, etc. 11/07,11/14, 11/28: Student Presentations

  5. Introduction • Web • Voice over IP

  6. Web • Example • Locating Resource: DNS • Connection • End-to-end • Packets • Bits • Points to remember

  7. Web: Example • Click -> get page • page from localor remote computer • link:http://cnn.comspecifies - protocol (http) - location (cnn.com)

  8. Web: Example • Click -> get page • page from localor remote computer • link:http://cnn.comspecifies - protocol (http) - location (cnn.com)

  9. Web: Example • Click -> get page • page from localor remote computer • link:http://cnn.comspecifies - protocol (http) - location (cnn.com)

  10. Web: Locating Resource • cnn.com is the name of a computer (and, implicitly, of a file in that computer) • To find the address, the application uses a hierarchical directory service called theDomain Name System

  11. Web: Connection • The protocol (http) sets up a connection between the host and cnn.com to transfer the page • The connection transfers the page as a byte stream, without errors: pacing + error control

  12. Web: End-to-end • The byte stream flows from end to end across many links and switches: routing (+ addressing) • That stream is regulated and controlled by both ends: retransmission of erroneous or missing bytes; pacing

  13. Web: Packets • The network transports bytes grouped into packets • The packets are “self-contained” and routers handle them one by one • The end hosts worry about errors and pacing:Destination sends ACKsSource checks losses

  14. Web: Bits • Equipment in each node sends the packets as a string of bits • That equipment is not aware of the meaning of the bits

  15. Web: Points to remember • Separation of tasks • send bits on a link: transmitter/receiver [clock, modulation,…] • send packet on each hop [framing, error detection,…] • send packet end to end [addressing, routing] • pace transmissions [detect congestion] • retransmit erroneous or missing packets [acks, timeout] • find destination address from name [DNS] • Scalability • routers don’t know about connections • names and addresses are hierarchical

  16. Voice Over IP: VoIP • General Operations

  17. VoIP: General Operations • Gateways must reproduce the signaling and voice • Signaling: dialed digits, dial tone, ringing • Voice: Packetize and absorb delay jitter • Note: Routing problem

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