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Computer Architecture II: Specialized 0909.444.01/02 Fall 2001

Computer Architecture II: Specialized 0909.444.01/02 Fall 2001. Lecture 3 November 1, 2001. John L. Schmalzel Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall01/comparch2/. Plan. Data Processing & Data Communications Communications Networks

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Computer Architecture II: Specialized 0909.444.01/02 Fall 2001

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  1. Computer Architecture II: Specialized0909.444.01/02Fall 2001 Lecture 3November 1, 2001 John L. Schmalzel Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall01/comparch2/

  2. Plan • Data Processing & Data Communications • Communications Networks • Packet Switched Networks • Why are we interested in this? • What are we studying here? • Protocols & Protocol Architecture • OSI 7-Layer Protocol Architecture • TCP-IP Protocol Architecture

  3. Recall Router Router Communications Networking

  4. Recall Decode TDM: Circuit Switching Message 1 Quantize & Encode Message 2 Channel Message N Message 1 LPF Message 2 LPF Message N LPF

  5. Recall 3 H H 1 2 H 3 H H 1 2 H 3 H H 1 2 H Recall: Packet Switching Depacket-izing Message 1 Message 1 Depacket-izing Packetizing Message 2 Message 2 Message 3 Depacket-izing Message 3

  6. 2 2 H H Why are we studying this? ROUTER COM OS Memory • What? • Protocol • Data • Frequency

  7. Step 1: Step 2: Step 3: …….. …….. Step 1: Step 2: Step 3: …….. …….. Protocol Protocol Message Sender Receiver Medium Protocols

  8. A 3-Layer Protocol Architecture Files and file transfer commands Comm related messages Comm network Computer 1 Computer 2

  9. ASIDE 7 6 5 4 3 2 1 Application Presentation Session Transport Network Data Link Physical ISO OSI 7-Layer Model Please Do Not Touch Steve’s Pet Alligator !!!

  10. TCP-IP OSI Application Application Presentation User space Session Transport (host-to-host) Software Transport Internet Network Firmware Network Access Operating system Data Link Hardware Physical Physical TCP-IP Protocol Architecture

  11. Host B TCP App Y App X Host A TCP App Y App X IP Network access protocol #2 Physical IP Network access protocol #1 Physical TCP-IP Operation Example Port or Service access point (SAP) Logical connection (TCP) Global network address Subnetwork attachment point address Logical connection Router J Network 2 Network 1

  12. User Data Application Byte Stream TCP Segment IP Datagram Network Level Packet TCP header IP header Network header TCP-IP Protocol Packet

  13. IP Header 0 4 8 16 19 31 20 octets

  14. TCP Header 0 4 10 16 31 20 octets

  15. Summary

  16. References • William Stallings, Data and Computer Communications, 5th Edition, Prentice-Hall, 1997. • Jean Walrand, Communication Networks, 2nd Edition, WCB/McGraw-Hill, 1998.

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