1. 1 3/13/2016 15:25 Chapter 5Protocol Architecture1 Rivier College CS575: Advanced LANs Chapter 5: Protocol Architecture

2. 2 3/13/2016 15:25 Chapter 5Protocol Architecture2 IEEE 802 Protocol Layers Compared to OSI Model

3. 3 3/13/2016 15:25 Chapter 5Protocol Architecture3 Scope of LAN Protocols

4. 4 3/13/2016 15:25 Chapter 5Protocol Architecture4 Logical Link Control (LLC) Scenario

5. 5 3/13/2016 15:25 Chapter 5Protocol Architecture5 User Data and LAN/MAN Protocol Control Information

6. 6 3/13/2016 15:25 Chapter 5Protocol Architecture6 Generic MAC Frame Format

7. 7 3/13/2016 15:25 Chapter 5Protocol Architecture7 LAN Protocols in Context

8. 8 3/13/2016 15:25 Chapter 5Protocol Architecture8 Bridges 0 For interconnection of LANs that use identical protocols at the MAC layer (IEEE 802.3, FDDI) 0 Few reasons for using the bridges: -Reliability (the network can be partitioned into self-contained units) -Improve performance -Improve security of communications by allowing different types of traffic (e.g., accounting, personnel, strategic planning) and different types of users with different levels of security -Establish controlled and monitored mechanisms of communication -Geography

9. 9 3/13/2016 15:25 Chapter 5Protocol Architecture9 Bridge Operation

10. 10 3/13/2016 15:25 Chapter 5Protocol Architecture10 Protocol Architecture for Bridge

11. 11 3/13/2016 15:25 Chapter 5Protocol Architecture11 Routers 0 Router connects dissimilar networks and operates at layer 3 of the OSI model 0 Differences among networks include the following: -Addressing schemes (e.g., IEEE 802 LAN uses either 16-bit or 48-bit binary addresses for each attached device; an X.25 public frame-switching network uses 12-digit decimal addresses [encoded as 4-bit per digit for a 48-bit address]) -Maximum frame sizes (e.g., Ethernet imposes 1500-byte frame; X.25 – 1000-byte frame) -Interfaces (the concept of a router is independent of interfaces) -Reliability

12. 12 3/13/2016 15:25 Chapter 5Protocol Architecture12 Protocol Architecture for Router

13. 13 3/13/2016 15:25 Chapter 5Protocol Architecture13 Networking Devices

14. 14 3/13/2016 15:25 Chapter 5Protocol Architecture14 IEEE 802 Protocol Layers Compared to OSI Model

15. 15 3/13/2016 15:25 Chapter 5Protocol Architecture15 Organization of IEEE 802 0 802.1 High Layer LAN Protocols Working Group 0 802.2 Logical Link Control (LLC) Working Group 0 802.3 Ethernet Working Group: CSMA/CD (Ethernet) 0 802.4 Token Bus Working Group 0 802.5 Token Ring Working Group 0 802.6 Metropolitan Area Network Working Group 0 802.7 Broadband Technical Advisory Group (TAG) 0 802.8 Fiber Optic Technical Advisory Group (TAG) 0 802.9 Isochronous LAN Working Group 0 802.10 Security Working Group 0 802.11 Wireless LAN Working Group 0 802.12 Demand Priority Working Group (100VG-AnyLAN) 0 802.14 Cable Modem Working Group 0 802.15 Wireless Personal Area Networks Working Group 0 802.16 Broadband Wireless Access Study Group

16. 16 3/13/2016 15:25 Chapter 5Protocol Architecture16 Effectiveness of the Cycle Redundancy Check (CRC) * Error-detection technique requires an Error-Detecting Code (e.g., CRC)