1. Chapter 12
Local Area Networks
• Project 802
• Ethernet
• Token Ring
• FDDI
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2. Figure 12-1
OSI Model and Project 802
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3. Logical Link Control (LLC) provides single data link
control protocol for all IEEE LANs while Media Access
Control (MAC) provides different protocols for different
LANs.
MAC contains synchronization, flag, flow and error
control specifications necessary to move information from
one place to another and the physical address of the next
station to reduce and route a packet.

4. Figure 12-2
Project 802
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5. Figure 12-3
PROTOCOL DATA UNIT(PDU)
Format
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6. Figure 12-4
PDU Control Field
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7. Figure 12-5
ETHERNET
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8. Figure 12-6
Evolution of CSMA/CD
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9. Figure 12-7
MAC Frame
PDU can be from 46 to 1500 bytes
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10. Figure 12-8
10BASE5- THICK ETHERNET
LAN Topology, Baseband signal, maximum segment length
500meters
Ethernet Segments
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11. Figure 12-9
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12. Figure 12-9-continued
10BASE5-THICK ETHETNRT
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13. Figure 12-10
Transceiver connection in 10Base5
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14. Figure 12-11
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15. Figure 12-11-continued
10BASE2-THIN ETHERNET
LAN Topology, reduced cost, easy installation.
Shorter range, less capacity.
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16. Figure 12-12
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17. Figure 12-12-continued
10BASET
Star topology LAN, maximum length 100meters
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18. Figure 12-13
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19. Figure 12-13-continued
1BASE5
Star topology
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20. Figure 12-14
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21. Figure 12-15
Token Passing
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22. Figure 12-15-continued
Token Passing
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23. Figure 12-15-continued
Token Passing
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24. Figure 12-15-continued
Token Passing
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25. Figure 12-16
Token Ring Frame
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26. Figure 12-17
Data Frame Fields
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27. Figure 12-17-continued
Data Frame Fields
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28. Figure 12-18
Token Ring
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29. Figure 12-19
Token Ring Switch
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30. Figure 12-20
MAU
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31. Figure 12-21
FDDI
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32. Figure 12-22
FDDI Example
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33. Figure 12-22-continued
FDDI Example
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34. Figure 12-23
FDDI Encoding
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35. Figure 12-24
FDDI Layers
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36. Figure 12-25
FDDI Frames
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37. Figure 12-26
FDDI Rings
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38. Figure 12-27
FDDI Ring Failure
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39. Figure 12-28
FDDI Nodes
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