network

1. Chapter 4_2
The Medium Access Control
Sublayer

2. IEEE 802.x
• IEEE 802.1
• IEEE 802.2
• IEEE 802.3
• Ethernet is a family of computer
networking technologies for LAN.
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3. Definitions
• Segment
• Repeater
• Bridge
• Hub
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4. Switch
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5. Repeaters, Hubs, Bridges, Switches,
Routers and Gateways
(a) Which device is in which layer.
(b) Frames, packets, and headers.
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6. Repeaters, Hubs, Bridges, Switches,
Routers and Gateways (2)
(a) A hub. (b) A bridge. (c) a switch.
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7. Ethernet Cabling
The most common kinds of Ethernet cabling.
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8. Ethernet Cabling (2)
Three kinds of Ethernet cabling.
(a) 10Base5, (b) 10Base2, (c) 10Base-T. 8

9. Ethernet Cabling (4)
(a) Binary encoding, (b) Manchester encoding,
(c) Differential Manchester encoding. 9

10. Ethernet MAC Sublayer Protocol
Frame formats. IEEE 802.3.
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11. Ethernet MAC Sublayer Protocol (2)
Collision detection can take as long as 2t .
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12. Binary Exponential Backoff
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13. Ethernet Performance
Efficiency of Ethernet at 10 Mbps with 512-bit slot times.
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14. Fast Ethernet
The original fast Ethernet cabling.
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15. Gigabit Ethernet
(a) A two-station Ethernet. (b) A multistation Ethernet.
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16. IEEE 802.4
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17. IEEE 802.5
• It uses a special three-byte frame called a token
that travels around the ring.
• Initially used only in IBM computers.
• It was eventually standardized with protocol IEEE
802.5.
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