Media Access Control

Media Access Control


Reading: Peterson and Davie,
Chapter 2



Computer Science 3N03/4C03 Winter 2023 1

,Internet Protocols

Application
Application
Presentation software
Session

Transport Reliability
Kernel software
(device driver)
Network Routing

Framing, error detection, medium
Data Link access control, Reliability Hardware (network
adapter)
Physical Encoding, modulation


Computer Science 3N03/4C03 Winter 2023 2

, Multiple Access Media

 Multiple senders on some media Bus Topology: Shared
Ethernet, Token Bus
 Buses (Ethernet)
 Wireless, Satellite
 Token Ring
Wireless: Shared
IEEE 802.11
 Need methods to mediate access
 Fair arbitration
 Good performance

Computer Science 3N03/4C03 Winter 2023 Ring Topology: Multihop 3

FDDI, IEEE 802.5

, Question

 Why we don’t adopt fully
connected network topology as
LAN topology?

 No need for packet switching, but
the number of connections grows
quadratically with the number of
nodes. So it is impractical.




Computer Science 3N03/4C03 Winter 2023 4