Ccna routing and Switching Complete Study Guide

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The IEEE Ethernet Data Link layer has two sublayers:

Media Access Control (MAC)    Defines how packets are placed on the media. Contention for 

media access is “first come/first served” access where everyone shares the same bandwidth—

hence the name. Physical addressing is defined here as well as logical topologies. What’s a 

logical topology? It’s the signal path through a physical topology. Line discipline, error notifi-

cation (but not correction), the ordered delivery of frames, and optional flow control can also 

be used at this sublayer.