October 2009
Intermediate to advanced
576 pages
21h 42m
English
book
Network Maintenance and Troubleshooting Guide: Field-Tested Solutions for Everyday Problems, Second Editon
by Neal Allen
Content preview from Network Maintenance and Troubleshooting Guide: Field-Tested Solutions for Everyday Problems, Second Editon
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Chapter 5. Data Link Layer
The Data Link Layer is usually depicted as having two sublayers: Media Access Control (MAC) and Logical Link Control (LLC), though additional sublayers are becoming more common (see Figure 5-1). The Media Access Control sublayer was described in the preceding chapter on Ethernet, and is the lowest sublayer. Above the MAC Layer is an increasingly more common (optional) MAC Control sublayer. If the MAC Layer for the interface is capable, then another optional sublayer called Operations, Administration, and Maintenance (OAM) may be used. OAM was added to Ethernet in conjunction with Ethernet in the First Mile (EFM) implementations in 802.3 Clauses 56–67. The MAC, MAC Control, and OAM sublayers apply to a single interface. ...