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Chapter 2
Protocol Attributes
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OSI Layer 2: Data-Link Layer Protocols and
Applications
T
his section is dedicated to Layer 2 protocols and applications. It is a
very important section because it provides specific information on how the
Layer 2 protocols work. What better way to be able to troubleshoot a prob-
lem than by understanding the intricacies of the protocol in question?
This section covers the following Layer 2 protocols:
Ethernet/IEEE 802.3
Token Ring/IEEE 802.5
FDDI
PPP
SDLC
X.25
Frame Relay
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