Local-Area Networks and LAN Switching - CCIE Routing and Switching Exam Certification Guide - page 167

Process for a Station to Insert into the Token Ring
The process for a station to insert into the Token Ring follows five phases:
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Phase 0—Lobe media check

•

Phase 1—Physical insertion

•

Phase 2—Address verification

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Phase 3—Participation in ring poll

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Phase 4—Request initialization

Transparent Bridge Functions
Transparent bridges have three primary functions:
•

To learn the MAC addresses of all nodes and their associated port

•

To filter incoming frames whose destination MAC addresses are located on the same
incoming port

•

To forward incoming frames to the destination MAC through their associated port

WLAN Modes Table 4-16

WLAN Mode Description

Basic Service Set (BSS) Also known as Infrastructure mode; there is one Access Point.

Independent Basic Service
Set (IBSS)

Also known as Ad-hoc mode; there is no Access Point.

Extended Service Set There is more than one Access Point.

Transparent Bridge Modes

Table 4-17

Bridge Mode Description

Store-and-Forward Stores the entire frame and verifies the CRC before forwarding the frame. If a CRC

error is detected, the frame is discarded.

Cut-Through Forwards the frame just after it reads the destination MAC address without

performing a CRC check.

Transparent Bridge Port States
Each port of a transparent bridge exists in the following states:
•

Disabled —The port is inactive and does not participate in STP.