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CCIE Routing and Switching Exam Certification Guide

Chapter Description

Prepare for the CCIE Routing and Switching Exam with this excellent study resource. Review such topics as MAC address format, VLAN trunking, transparent bridge functions, and much more.

VLAN Trunking

  • ISL—Cisco's proprietary method of trunk encapsulation for carrying VLANs over FE and GE. You use the VLAN header and trailer outside the frame (external tag).

  • IEEE 802.1q—IEEE standard for trunk encapsulation for carrying VLANs over FE and GE. Uses internal 4-byte tag that is placed before the Type/Length field of frames.

  • VTP—Cisco's method of distributing VLAN information between Catalyst switches.

  • VLAN pruning—Limits the flooding of broadcasts to switches that do not require them.