Cisco 200-125 Exam

In a switched environment, what does the IEEE 802.1Q standard describe?

  • A. the operation of VTP
  • B. a method of VLAN trunking
  • C. an approach to wireless LAN communication
  • D. the process for root bridge selection
  • E. VLAN pruning
Answer: Option B.
Explanation: 

A broadcast domain must sometimes exist on more than one switch in the network. To accomplish this, one switch must send frames to another switch and indicate which VLAN a particular frame belongs to. On Cisco switches, a trunk link is created to accomplish this VLAN identification. ISL and IEEE 802.1Q are different methods of putting a VLAN identifier in a Layer 2 frame. The IEEE 802.1Q protocol interconnects VLANs between multiple switches, routers, and servers.
With 802.1Q, a network administrator can define a VLAN topology to span multiple physical devices.
Cisco switches support IEEE 802.1Q for FastEthernet and Gigabit Ethernet interfaces. An 802.1Q trunk link provides VLAN identification by adding a 4-byte tag to an Ethernet Frame as it leaves a trunk port.

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