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

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.