Cisco 100-105 Exam

Which method does a connected trunk port use to tag VLAN traffic?

  • A. IEEE 802.1w
  • B. IEEE 802.1D
  • C. IEEE 802.1Q
  • D. IEEE 802.1p
Answer: Option C.
Explanation: 

IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet network. When a frame enters the VLAN-aware portion of the network
(a trunk link, for example), a VLAN ID tag is added to represent the VLAN membership of that frame. The picture below shows how VLAN tag is added and removed while going through the network. http://www.cisco.com/c/en/us/support/docs/lan-switching/8021q/17056-741-4.html

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