Connected Trunk Port VLAN Tagging Methods

Connected Trunk Port VLAN Tagging Methods

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



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A. B. C. D.


The correct answer is C. IEEE 802 1Q.

A trunk port is a type of port on a network switch that is used to carry traffic between multiple VLANs. When a frame is sent over a trunk port, the switch needs to know which VLAN it belongs to so that it can forward it to the correct destination. To do this, the switch adds a VLAN tag to the frame, which includes information about the VLAN that the frame belongs to.

IEEE 802.1Q is the standard that defines how VLAN tags are added to Ethernet frames. It specifies a 4-byte tag that is added to the beginning of the frame's Ethernet header. This tag includes a 12-bit VLAN ID field that identifies the VLAN that the frame belongs to.

When a port is configured as a trunk port, it is set to carry traffic for multiple VLANs. As a result, it needs to add a VLAN tag to each frame that it sends out. This tagging process is done automatically by the switch using the IEEE 802.1Q standard.

IEEE 802.1w is the standard for rapid spanning tree protocol, which is used to prevent loops in a network. IEEE 802.1D is the standard for classic spanning tree protocol, which is an older protocol used for the same purpose. IEEE 802.1p is the standard for quality of service (QoS) prioritization. None of these standards are used to tag VLAN traffic on a trunk port.