210-250 · Question #73
What is a trunk link used for?
The correct answer is A. To pass multiple virtual LANs. This question tests understanding of the purpose of IEEE 802.1Q trunk links in a switched network environment.
Question
What is a trunk link used for?
Options
- ATo pass multiple virtual LANs
- BTo connect more than two switches
- CTo enable Spanning Tree Protocol
- DTo encapsulate Layer 2 frames
How the community answered
(14 responses)- A86% (12)
- C7% (1)
- D7% (1)
Why each option
This question tests understanding of the purpose of IEEE 802.1Q trunk links in a switched network environment.
A trunk link uses IEEE 802.1Q tagging to carry traffic from multiple VLANs over a single physical link between switches, routers, or switch-to-router connections. Each frame is tagged with a VLAN ID so the receiving device knows which VLAN the traffic belongs to, enabling VLAN propagation across the network.
A trunk link is a point-to-point connection between exactly two devices - it does not inherently connect more than two switches simultaneously.
Spanning Tree Protocol (STP) operates independently of trunk links and is enabled per-port or per-VLAN to prevent loops, not configured by creating a trunk.
Encapsulating Layer 2 frames with 802.1Q tags is the mechanism used to implement trunking, but it is the method - not the purpose - of a trunk link.
Concept tested: IEEE 802.1Q VLAN trunk link purpose
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/8021q/17056-741-4.html
Topics
Community Discussion
No community discussion yet for this question.