350-601 Network Practice Question
Which statement is true about the VLANs carried on a VPC peer-link?
⚠ Common exam trap
Cisco often tests the misconception that the peer-link only carries VLANs present on member ports, when in fact it must carry all VLANs allowed on the trunk to support orphan port traffic and maintain vPC loop-free operation.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The peer-link carries all VLANs that are allowed on the trunk interface.
In a vPC domain, the peer-link is a special trunk that carries all VLANs allowed on the trunk interface, including those not present on any member port. This ensures that orphaned traffic (traffic arriving on the peer-link destined for a device connected to the other vPC peer) can be forwarded correctly. The peer-link must carry all VLANs to maintain Layer 2 connectivity and loop-free behavior without relying on spanning tree.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The peer-link carries only the VLANs allowed on the member interfaces.
Why it's wrong here
The peer-link's allowed VLANs are configured separately.
- ✓
The peer-link carries all VLANs that are allowed on the trunk interface.
Why this is correct
The peer-link is a trunk that can carry any VLAN allowed on it.
- ✗
The peer-link requires spanning-tree port type edge trunk configuration.
Why it's wrong here
This is optional, not required.
- ✗
The peer-link must be configured as a layer 3 interface.
Why it's wrong here
The peer-link is a layer 2 trunk.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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