Quick Answer
The correct answer is VLANs 1-100 only, as this is the default allowed VLAN list configured on a vPC peer-link trunk. This default behavior exists because the peer-link is designed to carry only data-plane traffic for VLANs 1 through 100, while the native VLAN is explicitly excluded to prevent loops and misconfigurations; instead, a dedicated control VLAN (typically VLAN 4094) handles all vPC keepalive and control-plane communication. On the Cisco DCCOR and CCNP Data Center Core 350-601 exam, this concept tests your understanding of vPC peer-link trunk defaults versus manual overrides—a common trap is assuming all VLANs or the native VLAN are allowed by default. Remember the memory tip: “Peer-link is picky—only one to one hundred, no native, no control.”
This 350-601 practice question tests your understanding of network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
interface port-channel1 description VPC Peer-Link switchport mode trunk switchport trunk allowed vlan 1-100 vpc peer-link
Refer to the exhibit. Which VLANs are allowed on the VPC peer-link?
interface port-channel1 description VPC Peer-Link switchport mode trunk switchport trunk allowed vlan 1-100 vpc peer-link
VLANs 1-100 and native VLAN
Why wrong: The native VLAN is not shown and not necessarily included.
Only VLAN 1
Why wrong: The range includes VLANs 1 through 100.
VLANs 1-100 only
The allowed VLAN range is 1-100.
All VLANs (1-4094)
Why wrong: The allowed list is restricted to 1-100.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
VLANs 1-100 only
In a vPC domain, the peer-link carries only specific VLANs that are allowed on the trunk. By default, the peer-link is configured as a trunk allowing VLANs 1-100, and the native VLAN is not included in this allowed list because the peer-link uses a dedicated VLAN for control traffic (typically VLAN 4094) and does not forward native VLAN traffic. Option C is correct because the default allowed VLAN list on a vPC peer-link is VLANs 1-100, as shown in the exhibit.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VLANs 1-100 and native VLAN
Why it's wrong here
The native VLAN is not shown and not necessarily included.
Only VLAN 1
Why it's wrong here
The range includes VLANs 1 through 100.
VLANs 1-100 only
Why this is correct
The allowed VLAN range is 1-100.
Related concept
Read the scenario before looking for a memorised answer.
All VLANs (1-4094)
Why it's wrong here
The allowed list is restricted to 1-100.
Common exam traps
Cisco often tests the misconception that the vPC peer-link allows all VLANs or includes the native VLAN, when in fact it defaults to VLANs 1-100 and explicitly excludes the native VLAN to maintain control plane isolation.
Trap categories for this question
Command / output trap
The native VLAN is not shown and not necessarily included.
Detailed technical explanation
The vPC peer-link is a special trunk that carries only the VLANs necessary for vPC operation and data forwarding. By default, the allowed VLAN list is 1-100, but this can be modified with the 'vpc peer-link' command under the interface. The peer-link also uses a dedicated VLAN (typically 4094) for vPC keepalive and control messages, which is not part of the allowed VLAN list. In real-world scenarios, administrators often prune the allowed VLAN list to only those VLANs that require vPC load balancing, reducing control plane overhead.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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FAQ
Network — This question tests Network — Read the scenario before looking for a memorised answer..
The correct answer is: VLANs 1-100 only — In a vPC domain, the peer-link carries only specific VLANs that are allowed on the trunk. By default, the peer-link is configured as a trunk allowing VLANs 1-100, and the native VLAN is not included in this allowed list because the peer-link uses a dedicated VLAN for control traffic (typically VLAN 4094) and does not forward native VLAN traffic. Option C is correct because the default allowed VLAN list on a vPC peer-link is VLANs 1-100, as shown in the exhibit.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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