350-601 Practice Question: In a vPC environment, which two conditions must…
This 350-601 practice question tests your understanding of 350-601 exam topics. 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.
In a vPC environment, which two conditions must be identical on both vPC peer switches to ensure proper consistency? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VLAN configuration on the member ports
vPC consistency checks ensure that both peers have identical configurations for vPC member ports. Key parameters that must match include VLANs allowed on the port channel, STP settings (e.g., port type), MTU, and spanning-tree port settings. Port channel mode must be 'on' (no LACP) or LACP active/passive must match; typically both sides use the same mode. The peer-keepalive IP addresses are different because they are on different switches.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
VLAN configuration on the member ports
Why this is correct
Allowed VLANs must match.
Related concept
Access ports place end devices into a single VLAN.
✗
System priority
Why it's wrong here
System priority is used for vPC role election, not consistency check.
✗
Port channel mode (active/passive)
Why it's wrong here
Both sides must use a compatible mode, but it is not a consistency parameter that must be identical (e.g., active/active works).
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
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.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: VLAN configuration on the member ports — vPC consistency checks ensure that both peers have identical configurations for vPC member ports. Key parameters that must match include VLANs allowed on the port channel, STP settings (e.g., port type), MTU, and spanning-tree port settings. Port channel mode must be 'on' (no LACP) or LACP active/passive must match; typically both sides use the same mode. The peer-keepalive IP addresses are different because they are on different switches.
What should I do if I get this 350-601 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-601 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Question Discussion
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