350-601 Network Practice Question
In a vPC environment, which two conditions must be identical on both vPC peer switches to ensure proper consistency? (Choose two.)
⚠ Common exam trap
Cisco often tests the misconception that all vPC parameters must match, but only specific ones (like VLAN configuration and STP port type) are required to be identical for consistency, while others like system priority or peer-keepalive IP are intentionally different.
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
✓
VLAN configuration on the member ports
In a vPC environment, the VLAN configuration on member ports must be identical on both peer switches to ensure that traffic is forwarded consistently across the vPC. If VLANs are pruned or allowed differently on the member ports, the vPC can become inconsistent, leading to traffic drops or loops. This is a key consistency check enforced by Cisco NX-OS to maintain a stable vPC domain.
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.
- ✗
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).
- ✓
STP port type (edge, network, normal)
Why this is correct
STP port type must match for consistency.
- ✗
Peer-keepalive IP address
Why it's wrong here
Peer-keepalive IPs are unique per switch.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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