350-601 Network Practice Question
Which THREE conditions must be met for a Cisco Nexus switch to form a vPC? (Choose three.)
⚠ Common exam trap
Cisco often tests the misconception that the peer-keepalive link must traverse the peer-link, when in fact it must be a separate Layer 3 path to avoid a single point of failure for vPC health monitoring.
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
✓
Both switches must run the same NX-OS software version
Cisco vPC requires both peer switches to run the same NX-OS software version to ensure consistent feature support, protocol behavior, and configuration syntax. Version mismatches can lead to unexpected failures, such as the vPC not forming or inconsistent forwarding states across the peer-link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both switches must use the same routing protocol
Why it's wrong here
Routing protocols can differ; vPC does not mandate same routing protocol.
- ✗
The peer-keepalive link must be carried over the peer-link
Why it's wrong here
Peer-keepalive must be a separate L3 link, not over the peer-link.
- ✓
Both switches must run the same NX-OS software version
Why this is correct
Same version ensures feature compatibility and stability.
- ✓
A dedicated peer-link port-channel must be configured
Why this is correct
The peer-link is a required port-channel for vPC control and data traffic.
- ✓
The vPC domain ID must be identical on both switches
Why this is correct
Domain ID must match for vPC to form.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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