VCP-DCV Configure and Manage vSphere Networking Practice Question
After upgrading the physical switches, the LAG (Link Aggregation Group) on a VDS does not come up. The VDS LAG configuration shows LACP active mode. The physical switch ports are configured with LACP active mode as well. What is the most likely cause?
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 physical switch ports are not in a port-channel
For a LAG to form, the physical switch ports must be configured as a port-channel or etherchannel. Even if both sides are set to LACP active, the switch ports must first be grouped into a port-channel interface; otherwise, LACP negotiations will not complete. Option A is incorrect because the system priority affects LACP role but does not prevent LAG formation if both sides are active. Option C is incorrect because LAG IDs are not relevant across hosts; each host's LAG is independent. Option D is incorrect because the hashing algorithm does not affect LACP negotiation; it only affects load distribution.
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 physical switch uses a different LACP system priority
Why it's wrong here
System priority is used to determine which side decides aggregation; mismatch can cause issues but is less likely than missing port-channel configuration.
- ✓
The physical switch ports are not in a port-channel
Why this is correct
LACP requires the physical switch ports to be configured as part of a port-channel group; otherwise, they are treated as individual links and LACP will not form.
- ✗
The ESXi hosts have different LAG IDs
Why it's wrong here
LAG IDs are per host; each host must have its own LAG, but IDs don't need to match across hosts for the LAG to work on each host.
- ✗
The VDS LAG hashing algorithm is set to IP hash
Why it's wrong here
The hashing algorithm affects load distribution, not the ability to form a LAG.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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