Question 51 of 144
SK0-005 troubleshooting Practice Question
A server uses NIC teaming with LACP (802.3ad) for load balancing and failover. After replacing a failed switch with a new switch of the same model, the server loses network connectivity. The switch ports show no activity. Which of the following 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
✓
LACP is not enabled on the switch ports.
LACP must be explicitly enabled and configured on switch ports to form a port-channel (Option D). New switches ship with default configurations that do not include LACP. The server's NIC teaming mode (Option A) was previously working, so it is likely correct. Access port configuration (Option B) would affect VLAN membership but not completely drop traffic. Firmware differences (Option C) rarely cause total loss of connectivity without other configuration mismatches.
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 switch ports are not configured as access ports.
Why it's wrong here
If required, this could cause VLAN issues but would not usually result in zero activity on ports.
- ✗
The new switch has a different firmware version.
Why it's wrong here
Firmware differences alone are unlikely to cause complete lack of connectivity if the configuration is identical.
- ✗
The server's NIC teaming mode is set to active/passive.
Why it's wrong here
If it was working with the previous switch, the mode is compatible; active/passive would at least have one active link.
- ✓
LACP is not enabled on the switch ports.
Why this is correct
LACP requires configuration on the switch; default is no LACP, so the switch does not negotiate the port-channel, leading to no connectivity.
Visual reference
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Last reviewed: Jul 26, 2026
This SK0-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SK0-005 exam.
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