A network administrator recently updated configurations on a Layer 3 switch. Following the updates, users report being unable to reach a specific file server. Which of the following is the most…

The correct answer is A. Incorrect ACLs. Since this issue occurred after a configuration change on a Layer 3 switch, the most likely cause is misconfigured ACLs (Access Control Lists). ACLs control which traffic is allowed or denied, so an incorrect ACL may be blocking access to the file server.

Submitted by diego_uy· Mar 6, 2026Network troubleshooting

Question

A network administrator recently updated configurations on a Layer 3 switch. Following the updates, users report being unable to reach a specific file server. Which of the following is the most likely cause?

Options

AIncorrect ACLs
BSwitching loop
CDuplicate IP addresses
DWrong default route

How the community answered

(47 responses)

A
72% (34)
B
9% (4)
C
17% (8)
D
2% (1)

Explanation

Since this issue occurred after a configuration change on a Layer 3 switch, the most likely cause is misconfigured ACLs (Access Control Lists). ACLs control which traffic is allowed or denied, so an incorrect ACL may be blocking access to the file server.

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