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300-410 Practice Question: Which THREE symptoms indicate that an IPv4 access…
Which THREE symptoms indicate that an IPv4 access control list may be misconfigured or not applied correctly? (Choose THREE.)
⚠ Common exam trap
Cisco often tests the distinction between direct symptoms of ACL misconfiguration (blocking permitted traffic, no hit counts, high CPU) and indirect or unrelated issues (interface flapping, neighbor drops) that candidates might incorrectly associate with ACLs due to a superficial understanding of ACL behavior.
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
✓
Traffic that should be permitted is being blocked.
A primary symptom of a misconfigured or incorrectly applied ACL is that it blocks traffic that should be permitted. This typically occurs when the ACL's sequence of permit and deny statements does not match the intended policy, or when the ACL is applied in the wrong direction (inbound vs. outbound) on an interface. The router processes ACL entries sequentially, so a deny statement placed before a permit statement for the same traffic will cause legitimate packets to be dropped.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Traffic that should be permitted is being blocked.
Why this is correct
This indicates the ACL may have an incorrect deny statement or order.
- ✗
The interface is flapping up and down.
Why it's wrong here
Interface flapping is usually due to physical or Layer 2 issues, not ACLs.
- ✓
High CPU utilization on the router due to ACL processing.
Why this is correct
Inefficient or large ACLs can cause high CPU, especially with logging enabled.
- ✓
ACL hit counts are not incrementing for expected traffic.
Why this is correct
This suggests the ACL may not be applied to the correct interface or direction.
- ✗
Routing protocol neighbors are dropping.
Why it's wrong here
Neighbor drops are usually due to protocol timers, authentication, or MTU issues, not ACLs.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco 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 300-410 exam.