Question 32 of 2,011
easyMultiple ChoiceObjective-mapped
300-410 Practice Question: The default behavior of an IPv4 access control…
What is the default behavior of an IPv4 access control list (ACL) when no explicit permit or deny statement matches a packet?
⚠ Common exam trap
Cisco often tests the misconception that an ACL with no matching entries will permit traffic by default, or that the ACL is simply ignored, when in fact the implicit deny any silently drops all unmatched packets.
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 packet is denied.
By default, IPv4 ACLs have an implicit deny any statement at the end. If a packet does not match any explicit permit or deny entry, the implicit deny any is applied, causing the packet to be dropped. This behavior is fundamental to ACL security, ensuring that only explicitly permitted traffic is allowed.
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 packet is permitted.
Why it's wrong here
Incorrect. The default is to deny traffic that does not match any entry.
- ✓
The packet is denied.
Why this is correct
Correct. All ACLs have an implicit deny any at the end.
- ✗
The packet is logged and then permitted.
Why it's wrong here
Incorrect. Logging is only done if the 'log' keyword is used, and the default action is deny.
- ✗
The ACL is ignored and the packet is forwarded.
Why it's wrong here
Incorrect. The ACL is always applied; unmatched packets are denied.
Visual reference
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.