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300-410 Practice Question: By default in Cisco IOS-XE, what is the behavior…
By default in Cisco IOS-XE, what is the behavior of an IPv4 ACL when no entries match and the ACL is applied to an inbound interface?
⚠ Common exam trap
Cisco often tests the implicit deny any behavior by presenting scenarios where an ACL has no matching entries, leading candidates to mistakenly think the packet is permitted or forwarded based on routing.
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, Cisco IOS-XE applies an implicit 'deny any' statement at the end of every IPv4 ACL. If no entries match the packet, the implicit deny triggers, and the packet is dropped. This behavior is consistent for ACLs applied to inbound interfaces, 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
The implicit deny all causes unmatched packets to be dropped.
- ✓
The packet is denied.
Why this is correct
The implicit deny all at the end of every IPv4 ACL denies unmatched traffic.
- ✗
The packet is forwarded based on routing table lookup.
Why it's wrong here
ACL processing occurs before routing; unmatched packets are denied.
- ✗
The ACL logs the packet and continues.
Why it's wrong here
No implicit logging exists; the packet is simply denied.
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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.