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300-410 Practice Question: Runs the following command to debug NAT with…
A network engineer runs the following command to debug NAT with access lists:
R1# debug ip nat access-list 100
NAT: access list 100 matched ip 10.1.1.1 -> 192.168.1.1 NAT: access list 100 matched ip 10.1.1.2 -> 192.168.1.1 NAT: access list 100 matched ip 10.1.1.3 -> 192.168.1.1 NAT: access list 100 matched ip 10.1.1.4 -> 192.168.1.1
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that 'matched' in NAT debug output means the ACL is blocking traffic, when in fact 'matched' indicates the ACL permitted the traffic for translation.
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 access list is correctly matching traffic for NAT.
The debug output shows that access list 100 is matching traffic from inside local addresses (10.1.1.1-4) to the inside global address (192.168.1.1). This indicates the ACL is correctly identifying traffic for NAT translation, which is the first step in the NAT process. The 'matched' messages confirm that the ACL is permitting the traffic, not blocking it, so NAT can proceed to create translations.
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 access list is correctly matching traffic for NAT.
Why this is correct
The debug confirms the access list is being hit by traffic.
- ✗
NAT is failing because translations are not being created.
Why it's wrong here
The debug only shows matching; translations may still be created.
- ✗
The access list is misconfigured and blocking traffic.
Why it's wrong here
The debug shows matches, not blocks.
- ✗
The inside interface is not configured.
Why it's wrong here
No interface information is shown.
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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.