easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip access-lists
Extended IP access list 130
10 deny ip 192.168.1.0 0.0.0.255 any (0 matches)
20 permit ip any any (1000 matches)Based on this output, which statement is correct?
⚠ Common exam trap
Many exam-takers assume the deny statement is actively blocking traffic based on its configuration, ignoring the match counters that reveal no packets have actually matched that line.
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 from 192.168.1.0/24 is being permitted.
The ACL processes packets sequentially: line 10 denies traffic from 192.168.1.0/24 but has 0 matches, meaning no packets from that source have been evaluated. Line 20 permits all other traffic and has 1000 matches, so traffic from 192.168.1.0/24 is implicitly permitted by the permit any any statement since it is never denied.
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 from 192.168.1.0/24 is being denied.
Why it's wrong here
Line 10 has 0 matches, so no traffic from that subnet has been denied yet.
- ✓
Traffic from 192.168.1.0/24 is being permitted.
Why this is correct
Since line 10 has no matches, traffic from that subnet is matched by line 20 (permit any any) and permitted.
- ✗
The ACL is blocking all traffic.
Why it's wrong here
Line 20 permits all traffic, and line 10 has no matches.
- ✗
The ACL is misconfigured because line 10 is not needed.
Why it's wrong here
The ACL may be intentional; 0 matches does not indicate misconfiguration.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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