This 300-410 practice question tests your understanding of ipv4 access control lists. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command to troubleshoot an IPv4 Access Control Lists issue:
R1# show ip access-lists 130
Extended IP access list 130
10 deny ip host 10.1.1.1 host 10.2.2.2
20 permit ip any anyThen the engineer runs:
R1# debug ip packet 130 IP packet debugging is on for access list 130 *Mar 1 00:20:10.123: IP: s=10.1.1.1 (GigabitEthernet0/0), d=10.2.2.2, len 100, proto ICMP, access list 130: matched line 10 deny ip host 10.1.1.1 host 10.2.2.2
What does this output indicate?
ICMP traffic from 10.1.1.1 to 10.2.2.2 is being denied by ACL 130.
The debug shows the match on the deny line.
ICMP traffic from 10.1.1.1 to 10.2.2.2 is being permitted by ACL 130.
Why wrong: It matches a deny line.
ACL 130 is applied outbound on GigabitEthernet0/0.
Why wrong: Direction is not indicated.
ACL 130 is not matching any packets.
Why wrong: The debug shows a match.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ICMP traffic from 10.1.1.1 to 10.2.2.2 is being denied by ACL 130.
The debug output explicitly shows that the packet with source 10.1.1.1 and destination 10.2.2.2 matched line 10 of ACL 130, which is a deny statement. Since the ACL is evaluated sequentially and the first match is a deny, the ICMP traffic is denied. The debug message confirms the match, so option A is correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ICMP traffic from 10.1.1.1 to 10.2.2.2 is being denied by ACL 130.
Why this is correct
The debug shows the match on the deny line.
Related concept
Read the scenario before looking for a memorised answer.
ICMP traffic from 10.1.1.1 to 10.2.2.2 is being permitted by ACL 130.
Why it's wrong here
It matches a deny line.
ACL 130 is applied outbound on GigabitEthernet0/0.
Why it's wrong here
Direction is not indicated.
ACL 130 is not matching any packets.
Why it's wrong here
The debug shows a match.
Common exam traps
Cisco often tests the misconception that a debug message showing a packet matched an ACL line implies the packet was permitted, when in fact the action (deny or permit) is determined by the matched line's action.
Trap categories for this question
Command / output trap
The debug shows a match.
Detailed technical explanation
When 'debug ip packet' is used with an ACL number, it filters the debug output to only show packets that match that ACL. The ACL is evaluated in order; once a match is found (line 10 deny), the packet is denied and no further lines are checked. In real-world scenarios, this debug is invaluable for verifying ACL behavior, but it can be CPU-intensive on production routers, so it should be used with caution and only for targeted troubleshooting.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
IPv4 Access Control Lists — This question tests IPv4 Access Control Lists — Read the scenario before looking for a memorised answer..
The correct answer is: ICMP traffic from 10.1.1.1 to 10.2.2.2 is being denied by ACL 130. — The debug output explicitly shows that the packet with source 10.1.1.1 and destination 10.2.2.2 matched line 10 of ACL 130, which is a deny statement. Since the ACL is evaluated sequentially and the first match is a deny, the ICMP traffic is denied. The debug message confirms the match, so option A is correct.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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