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 interface GigabitEthernet0/1 | include access list
Outgoing access list is 140 Inbound access list is not set
Then the engineer runs:
R1# show ip access-lists 140
Extended IP access list 140
10 deny icmp any any
20 permit ip any anyWhat does this output indicate?
ACL 140 is applied outbound on GigabitEthernet0/1, denying ICMP and permitting all other traffic.
The output shows the ACL and its entries.
ACL 140 is applied inbound on GigabitEthernet0/1, blocking ICMP.
Why wrong: It says 'Outgoing access list'.
ACL 140 is not applied to any interface.
Why wrong: It is applied outbound on GigabitEthernet0/1.
ACL 140 is applied both inbound and outbound.
Why wrong: Only outbound is set.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ACL 140 is applied outbound on GigabitEthernet0/1, denying ICMP and permitting all other traffic.
The output of 'show ip interface GigabitEthernet0/1 | include access list' shows 'Outgoing access list is 140', confirming ACL 140 is applied outbound on that interface. The ACL itself contains two entries: 'deny icmp any any' (sequence 10) and 'permit ip any any' (sequence 20). Because the permit ip any any entry matches all IP traffic, including ICMP, the deny icmp entry is effectively overridden for outbound traffic, but the ACL still processes the deny first; however, since the permit ip any any follows, all IP traffic (including ICMP) is permitted outbound. The correct interpretation is that ACL 140 is applied outbound, denying ICMP (though the permit overrides it) and permitting all other traffic.
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.
ACL 140 is applied outbound on GigabitEthernet0/1, denying ICMP and permitting all other traffic.
Why this is correct
The output shows the ACL and its entries.
Related concept
Read the scenario before looking for a memorised answer.
ACL 140 is applied inbound on GigabitEthernet0/1, blocking ICMP.
Why it's wrong here
It says 'Outgoing access list'.
ACL 140 is not applied to any interface.
Why it's wrong here
It is applied outbound on GigabitEthernet0/1.
ACL 140 is applied both inbound and outbound.
Why it's wrong here
Only outbound is set.
Common exam traps
Cisco often tests the misconception that 'permit ip any any' overrides all previous deny statements, but in reality, ACLs are processed top-down and the first matching entry determines the action, so the deny icmp entry still blocks ICMP despite the later permit all.
Detailed technical explanation
When an ACL is applied outbound, the router evaluates packets after the routing decision and before they exit the interface. The order of entries matters: the first match (sequence 10) denies ICMP, but the subsequent 'permit ip any any' (sequence 20) permits all IP traffic, including ICMP, because the router processes the ACL sequentially and stops at the first match; however, in this case, the deny icmp entry is matched first for ICMP packets, so they are denied, while all other IP traffic matches the permit entry. This demonstrates that a 'permit ip any any' does not override earlier deny entries for specific protocols; it only permits traffic that has not been matched by earlier entries.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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: ACL 140 is applied outbound on GigabitEthernet0/1, denying ICMP and permitting all other traffic. — The output of 'show ip interface GigabitEthernet0/1 | include access list' shows 'Outgoing access list is 140', confirming ACL 140 is applied outbound on that interface. The ACL itself contains two entries: 'deny icmp any any' (sequence 10) and 'permit ip any any' (sequence 20). Because the permit ip any any entry matches all IP traffic, including ICMP, the deny icmp entry is effectively overridden for outbound traffic, but the ACL still processes the deny first; however, since the permit ip any any follows, all IP traffic (including ICMP) is permitted outbound. The correct interpretation is that ACL 140 is applied outbound, denying ICMP (though the permit overrides it) and permitting all other traffic.
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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