300-410 IPv4 Access Control Lists Practice Question
This 300-410 practice question tests your understanding of ipv4 access control lists. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 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)
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.
Option B is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates 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.
Detailed technical explanation
How to think about this question
Cisco ACLs use first-match logic: packets are compared against entries in order until a match occurs. The match counters (0 matches) indicate that no packet has matched line 10, which could be due to routing, interface placement, or lack of traffic from 192.168.1.0/24. In real-world scenarios, an ACL with a deny statement that never matches might be a placeholder for future policy or a result of misapplied interface direction (e.g., inbound vs. outbound).
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
IPv4 Access Control Lists — This question tests IPv4 Access Control Lists — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Traffic from 192.168.1.0/24 is being permitted. — Option B is correct because 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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