- A
Traffic matching line 10 is permitted and counted correctly.
Line 10 has 10 matches and is a permit statement, so traffic matching it is permitted.
- B
All traffic is permitted because line 40 has only 1 match.
Why wrong: Line 40 is a deny statement; its matches indicate traffic being denied, not permitted.
- C
Line 20 denies SSH traffic to host 10.1.1.1, and 5 packets matched.
Line 20 denies TCP port 22 (SSH) to host 10.1.1.1, with 5 matches.
- D
The ACL has no effect because it is not applied to an interface.
Why wrong: The output does not indicate whether the ACL is applied; it only shows the ACL contents and match counts.
Question 1,162 of 2,152
300-410 ACL match counters 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. A key principle to apply: aCL match counters. 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 access-lists
Extended IP access list 101
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80 (10 matches)
20 deny tcp any host 10.1.1.1 eq 22 (5 matches)
30 permit icmp any any (2 matches)
40 deny ip any any (1 match)Based on this output, which statement is correct?
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 matching line 10 is permitted and counted correctly.
Option A is correct because line 10 permits TCP traffic from 192.168.1.0/24 to any destination on port 80 (HTTP), and the match counter shows 10 packets matched, confirming the permit action is functioning. Option C is also correct because line 20 denies TCP traffic to host 10.1.1.1 on port 22 (SSH), and the match counter shows 5 packets matched this deny entry. Both statements accurately interpret the ACL output.
Key principle: ACL match counters
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 matching line 10 is permitted and counted correctly.
Why this is correct
Line 10 has 10 matches and is a permit statement, so traffic matching it is permitted.
Related concept
ACL match counters
- ✗
All traffic is permitted because line 40 has only 1 match.
Why it's wrong here
Line 40 is a deny statement; its matches indicate traffic being denied, not permitted.
- ✓
Line 20 denies SSH traffic to host 10.1.1.1, and 5 packets matched.
- ✗
The ACL has no effect because it is not applied to an interface.
Why it's wrong here
The output does not indicate whether the ACL is applied; it only shows the ACL contents and match counts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is misinterpreting the match counters: they only reflect the number of packets that matched the entry, not whether the entry permits or denies. Additionally, an ACL can exist without being applied to an interface, but the 'show access-lists' output does not indicate whether it is applied; the ACL has no effect until applied, but that is not evident from the output alone.
Trap categories for this question
Command / output trap
The output does not indicate whether the ACL is applied; it only shows the ACL contents and match counts.
Detailed technical explanation
How to think about this question
Access control lists (ACLs) process packets sequentially, and the first matching entry determines the action; the match counters increment per packet that matches the entry, providing a useful diagnostic tool for traffic analysis. In this ACL, line 20 denies SSH (TCP port 22) to host 10.1.1.1, and the 5 matches indicate that five SSH packets have been blocked, which is consistent with the deny action. The implicit deny at the end of every ACL is not shown in the output but is effectively replaced by the explicit deny ip any any at line 40, which captures any remaining unmatched traffic.
KKey Concepts to Remember
- ACL match counters
- Implicit deny
- ACL application
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
ACL match counters
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review aCL match counters, then practise related 300-410 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv4 Access Control Lists — This question tests IPv4 Access Control Lists — ACL match counters.
What is the correct answer to this question?
The correct answer is: Traffic matching line 10 is permitted and counted correctly. — Option A is correct because line 10 permits TCP traffic from 192.168.1.0/24 to any destination on port 80 (HTTP), and the match counter shows 10 packets matched, confirming the permit action is functioning. Option C is also correct because line 20 denies TCP traffic to host 10.1.1.1 on port 22 (SSH), and the match counter shows 5 packets matched this deny entry. Both statements accurately interpret the ACL output.
What should I do if I get this 300-410 question wrong?
Review aCL match counters, then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
ACL match counters
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Last reviewed: Jun 24, 2026
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