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 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)
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 the ACL shows 10 matches for line 10, which permits TCP traffic from the 192.168.1.0/24 network to any destination on port 80 (HTTP). The match counter accurately reflects the number of packets that have matched this specific entry, confirming that permitted traffic is being counted correctly.
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 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
Read the scenario before looking for a memorised answer.
✗
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.
Why this is correct
Line 20 denies TCP port 22 (SSH) to host 10.1.1.1, with 5 matches.
Related concept
Read the scenario before looking for a memorised answer.
✗
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
Cisco often tests the misconception that an ACL's match counters indicate the action taken (permit or deny) rather than just the number of packets that matched the entry, and that an ACL must be applied to an interface to have any effect, but the show access-lists output does not reveal whether it is applied.
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
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 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.
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 matching line 10 is permitted and counted correctly. — Option A is correct because the ACL shows 10 matches for line 10, which permits TCP traffic from the 192.168.1.0/24 network to any destination on port 80 (HTTP). The match counter accurately reflects the number of packets that have matched this specific entry, confirming that permitted traffic is being counted correctly.
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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