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 180
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80 (50 matches)
20 permit tcp 192.168.2.0 0.0.0.255 any eq 443 (30 matches)
30 deny ip any any (5 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 to port 80 is permitted.
Option A is correct because the ACL explicitly permits TCP traffic from the 192.168.1.0/24 network to any destination on port 80, as shown by the first entry with 50 matches. The output confirms that this traffic is being allowed, so there is no problem with that specific rule.
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 to port 80 is permitted.
Why this is correct
Line 10 permits that traffic with 50 matches.
Related concept
Read the scenario before looking for a memorised answer.
✗
Traffic from 192.168.2.0/24 to port 443 is denied.
Why it's wrong here
Line 20 permits that traffic with 30 matches.
✗
All traffic from 192.168.1.0/24 is permitted.
Why it's wrong here
Only HTTP is permitted; other traffic from that subnet is denied by line 30.
✗
The ACL is correctly configured to allow only specific web traffic.
Why it's wrong here
While it allows specific web traffic, it denies all other traffic, which may be a problem if other services are needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the ability to interpret ACL match counters and recognize that a working ACL with expected matches does not indicate a problem, leading candidates to incorrectly assume a misconfiguration when none exists.
Detailed technical explanation
How to think about this question
The ACL is applied as an extended access list, which evaluates packets sequentially from top to bottom. The first matching entry is applied, and the implicit deny any at the end (or the explicit deny ip any any) blocks all other traffic. In this scenario, the ACL is correctly permitting specific web traffic from the two subnets, and the match counters indicate that traffic is flowing as expected, so there is no actual problem—this is a trick question where the output shows a working ACL.
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 from 192.168.1.0/24 to port 80 is permitted. — Option A is correct because the ACL explicitly permits TCP traffic from the 192.168.1.0/24 network to any destination on port 80, as shown by the first entry with 50 matches. The output confirms that this traffic is being allowed, so there is no problem with that specific rule.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.