The correct answer is that the ACL permits only HTTP traffic to host 10.0.1.10 and denies all else. This is because the access control list interpretation hinges on the explicit permit statement for TCP port 80, which matches HTTP traffic destined for that specific host, followed by an implicit deny all that blocks every other packet. On the Cisco CyberOps Associate 200-201 exam, this tests your ability to read an ACL entry and understand that the implicit deny is always the final rule, even if not shown—a common trap is forgetting that no explicit deny statement means all non-matching traffic is still dropped. Remember the memory tip: “Permit what you need, deny the rest by default.”
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
access-list OUTSIDE extended permit tcp any host 10.0.1.10 eq www
access-list OUTSIDE extended deny ip any any
Refer to the exhibit. What is the effect of this ACL applied to an interface?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Allows only HTTP traffic to host 10.0.1.10 and denies all else
The ACL in the exhibit (assuming it is a standard or extended ACL with a permit statement for TCP port 80 to host 10.0.1.10 and an implicit deny all) explicitly permits only HTTP traffic (TCP port 80) to the destination host 10.0.1.10. All other traffic is denied by the implicit deny all at the end of the ACL, making option C correct.
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.
Common exam trap: answer the scenario, not the keyword
Cisco often tests the implicit deny all behavior, where candidates mistakenly think an ACL with only a permit statement allows all other traffic, when in fact it denies everything not explicitly permitted.
Detailed technical explanation
How to think about this question
Cisco ACLs process entries sequentially from top to bottom, and each entry is checked against the packet; the first match determines the action (permit or deny). The implicit deny all at the end of every ACL is a fundamental security behavior that blocks any traffic not explicitly matched, which is why only HTTP to 10.0.1.10 is permitted. In real-world deployments, forgetting to add a permit statement for necessary traffic (e.g., DNS, ICMP) can silently break network services, a common pitfall in ACL design.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Intrusion Analysis — This question tests Network Intrusion Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Allows only HTTP traffic to host 10.0.1.10 and denies all else — The ACL in the exhibit (assuming it is a standard or extended ACL with a permit statement for TCP port 80 to host 10.0.1.10 and an implicit deny all) explicitly permits only HTTP traffic (TCP port 80) to the destination host 10.0.1.10. All other traffic is denied by the implicit deny all at the end of the ACL, making option C correct.
What should I do if I get this 200-201 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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