The correct answer is that all HTTPS traffic to the host 198.51.100.10 is permitted. This is because the ACL entry 'permit tcp any host 198.51.100.10 eq 443' specifies a permit action for TCP traffic, with any source address, destined specifically to the host 198.51.100.10 on port 443, which is the well-known port for HTTPS. Interpreting ACL permit statements on the Cisco CyberOps Associate 200-201 exam tests your ability to read the exact syntax of an access control entry, focusing on the protocol, source, destination, and port operator. A common trap is misreading the 'eq' keyword as applying to the source instead of the destination, or forgetting that 'any' means all source IPs are allowed. Remember the memory tip: "eq always follows the destination unless a source port is explicitly stated"—so when you see 'eq 443' after a host IP, that port is the destination port, making it HTTPS traffic to that specific host.
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. 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
Refer to the exhibit.
access-list INTERNET extended permit tcp any host 198.51.100.10 eq 443
access-list INTERNET extended deny ip any any
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All HTTPS traffic to the host 198.51.100.10.
The exhibit shows an access control list (ACL) entry 'permit tcp any host 198.51.100.10 eq 443'. This permits TCP traffic with a destination port of 443 (HTTPS) to the specific host 198.51.100.10 from any source. Therefore, only HTTPS traffic destined to that host is permitted, making option D 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.
✗
All IP traffic from the host 198.51.100.10.
Why it's wrong here
The permit is for incoming traffic to the host, not from it.
✗
Only HTTPS traffic from the host 198.51.100.10.
Why it's wrong here
The permit is to the host, not from the host.
✗
All TCP traffic from any host to any host.
Why it's wrong here
The permit only applies to a specific destination, not any.
✓
All HTTPS traffic to the host 198.51.100.10.
Why this is correct
The ACL permits TCP any to host on port 443 (HTTPS).
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the directionality of ACL rules, and the trap here is confusing the source and destination fields, leading candidates to mistakenly think the rule permits traffic from the host rather than to the host.
Detailed technical explanation
How to think about this question
The ACL entry uses the 'eq' operator to match the destination port exactly, which is a common method for filtering application-layer protocols like HTTPS (TCP/443). In Cisco IOS ACLs, the order of entries matters, and an implicit 'deny all' follows the last permit statement. In a real-world scenario, this ACL would be applied inbound on an interface to restrict incoming web traffic to a specific server while blocking all other inbound connections.
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.
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: All HTTPS traffic to the host 198.51.100.10. — The exhibit shows an access control list (ACL) entry 'permit tcp any host 198.51.100.10 eq 443'. This permits TCP traffic with a destination port of 443 (HTTPS) to the specific host 198.51.100.10 from any source. Therefore, only HTTPS traffic destined to that host is permitted, making option D 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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