The correct answer is that ACL 101 denies Telnet and permits HTTP, as confirmed by the log entries showing a denied packet to port 23 (Telnet) and a permitted packet to port 80 (HTTP). This conclusion is drawn from interpreting the ACL log entries, where each line records whether a packet was permitted or denied based on the destination port number; port 23 is the standard Telnet port, and port 80 is the standard HTTP port. On the Cisco CyberOps Associate 200-201 exam, this type of question tests your ability to read ACL log output and map port numbers to common services, a skill essential for security monitoring. A common trap is confusing the direction of the log—remember that a “deny” entry means the packet was blocked, not allowed. For a quick memory tip, think of the port numbers: 23 for Telnet (blocked) and 80 for HTTP (allowed), and note that HTTP is always permitted in this scenario.
200-201 Security Policies and Procedures Practice Question
This 200-201 practice question tests your understanding of security policies and procedures. 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
%SEC-6-IPACCESSLOGS: list 101 denied tcp 192.0.2.5(12345) -> 10.1.1.100(23), 1 packet
%SEC-6-IPACCESSLOGS: list 101 permitted tcp 192.0.2.5(12345) -> 10.1.1.100(80), 1 packet
Refer to the exhibit. A security analyst views these log entries from a Cisco router. What conclusion can be drawn about ACL 101?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ACL 101 denies Telnet and permits HTTP
The log shows a denied packet to port 23 (Telnet) and a permitted packet to port 80 (HTTP). This indicates the ACL denies Telnet and permits HTTP. Option B is correct. Option A is incorrect because some traffic is denied. Option C is incorrect because the ACL likely allows other ports. Option D is incorrect because HTTP is permitted.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
Denied entries show not all traffic is permitted.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 200-201 ACL questions on filtering logic and placement.
Security Policies and Procedures — This question tests Security Policies and Procedures — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: ACL 101 denies Telnet and permits HTTP — The log shows a denied packet to port 23 (Telnet) and a permitted packet to port 80 (HTTP). This indicates the ACL denies Telnet and permits HTTP. Option B is correct. Option A is incorrect because some traffic is denied. Option C is incorrect because the ACL likely allows other ports. Option D is incorrect because HTTP is permitted.
What should I do if I get this 200-201 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 200-201 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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