The correct answer is that an external host attempted to connect to an internal web server and was blocked. This is determined by the ASA syslog deny interpretation, where the message shows a deny action for traffic from source IP 10.10.10.10 (external) to destination 192.168.1.100 (internal) on TCP port 443, which is HTTPS. The access-group 'OUTSIDE_IN' applied to the outside interface confirms the packet was blocked by an ACL entry, not by a stateful inspection or NAT failure. On the Cisco CyberOps Associate 200-201 exam, this tests your ability to read ASA syslog messages and map them to real-world security events, often appearing in scenario-based questions where you must distinguish between inbound blocks and outbound denies. A common trap is confusing the source and destination IPs—remember that external IPs are typically public or non-RFC1918 addresses, while internal IPs like 192.168.x.x are private. For a quick memory tip, think "Deny on Outside In = Blocked from the internet to your LAN."
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.
```
Mar 1 12:34:56 192.168.1.100 %ASA-4-106023: Deny tcp src outside:10.0.0.1/54321 dst inside:192.168.1.100/80 by access-group "OUTSIDE_IN" [0x0, 0x0]
```
Refer to the exhibit. An analyst sees this syslog message from a Cisco ASA. What does this log entry indicate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An external host attempted to connect to an internal web server and was blocked.
The syslog message shows a deny action for traffic from an external IP (10.10.10.10) to an internal IP (192.168.1.100) on TCP port 443 (HTTPS). The access-group 'OUTSIDE_IN' is applied to the outside interface, and the deny indicates the packet was blocked by an ACL entry. This matches the scenario of an external host attempting to connect to an internal web server and being blocked.
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.
✗
The access-group 'OUTSIDE_IN' permitted the traffic.
Why it's wrong here
Deny indicates blocked.
✗
An internal host attempted to connect to an external web server.
Why it's wrong here
Source is outside, destination is inside.
✓
An external host attempted to connect to an internal web server and was blocked.
Why this is correct
Matches the deny action and direction.
Related concept
Read the scenario before looking for a memorised answer.
✗
The ASA allowed the connection because it is a stateful firewall.
Why it's wrong here
Log says 'Deny'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the ability to interpret syslog message fields (source/destination IPs and ports) to determine traffic direction and action, and the trap here is assuming that any syslog message from an ASA implies a permitted connection, when the 'deny' keyword clearly indicates a block.
Detailed technical explanation
How to think about this question
The Cisco ASA processes traffic through interface ACLs (access-groups) before stateful inspection. A deny action in the syslog means the packet was dropped by an ACL entry, not by the stateful engine. The 'OUTSIDE_IN' access-group is typically applied inbound on the outside interface to filter traffic from the internet toward internal networks. In real-world deployments, such denies often indicate a blocked inbound connection attempt, which could be a legitimate user or an attacker probing internal services.
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 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.
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: An external host attempted to connect to an internal web server and was blocked. — The syslog message shows a deny action for traffic from an external IP (10.10.10.10) to an internal IP (192.168.1.100) on TCP port 443 (HTTPS). The access-group 'OUTSIDE_IN' is applied to the outside interface, and the deny indicates the packet was blocked by an ACL entry. This matches the scenario of an external host attempting to connect to an internal web server and being blocked.
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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. An analyst sees these syslog messages from the Cisco ASA. What is the most likely cause?
medium
A.An external host attempting to connect to an internal server.
B.A denial-of-service attack from the external IP.
✓ C.An internal host (10.0.0.10) is attempting to access the Internet on port 80 and is being blocked.
D.An internal host is performing a port scan of the external server.
Why C: The syslog messages show the Cisco ASA denying traffic from internal IP 10.0.0.10 to external destination 203.0.113.5 on TCP port 80. The ASA's access control list (ACL) is configured to block outbound HTTP traffic from this host, which is the most likely cause of the denial. The messages indicate a standard deny action, not a signature-based attack detection.
Last reviewed: Jun 11, 2026
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This 200-201 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 200-201 exam.
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