The correct answer is that a TCP connection from outside to inside was denied. This syslog deny message meaning is rooted in the Cisco ASA’s default security behavior: traffic moving from a lower-security interface (outside) to a higher-security interface (inside) is implicitly blocked unless an explicit access control entry (ACE) permits it. The message “denied” confirms the packet was dropped by the ASA’s implicit or explicit access control, not allowed through. On the Cisco CyberOps Associate 200-201 exam, this tests your ability to interpret ASA syslog messages and understand zone-based security policies. A common trap is confusing “denied” with a failed authentication or a routing error—remember that “denied” here always refers to a policy drop, not a protocol failure. For a quick memory tip: think of the ASA as a bouncer who says “no” to anyone coming from a lower-security zone unless they have a written invitation (an access-list entry).
200-201 Security Concepts Practice Question
This 200-201 practice question tests your understanding of security concepts. 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.
%ASA-4-106023: Deny tcp src outside:192.168.1.10/12345 dst inside:10.0.0.10/80 by access-group "outside_access_in"
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A TCP connection from outside to inside was denied.
The syslog message indicates that a TCP connection attempt from an outside (lower-security) zone to an inside (higher-security) zone was denied by the ASA's implicit or explicit access control. By default, the Cisco ASA denies all inbound traffic from a lower security level to a higher security level unless explicitly permitted by an access-list applied to the interface. The message 'denied' confirms the packet was dropped, not allowed.
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.
✓
A TCP connection from outside to inside was denied.
Why this is correct
The source is outside and destination inside, and it was denied.
Related concept
Read the scenario before looking for a memorised answer.
✗
A TCP connection from inside to outside was denied.
Why it's wrong here
The source is outside, not inside.
✗
The access group name is incorrect.
Why it's wrong here
The access group name is present and valid.
✗
A TCP connection was allowed from inside to outside.
Why it's wrong here
The message says 'Deny', not allow.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the default security-level behavior of the ASA, where candidates mistakenly assume that all denied traffic is from inside to outside, or that the message indicates an error in the access group name rather than a simple deny action.
Detailed technical explanation
How to think about this question
The Cisco ASA uses a security-level-based model where traffic from a higher security level to a lower level is allowed by default, while traffic from lower to higher is implicitly denied. This syslog message (typically %ASA-4-106023) includes the source and destination IPs, ports, and the access-list name (if applied) that caused the deny. In a real-world scenario, this log could indicate a legitimate external user being blocked due to missing permit rules, or an attempted intrusion being stopped by the firewall.
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 Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A TCP connection from outside to inside was denied. — The syslog message indicates that a TCP connection attempt from an outside (lower-security) zone to an inside (higher-security) zone was denied by the ASA's implicit or explicit access control. By default, the Cisco ASA denies all inbound traffic from a lower security level to a higher security level unless explicitly permitted by an access-list applied to the interface. The message 'denied' confirms the packet was dropped, not allowed.
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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