mediumMultiple ChoiceObjective-mapped
200-201 Practice Question: An analyst reviews the ACL applied to the outside…
Exhibit
Refer to the exhibit. ! Output from show access-list 101 ! Extended IP access list 101 ! 10 permit tcp 192.168.1.0 0.0.0.255 host 10.10.10.10 eq 443 ! 20 deny ip any any log !
An analyst reviews the ACL applied to the outside interface of a router. The analyst notices that traffic from 192.168.1.0/24 to 10.10.10.10 on port 443 is permitted, but all other traffic is denied and logged. Which of the following is a potential security issue with this ACL?
⚠ Common exam trap
Cisco often tests the misconception that logging on a permit statement is necessary for monitoring, when in fact the critical security issue is that logging on a deny-all can cause log flooding that masks real attacks.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The deny statement with logging may generate excessive logs, potentially masking attacks.
The ACL has a single permit statement for traffic from 192.168.1.0/24 to 10.10.10.10 on port 443, followed by an implicit deny all that is logged. This means every packet that does not match the permit rule generates a log entry. In a production environment, even normal background noise (e.g., scans, broadcast traffic) can produce thousands of log messages per second, overwhelming syslog storage and masking malicious activity. The core issue is that logging on the deny-all can cause log flooding, not that the permit lacks logging.
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 deny statement with logging may generate excessive logs, potentially masking attacks.
Why this is correct
Excessive logging can bury important alerts in noise.
- ✗
The ACL is applied inbound on the outside interface, which could allow external traffic.
Why it's wrong here
The exhibit does not indicate the direction; it just shows the ACL content.
- ✗
The permit statement does not have logging enabled, so traffic is not monitored.
Why it's wrong here
Logging on permit is optional; the issue is the deny log.
- ✗
The ACL allows all traffic from 192.168.1.0/24 to 10.10.10.10 on any port.
Why it's wrong here
It only permits port 443, not all ports.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.