hardMultiple ChoiceObjective-mapped
CISA Practice Question: Based on the exhibit, which of the following is…
Exhibit
Refer to the exhibit.
```
# iptables -L -n -v
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
0 0 ACCEPT tcp -- * * 192.168.1.0/24 0.0.0.0/0 tcp dpt:443
0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443
```Based on the exhibit, which of the following is the MOST likely result of the current firewall configuration?
⚠ Common exam trap
ISACA often tests the concept that an ACL with a permit statement for a specific service from 'any' source overrides any implicit deny, and candidates may mistakenly think that the implicit deny blocks all traffic, forgetting that explicit permits take precedence.
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
✓
Remote SSH connections are permitted from any IP address
The exhibit shows an access control list (ACL) that permits TCP traffic on port 22 (SSH) from any source IP address (0.0.0.0/0) to the destination IP address of the firewall's external interface. Since there is no source restriction, remote SSH connections are allowed from any IP address on the internet. This is a significant security risk because it exposes the firewall's management interface to brute-force attacks from the entire internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Remote SSH connections are permitted from any IP address
Why this is correct
Rule 1 allows SSH from anywhere.
- ✗
SSH access is restricted to the internal network
Why it's wrong here
SSH is allowed from any source.
- ✗
HTTPS traffic from the internal network is blocked
Why it's wrong here
Internal HTTPS is allowed by rule 2.
- ✗
HTTPS traffic from the internet is allowed
Why it's wrong here
The DROP rule blocks it.
Visual reference
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CISA practice question is part of Courseiva's free ISACA 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 CISA exam.