mediumMultiple ChoiceObjective-mapped
XK0-006 The effect of the firewall rules shown? Practice Question
Network Topology
What is the effect of the firewall rules shown?
⚠ Common exam trap
Many candidates assume loopback traffic is implicitly allowed or that the rules apply to all interfaces, but the rules only apply to the INPUT chain on eth0 and do not include any explicit loopback allowance, so only the specified protocols are permitted.
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
✓
SSH and ICMP echo-request are allowed; all other traffic is dropped.
The firewall rules shown explicitly allow SSH (port 22) and ICMP echo-request (type 8) traffic while the final default rule drops all other traffic. This matches option D, as the rules do not permit any other protocols or services, including loopback traffic unless it is SSH or ICMP echo-request.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Only SSH traffic to 192.168.1.10 is allowed; all other traffic is dropped.
Why it's wrong here
Incorrect. The rules allow SSH and ICMP echo-request, not just SSH.
- ✗
Only SSH and loopback traffic are allowed; all other traffic is dropped.
Why it's wrong here
Incorrect. Loopback traffic is not explicitly allowed unless it matches SSH or ICMP echo-request, and that would not cover all loopback traffic.
- ✗
All traffic on eth0 is allowed; loopback is allowed.
Why it's wrong here
Incorrect. The final rule drops all traffic not matching earlier rules, so not all traffic on eth0 is allowed.
- ✓
SSH and ICMP echo-request are allowed; all other traffic is dropped.
Why this is correct
SSH and ICMP echo-request are allowed; all other traffic, including loopback traffic that is not SSH or ICMP echo-request, is dropped.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.