LPIC-1 Essential System Services and Networking Practice Question
Network Topology
A web server running on this host is not accessible from clients. Based on the exhibit, what is the most likely reason?
⚠ Common exam trap
Many exam-takers confuse the FORWARD chain with the INPUT chain, assuming that blocking traffic to a local service requires a FORWARD rule, when in fact the INPUT chain governs packets destined for the host itself.
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
✓
Incoming HTTP traffic is blocked by a DROP rule on port 80.
The exhibit shows a firewall rule set where the INPUT chain has a DROP rule for destination port 80 (HTTP). Since incoming HTTP traffic from clients must traverse the INPUT chain to reach the local web server process, this DROP rule explicitly blocks all inbound HTTP requests, making the web server inaccessible. The FORWARD chain is irrelevant because traffic destined for the local host uses the INPUT chain, not FORWARD.
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 FORWARD chain policy is DROP.
Why it's wrong here
FORWARD does not affect local incoming connections.
- ✗
The OUTPUT chain policy is ACCEPT.
Why it's wrong here
OUTPUT allows outgoing traffic.
- ✓
Incoming HTTP traffic is blocked by a DROP rule on port 80.
Why this is correct
The rule explicitly drops TCP port 80.
- ✗
SSH traffic is blocked.
Why it's wrong here
SSH (port 22) is ACCEPT.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.