LFCS Networking Practice Question
Exhibit
[user@server ~]$ ip route show default via 10.0.0.1 dev eth0 proto static metric 100 10.0.0.0/24 dev eth0 proto kernel scope link src 10.0.0.5 metric 100 10.0.1.0/24 via 10.0.0.2 dev eth0 proto static metric 100 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.10 metric 101
Refer to the exhibit. A server is configured with two network interfaces. A user on the 192.168.2.0/24 network reports that they cannot reach the server at IP 10.0.0.5. What is the most likely cause based on the routing table?
⚠ Common exam trap
Linux Foundation often tests the misconception that a missing route only affects outbound traffic, but the trap here is that the server can receive packets from the 192.168.2.0/24 network but cannot reply, causing a one-way communication failure that users perceive as 'cannot reach the server'.
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
✓
There is no route on the server to the 192.168.2.0/24 network.
The routing table on the server does not contain a route for the 192.168.2.0/24 network. When the user on that network sends traffic to 10.0.0.5, the server can receive it, but any reply traffic from the server to the 192.168.2.0/24 source address will be dropped because the server has no matching route. Without a route to the source network, the server cannot send return packets, making communication fail.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
There is no route on the server to the 192.168.2.0/24 network.
Why this is correct
Without a return route, the server cannot send replies to the 192.168.2.0/24 network.
- ✗
The default gateway is misconfigured; it should be 192.168.1.1.
Why it's wrong here
The default gateway is correctly set to 10.0.0.1 for traffic on eth0.
- ✗
The server's IP address 10.0.0.5 is not in the same subnet as the default gateway.
Why it's wrong here
10.0.0.5 is in the same subnet as 10.0.0.1 (10.0.0.0/24).
- ✗
The firewall on eth0 is blocking incoming traffic.
Why it's wrong here
There is no indication of firewall rules in the routing table.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.