LFCS Networking Practice Question
Exhibit
Refer to the exhibit. # ip route show 10.0.1.0/24 dev eth0 proto kernel scope link src 10.0.1.10 10.0.2.0/24 dev eth1 proto kernel scope link src 10.0.2.10 default via 10.0.1.1 dev eth0
A host with this routing table can ping 10.0.2.1 but cannot ping 8.8.8.8. What is the most likely cause?
⚠ Common exam trap
Candidates often assume a missing default route is the only cause for internet unreachability, but the question explicitly states the routing table includes a default route, shifting the focus to the gateway's own connectivity or upstream routing failure.
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 default gateway 10.0.1.1 does not have internet connectivity
The host can ping 10.0.2.1, which is on the directly connected 10.0.2.0/24 network, confirming that the local interface and link-layer are functional. However, it cannot ping 8.8.8.8, a public internet address. The routing table shows a default route via 10.0.1.1, so the host will forward the packet to that gateway. Since the host has a default route, the most likely cause is that the gateway 10.0.1.1 itself lacks internet connectivity (e.g., no upstream route, NAT misconfiguration, or ISP outage), preventing the packet from reaching 8.8.8.8.
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 default route is missing
Why it's wrong here
The table shows a default route via 10.0.1.1.
- ✓
The default gateway 10.0.1.1 does not have internet connectivity
Why this is correct
Even though the host can reach the gateway, the gateway itself may not have a path to the internet.
- ✗
The host has no route to 10.0.2.0/24
Why it's wrong here
The table shows a direct route to 10.0.2.0/24 via eth1.
- ✗
The host has no route to 10.0.1.1
Why it's wrong here
The host has a direct route to 10.0.1.0/24, so it can reach 10.0.1.1.
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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.