LFCS Networking Practice Question

A server has two network interfaces: eth0 (public IP 203.0.113.10/24) and eth1 (private IP 10.0.0.1/8). The default gateway is 203.0.113.1. The admin wants to ensure that traffic to the private subnet 10.0.0.0/8 goes via eth1. Which command correctly adds a static route?

⚠ Common exam trap

Many candidates confuse the network address with a host address (as in Option A) or incorrectly assume a gateway is always required (as in Option B), forgetting that directly connected networks only need a device specification.

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

✓

ip route add 10.0.0.0/8 dev eth1

It adds a static route for the 10.0.0.0/8 network directly via the eth1 interface, which is the private interface with IP 10.0.0.1/8. The `ip route add` command with `dev eth1` specifies that traffic destined for the 10.0.0.0/8 subnet should be sent out through eth1, without needing a next-hop gateway since eth1 is directly connected to that subnet.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
ip route add 10.0.0.1/8 dev eth1
Why it's wrong here
This adds a host route, not network.
✗
ip route add 10.0.0.0/8 via 10.0.0.1 dev eth0
Why it's wrong here
Gateway is on wrong subnet, and dev should be eth1.
✓
ip route add 10.0.0.0/8 dev eth1
Why this is correct
Correct: adds network route via device eth1.
✗
route add -net 10.0.0.0/8 eth1
Why it's wrong here
The route command expects different syntax; this is deprecated and incorrect.

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LFCS Networking Practice Question

Why each option matters

Option-by-option breakdown

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