LFCS Networking Practice Question
A company is designing a multi-homed server with two network interfaces: one for internal traffic (eth0) and one for external traffic (eth1). The server must prioritize traffic to the 10.1.0.0/16 network through eth0. What is the best practice to ensure traffic to 10.1.0.0/16 uses eth0?
⚠ Common exam trap
Test-takers frequently confuse policy routing (Option B) as the only way to control interface selection, but a simple static route is the standard and best practice for directing traffic to a specific subnet.
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
✓
Add a static route for 10.1.0.0/16 via the gateway on eth0.
Adding a static route for 10.1.0.0/16 via the gateway on eth0 directly tells the kernel to send traffic destined for that network through eth0. This is the simplest and most direct method, ensuring that the route is always preferred over the default route for that specific destination, without affecting other traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Add a static route for 10.1.0.0/16 via the gateway on eth0.
Why this is correct
A static route directs traffic for that subnet to the correct interface.
- ✗
Configure policy routing using ip rule and two routing tables.
Why it's wrong here
Policy routing is not necessary for a simple static route.
- ✗
Set a lower metric on the default route for eth0.
Why it's wrong here
Metrics affect default gateway selection, not specific subnets.
- ✗
Use bonding to combine both interfaces.
Why it's wrong here
Bonding is for fault tolerance or throughput, not for routing specific subnets.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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