LFCS Networking Practice Question
A systemd-networkd managed interface enp1s0 needs to be configured with a static IP address 192.168.1.100/24 and a default gateway via 192.168.1.1. Which .network file configuration is correct?
⚠ Common exam trap
A common mix-up: candidates confuse the `[Match]` section key `Name=` with `Interface=` (which is used in other tools like ifcfg files) and mistakenly use `DefaultGateway=` (a valid directive in some network configuration systems like Netplan) instead of the correct `Gateway=` in systemd-networkd.
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
✓
[Match] Name=enp1s0 [Network] Address=192.168.1.100/24 Gateway=192.168.1.1
Systemd-networkd uses the `[Match]` section with `Name=` to match the interface, and the `[Network]` section with `Address=` to assign a static IP address and `Gateway=` to set the default gateway. The syntax `Address=192.168.1.100/24` is the proper directive for defining a static IP address in a .network file, and `Gateway=192.168.1.1` correctly specifies the default gateway.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
[Match] Interface=enp1s0 [Network] StaticIP=192.168.1.100/24 Gateway=192.168.1.1
Why it's wrong here
'Interface' should be 'Name'; 'StaticIP' is invalid.
- ✗
[Link] Name=enp1s0 [Network] IPAddress=192.168.1.100/24 Gateway=192.168.1.1
Why it's wrong here
Use [Match] not [Link]; 'IPAddress' is incorrect.
- ✓
[Match] Name=enp1s0 [Network] Address=192.168.1.100/24 Gateway=192.168.1.1
Why this is correct
Correct syntax for static IP and gateway.
- ✗
[Match] Name=enp1s0 [Network] Address=192.168.1.100/24 DefaultGateway=192.168.1.1
Why it's wrong here
'DefaultGateway' is not a valid key; use 'Gateway'.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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