LFCS Service Configuration Practice Question
Which two statements are true about systemd socket activation? (Choose two.)
⚠ Common exam trap
Test-takers frequently confuse the 'Type=' directive in the service unit (e.g., 'Type=socket') with the socket unit's role, leading them to incorrectly select Option B, when in fact the service type is independent of socket activation.
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 service unit must include 'Sockets=<socket unit>' to bind the service to the socket.
The service unit must include a 'Sockets=' directive (e.g., 'Sockets=myapp.socket') to explicitly bind the service to the corresponding socket unit. This tells systemd which socket(s) the service should accept connections from when activated. Without this directive, the service will not receive the file descriptors for the socket, and activation will 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.
- ✗
The socket unit file must have an [Install] section.
Why it's wrong here
The socket unit can be enabled but it's not strictly required for activation.
- ✗
Socket activation requires the service to be of type 'socket'.
Why it's wrong here
The service type is separate; the socket unit handles the socket.
- ✓
The service unit must include 'Sockets=<socket unit>' to bind the service to the socket.
Why this is correct
This directive links the service to the socket unit.
- ✓
A service can be started on demand when a connection arrives on a socket.
Why this is correct
This is the core feature of socket activation.
- ✗
Socket activation only works with TCP sockets.
Why it's wrong here
It also works with Unix sockets.
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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.