LPIC-2 Advanced Networking Configuration Practice Question
Which TWO conditions must be met for a Linux bridge to forward traffic between its ports?
⚠ Common exam trap
Many candidates confuse the requirements for a bridge with those for a router, incorrectly assuming an IP address is necessary for forwarding, or they forget that the bridge kernel module must be explicitly loaded in Linux.
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 bridge has at least two ports added.
A Linux bridge requires at least two ports to forward traffic; a bridge with only one port cannot forward frames between interfaces. Option C is correct because the bridge kernel module must be loaded (e.g., via `modprobe bridge`) to provide the bridging functionality; without it, bridge operations are impossible.
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 bridge has an IP address.
Why it's wrong here
A bridge can forward L2 traffic without an IP.
- ✓
The bridge has at least two ports added.
Why this is correct
Forwarding between ports requires at least two interfaces in the bridge.
- ✓
The kernel module bridge is loaded.
Why this is correct
The bridge functionality is provided by the kernel module.
- ✗
The interfaces are in promiscuous mode.
Why it's wrong here
Interfaces are automatically placed in promiscuous mode when added to a bridge.
- ✗
Spanning Tree Protocol is disabled.
Why it's wrong here
STP can be enabled or disabled; it is not a requirement for forwarding.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-2 practice question is part of Courseiva's free LPI 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 LPIC-2 exam.