LPIC-2 Advanced Networking Configuration Practice Question
To create a simple bridge interface that connects two Ethernet interfaces, which of the following commands should be used?
⚠ Common exam trap
The trap here is that candidates may remember the older `brctl` commands as valid, but fail to notice the syntax error in Option B (adding two interfaces at once) and assume both A and B are correct, leading them to choose Option D.
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 link add br0 type bridge && ip link set br0 up
The `ip link add br0 type bridge` command creates a new bridge interface using the modern iproute2 suite, and `ip link set br0 up` activates it. This is the current standard method for bridge creation on Linux, replacing the older brctl tool. The bridge then connects Ethernet interfaces by enslaving them with `ip link set eth0 master br0`.
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 link add br0 type bridge && ip link set br0 up
Why this is correct
This creates the bridge and brings it up using the iproute2 suite.
- ✗
brctl addbr br0 && brctl addif br0 eth0 eth1
Why it's wrong here
This uses the deprecated brctl tool and does not bring up the bridge automatically.
- ✗
ifconfig br0 create && ifconfig br0 up
Why it's wrong here
ifconfig does not support creating bridges.
- ✗
Both A and B work correctly
Why it's wrong here
While both can be used, the question asks for a single command set that is commonly used; A is the preferred modern method.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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