350-601 Network Practice Question
Exhibit
interface Port-channel10 no switchport ip address 10.1.1.1/30 ip ospf network point-to-point
Refer to the exhibit. A network engineer has configured a port-channel for OSPF adjacency. What additional configuration is required for the port-channel to operate correctly?
⚠ Common exam trap
Cisco often tests the misconception that creating the port-channel interface alone is sufficient, when in fact the member interfaces must be explicitly assigned to the port-channel using the channel-group command.
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
✓
Configure the channel-group mode on member interfaces.
For a port-channel to form an OSPF adjacency, the member interfaces must be configured with a channel-group mode (e.g., 'channel-group 1 mode active') to bundle them into a logical port-channel interface. Without this, the interfaces remain individual Layer 2 or Layer 3 links, and OSPF cannot establish adjacency over the port-channel as a single logical link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set the OSPF priority.
Why it's wrong here
Priority is optional and does not affect basic functionality.
- ✗
No additional configuration needed.
Why it's wrong here
Member interfaces are missing; port-channel is essentially empty.
- ✗
Enable OSPF on the port-channel with `ip router ospf process`.
Why it's wrong here
OSPF is enabled on the interface once the network command covers it.
- ✓
Configure the channel-group mode on member interfaces.
Why this is correct
Member interfaces must be assigned to the port-channel using `channel-group`.
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