Question 396 of 1,420
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350-401 Practice Question: Which three statements about trunking and VLAN…
Which three statements about trunking and VLAN pruning are true? (Choose three.)
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
✓
VTP pruning dynamically removes VLANs from a trunk if the VLAN is not present on the remote switch.
Correct: A is true because VTP pruning reduces unnecessary broadcast traffic on trunk links by dynamically removing VLANs that are not needed on a switch. B is true because pruning can be manually configured on a trunk using the 'switchport trunk allowed vlan' command to restrict which VLANs traverse the link. C is true because VTP pruning requires VTP to be configured and operating in the domain; it is not available without VTP. D is incorrect because VTP pruning works with VTP versions 1 and 2, not just version 3. E is incorrect because the 'switchport trunk native vlan' command sets the native VLAN, not pruning; pruning is controlled by allowed VLAN lists or VTP pruning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VTP pruning dynamically removes VLANs from a trunk if the VLAN is not present on the remote switch.
Why this is correct
Correct because VTP pruning advertises VLAN membership and prunes unnecessary VLANs from trunk links.
- ✓
Manual pruning can be achieved using the 'switchport trunk allowed vlan' command.
Why this is correct
Correct because this command explicitly defines which VLANs are permitted on the trunk.
- ✓
VTP pruning requires VTP to be enabled on the switches in the management domain.
Why this is correct
Correct because VTP pruning is a feature of VTP and cannot function without VTP configured.
- ✗
VTP pruning is only supported in VTP version 3.
Why it's wrong here
Incorrect because VTP pruning is supported in VTP versions 1 and 2 as well.
- ✗
The 'switchport trunk native vlan' command is used to prune VLANs from a trunk.
Why it's wrong here
Incorrect because this command sets the native VLAN; pruning is done via allowed VLAN lists or VTP pruning.
Visual reference
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Last reviewed: Jun 18, 2026
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