View all questions & answers for the BIG-IP Administration Data Plane Concepts (F5CAB2) exam


Question 31 Discussion

When is an interface considered Available for use in a trunk? (Choose one answer)

  • A. An interface is tagged
  • B. The interface is not assigned to a VLAN
  • C. An interface is marked as DOWN
  • D. No option
Correct Answer: B

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B 100%

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Anonymous User 2026-01-19 03:47:40

Selected Answers: B


In BIG-IP terminology:

A trunk is a logical interface combining multiple physical interfaces for link aggregation.

For an interface to be available to be added to a trunk, it cannot already be assigned to something that would conflict, like a VLAN or another trunk.

Now looking at the options:

A. An interface is tagged → Tagging is about VLANs. A tagged interface could still be part of a trunk, but the key is whether it’s already assigned. So tagging alone doesn’t determine availability. ❌

B. The interface is not assigned to a VLAN → Yes. If an interface is free (not part of a VLAN or other trunk), it can be added to a trunk. ✅

C. An interface is marked as DOWN → The administrative or operational state (UP/DOWN) doesn’t determine availability for trunk membership. ❌

D. No option → Not needed; option B is correct. ❌

Correct answer: B. The interface is not assigned to a VLAN