Huawei Certified Network Professional – Routing and Switching v2 (HCNP-RS) — Question 35

Which of the following statements about BFD control packets are true? (Choose three.)

Answer options

• A. A BFD control packet is encapsulated in a UDP packet for transmission. Authentication fields in a BFD control packet are optional.
• B. BFD detection is not available in VRP 5.7.
• C. Echo packets use UDP destination port number 3784.
• D. Echo packets use UDP destination port number 3785.

Correct answer: A, B, C

Explanation

Option A is correct because BFD control packets are indeed encapsulated in UDP, and authentication fields are optional. Option B is correct since BFD detection is not supported in VRP 5.7. Option C is correct as echo packets do use UDP destination port 3784. Option D is incorrect because echo packets do not use port 3785.