Huawei Certified ICT Professional – Data Center Network (HCIP-DCN) — Question 26

On an RSTP network, several new protection functions are added, such as root protection, loop protection, and TC BPDU attack defense. Which of the following statements are true about the new protection functions of RSTP? (Choose all that apply.)

Answer options

• A. When a designated port enabled with root protection receives RST BPDUs with a higher priority, the port cannot forward packets for a period of time.
• B. After loop protection is enabled, if the root port does not receive BPDUs from the upstream device for a long time, the root port becomes a designated port.
• C. After TC BPDU attack defense is enabled, the device processes excess TC BPDUs together only once after the timer expires.
• D. If BPDU protection is enabled on a device, the attributes of edge ports are affected.

Correct answer: A, B, D

Explanation

Option A is correct because root protection prevents a designated port from forwarding packets for a time when it receives higher priority RST BPDUs. Option B is also correct as the root port can transition to a designated port if BPDUs are not received for an extended time. Option D is right as well, indicating that BPDU protection affects edge port attributes. Option C is incorrect because TC BPDU attack defense does not limit the processing of BPDUs to only once after a timer; it manages BPDUs differently.