JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 14

Which two statements about Layer 2 loop prevention protocols are correct? (Choose two.)

Answer options

• A. RSTP distributes the current tree topology using the root bridge.
• B. STP can take 30 to 50 seconds to respond to a topology change.
• C. RSTP can take 30 to 50 seconds to respond to a topology change.
• D. STP distributes the current tree topology using the root bridge.

Correct answer: B, D

Explanation

Option B is correct because STP does indeed have a slow response time of 30 to 50 seconds when there is a topology change. Option D is also accurate as STP utilizes the root bridge to distribute the tree topology. Options A and C are incorrect because they refer to RSTP, which operates more quickly than STP and does not take as long to respond.