RSTP and MX Series Devices
Question
Your network runs RSTP and includes a LAN segment shared by two MX Series devices. The two MX Series devices sharing this LAN segment each have two connections on the shared segment.
Which two statements are true? (Choose two.)
Answers
Explanations
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A. B. C. D.AD
RSTP (Rapid Spanning Tree Protocol) is a network protocol used to prevent loops in a network topology by creating a tree-like structure. In this scenario, we have two MX Series devices sharing a LAN segment, with each device having two connections on the shared segment. Here are the correct statements regarding this scenario:
A. The port on the selected MX Series device with the lowest port ID is selected as the designated port. This statement is true. RSTP selects a designated port on each device, which is the port that will forward traffic towards the root bridge. In this scenario, the MX Series device with the lowest port ID will be selected as the designated port.
B. The MX Series device with the highest-cost path to the root bridge is selected as a designated bridge for the shared segment. This statement is false. RSTP does not select a designated bridge for the shared segment. Instead, it selects a designated port on each device, as explained in statement A.
C. The port on the selected MX Series device with the highest port ID is selected as the designated port. This statement is false. RSTP selects the designated port based on the port ID, but it chooses the port with the lowest port ID, not the highest.
D. The MX Series device with the least-cost path to the root bridge is selected as the designated bridge for the shared segment. This statement is also false. RSTP does not select a designated bridge for the shared segment, as explained in statement B.
Therefore, the correct statements are A and B.
