JN0-349 Exam - Question 34

Referring to the exhibit, the RSTP (Rapid Spanning Tree Protocol) root port is the port on a non-root bridge with the lowest path cost to the root bridge. In this scenario, Switch-1 is the root bridge. Examining the path costs on Switch-2, the port ge-0/0/10.0 has a cost of 1. However, the total path cost is critical. The direct paths from Switch-2 to the root bridge through ge-0/0/1.0 have a lower overall cost compared to any other path, because its own cost is 20000 for ge-0/0/8.0 and ge-0/0/9.0, and 20001 for ge-0/0/10.0 considering Switch-3’s interface cost. Therefore, ge-0/0/1.0 will be selected as the root port on Switch-2.