单项选择题 What is the default maximum number of equal-cost paths that can be placed into the routing of a cisco OSPF router?（）

多项选择题 Which two states are the port states when RSTP has converged？（）

单项选择题 A network administrator needs to force a high-performance switch that is located in the MDF to become the root bridge for a redundant path switched network. What can be done to ensure that this switch assumes the role as root bridge（）。