单项选择题
A. path cost
B. lowest port MAC address
C. VTP revision number
D. highest port priority number
E. port priority number and MAC address
单项选择题 What is the purpose of the OSPF router ID in a OR/BOR election?（）
单项选择题 A network administrator needs to verify that switch interface 0/5 has been assigned to the Sales VLA.N. Which command will accomplish this task?（）
单项选择题 How can an administrator determine if a router has been configured when it is first powered up?（）