单项选择题
A. Disables the interfaces to prevent traffic flow
B. Clears all the configurations on the interface
C. Switches the port from access mode to trunk mode
D. Converts the port from physical Layer 2 port to physical Layer 3 port
单项选择题 What is the maximum number of Cisco Catalyst 3750 Series Switches that can be united into a single manageable unit using the Cisco StackWise technology?（）
单项选择题 As a network administrator, you issue the interface auto qos voip cisco-phone command on a port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）
单项选择题 What is the most likely reason that an IBGP route that has been selected as a best route is not entered into the IP routing table?（）