Which three of these items are IPv6 transition mechanisms? （）(Choose three.)

单项选择题Which configuration will enable OSPF for IPv6 on FastEthernet 0 0 0?（）

A.A
B.B
C.C
D.D

单项选择题In a high-availability network, which command, when placed on ports that have connected end stations, will allow you to prevent delays in service for end stations by placing a port in blocking mode?（）

A. enable backbone fast
B. enable uplink fast
C. disable portfast
D. enable portfast

多项选择题In a RSTP implementation, which of the following two link types are used? （）(Choose two.)

A. Shared
B. Point-to-Point
C. Designated
D. Multiaccess non-broadcast

单项选择题As an experienced network engineer, you are asked to troubleshoot a CIS network outage. During the troubleshooting process, you notice that one of your colleagues connects additional devices to the network with the use of his own switch. With the purpose of improving speed, the switch is attached to both network ports in an office, which leads to bridge loop. Enabling which of the following feature will be able to prevent this problem from happening again?（）

A.GLBP
B.RSTP
C.BPDU guard
D.root guard

单项选择题What is the function of the no switchport catalyst switch interface configuration command?（）

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