During routine maintenance， G1/0/1 on DS1 was shutdown. All other interface were up. DS2 became the active HSRP device for Vlan101 as desired. However， after G1/0/1 on DS1 was reactivated. DS1 did not become the active HSRP device as desired. 
What need to be done to make the group for Vlan101 function properly ？ （）

单项选择题Refer to the exhibit.  Which Virtual Router Redundancy Protocol （VRRP） statement is true about the roles of the master virtual router and the backup virtual router？（）

A.Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails， Router B will become the master virtual router. When Router A recovers， Router B will maintain the role of master virtual router.
B.Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails， Router B will become the master virtual router. When Router A recovers， it will regain the master virtual router role.
C.Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails， Router A will become the master virtual router. When Router B recovers， Router A will maintain the role of master virtual router.
D.Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails， Router A will become the master virtual router. When Router B recovers， it will regain the master virtual router role.

单项选择题Refer to the exhibit. Switch S2 contains the default configuration. Switches S1 and S3 both have had the command spanning-tree mode rapid-pvst issued on them.  What will be the result？（）

A.Switches S1 and S3 will be able to exchange traffic but neither will be able to exchange traffic with Switch S2
B.Switches S1， S2， and S3 will be able to pass traffic between themselves. However， if there is a topology change， Switch S2 will not receive notification of the change.
C.Switches S1， S2， and S3 will be able to pass traffic between themselves.
D.IEEE 802.1D and IEEE 802.1w are incompatible. All three switches must use the same standard or no traffic will pass between any of the switches.

单项选择题WhichstatementiscorrectaboutRSTPportroles？（）

A.The designated port is the switch port on every nonroot bridge that is the chosen path to theroot bridge. There can be only one designated port on every switch. The designated portassumes the forwarding state in a stable active topology. All switches connected to a given segment listen to all BPDUs and determine the switch that will be the root switch for a particular segment.
B.The disabled port is an additional switch port on the designated switch with a redundant link to the segment for which the switch is designated. A disabled port has a higher port ID than the disabled port on the designated switch. The disabled port assumes the discarding state in astable active topology.
C.The backup port is a switch port that offers an alternate path toward the root bridge. The backup port assumes a discarding state in a stable， active topology. The backup port will be present on nondesignated switches and will make a transition to a designated port if the current designated path fails.
D.The root port is the switch port on every nonroot bridge that is the chosen path to the root bridge. There can be only one root port on every switch. The root port assumes the forwarding state in a stable active topology.

单项选择题Refer to the exhibit. Based on the output of the show spanning-tree command，  which statement is true？ （）

A.Switch SW1 has been configured with the spanning-tree vlan 1 root primary global configuration command.
B.Switch SW1 has been configured with the spanning-tree vlan 1 root secondary global configuration command.
C.Switch SW1 has been configured with the spanning-tree vlan 1 priority 24577 global configuration command.
D.Switch SW1 has been configured with the spanning-tree vlan 1 hello-time 2 global configuration command.
E.The root bridge has been configured with the spanning-tree vlan 1 root secondary global configuration command.

单项选择题Refer to the exhibit. On the basis of the output of the show spanning-tree inconsistentports command，  which statement about interfaces FastEthernet 0 1 and FastEthernet 0 2 is true？（）

A.They have been configured with the spanning-tree bpdufilter disable command.
B.They have been configured with the spanning-tree bpdufilter enable command.
C.They have been configured with the spanning-tree bpduguard disable command.
D.They have been configured with the spanning-tree bpduguard enable command.
E.They have been configured with the spanning-tree guard loop command.
F.They have been configured with the spanning-tree guard root command.