Ccna certification Practice Tests

407

 31.  A.  The command 

channel-group 1 mode passive configures the port to be placed in 

a passive negotiating state. The other switch must be placed into an active negotiating 

state for LACP to become the control protocol for the channel group. If the other switch 

is configured with desirable mode, there will be a mismatch and the interface will enter 

an err-disabled state. If the other switch is configured with on mode, then it will not form 

an EtherChannel link. If the other switch is configured with auto mode, there will be a 

mismatch and the interface will enter an err-disabled state.

 32.  B.  The long delay for the device to become active on the interface is the wait time for 

convergence of Spanning Tree Protocol (STP). If the interface will only connect a device to 

the port, then the port should be configured with spanning-tree PortFast mode. This will 

skip the blocking mode during convergence of STP. Turning off auto-negotiation on the 

interface will not do anything other than statically set the speed and duplex. Configuring 

BPDU Guard mode for spanning tree is a good idea, but it will not speed up convergence 

of STP. Turning off port security will not speed up convergence of the STP protocol.

 33.  B.  When all of the ports on a switch are in designated mode, it means that the switch is 

the root bridge for the Spanning Tree Protocol (STP). If the switch was connected to a root 

bridge, you would see the ports as being root ports. The switch is obviously participating 

in STP because it is displaying a status for the STP port state. The switch is already the 

root bridge, and it cannot be a backup root bridge as well.

 34.  B.  When BPDU Guard is configured on a port, it guards the port from creating a loop. 

It also guards STP so that the STP calculation of redundant links is not affected by the 

device connected to the interface. If a BPDU is seen on the interface, the interface will 

immediately enter into an err-disabled state. The most likely cause was that another switch 

was plugged into the interface. If a neighboring switch recalculates its Spanning Tree 

Protocol (STP), it will not affect this switch. If a device is disconnected for a long period 

of time, the port will not enter into an err-disabled state. Although an interface that is 

flapping should enter into an err-disabled state, it is not common for this to happen from a 

flapping port.

 35.  B.  Local mode is a centralized switching mode in which all traffic is first sent to the 

wireless LAN controller (WLC) to be centrally switched to its intended destination. 

Monitor mode can be used for analysis of the radio spectrum. FlexConnect mode is a 

switching mode on the wireless access point (WAP) in which traffic is switched directly  

to the intended destination. Central mode is not a valid mode, and therefore, it is an 

invalid answer.

 36.  B.  Monitor mode will help support location-based services when used with a wireless 

LAN controller (WLC), but it will not serve client requests. FlexConnect mode is a 

switching mode on the wireless access point (WAP) in which traffic is switched directly 

to the intended destination. Local mode is a centralized switching mode in which all 

traffic is first sent to the wireless LAN controller to be centrally switched to its intended 

destination. Locate mode is not a valid mode, and therefore, it is an invalid answer.

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