Ccna certification Practice Tests

 138.  C.  The default bridge priority for STP is 32,768. All of the other options are incorrect.

 139.  D.  The root bridge always has all of its ports in a designated mode or forwarding mode. 

If there are redundant links, the adjacent switch to the designated port on the root bridge 

must be a non-designated or blocking state. A designated port is always in a forwarding 

state. Every switch will not have at least one designated port; it is safe to say that every 

switch will have at least one port in a forwarding mode. Every switch will not have at least 

one non-designated port since a switch might only have one link back to the root bridge.

 140.  A.  A backup port is a port in a discarding state. It receives BPDUs from another port on 

the same switch. If the forwarding port fails, then the backup port will become designated 

so that connectivity to the segment can be restored. A backup port is another port on the 

same switch that receives BPDUs from itself. A backup port is placed into a blocking state 

and not a forwarding state.

D

RP

BP

RP

RP

D

D

D

BPDUs

D

RP

D

Failed

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Chapter 2: Network Access (Domain 2)