Ccna certification Practice Tests

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 18.  What is the issue with the network in the following exhibit?

Switch A

Segment 1

Segment 2

Switch B

A.  STP is not configured and a broadcast storm is occurring.

B.  MAC table thrashing has occurred.

C.  STP is not configured and duplication of unicast frames is occurring.

D.  An STP loop has occurred.

 19.  Which command will show the number of entries in a MAC address table?

A. 

Switch#show mac address-table

B. 

Switch#show mac address-table count

C. 

Switch#show mac count

D. 

Switch#show cam count

 20.  When a switch receives a frame, what does it use to make a forwarding decision?

A.  Destination MAC address in the frame

B.  Source MAC address in the frame