When a switch receives a frame and the source MAC address is not found in the switching table, what action will be taken by the switch to process the incoming frame? | CCNA

     A.    The switch will request that the sending node resend the frame.
     B.    The switch will issue an ARP request to confirm that the source exists. 
     C.    The switch will map the source MAC address to the port on which it was received. 
     D.    The switch ends an acknowledgement frame to the source MAC of this incoming frame.

ANS: C