你可能感興趣的試題

A. Users in SW1 can ping SW2 but not vice versa.
B. Users in SW2 can ping SW1 but not vice versa.
C. Users in SW1 and SW2 can ping each other.
D. Users in SW1 and SW2 cannot ping each other.

A.to prevent multicast packets from looping
B.to prevent PIM packets from looping
C.to instruct PIM where to send a （*， G） or （S， G） join message
D.to prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage