Which statement is true regarding the IS-IS designated intermediate system (DIS)?
A.
IS-IS supports a backup DIS mechanism to provide rapid failover in the event of a DIS
failure.
B.
On a broadcast network, adjacencies are formed only between the non-DIS nodes and
the DIS to help reduce adjacency overhead.
C.
The DIS function is used on both broadcast and point-to-point link types.
D.
The DIS function is used only on broadcast or multi-access networks.