Which two statements are true about IS-IS router behavior? (Choose two.)
A.
An IS-IS router attached to a broadcast, multi-access network establishes adjacencies with all
of its neighbors on the network.
B.
An IS-IS router attached to a broadcast, multi-access network establishes an adjacency only to
the network’s elected DIS.
C.
If an IS-IS DIS attached to a broadcast, multi-access network fails, the backup DIS assumes
the primary DIS role.
D.
If an IS-IS DIS attached to a broadcast, multi-access network fails, a new DIS is elected.
Unlike OSPF, however, an IS-IS router attached to a broadcast, multi-access network establishes adjacencies with all of its neighbors on the network, not just the DIS. Each router multicasts its link-state PDUs to all of its neighbors, and the DIS uses a system of PDUs—named sequence number PDUs—to ensure that the flooding of link-state PDUs is reliable.
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