Which three statements about the designated router election in IS-IS are true? (Choose three.)
A.
If the IS-IS DR fails, a new DR is elected.
B.
The IS-IS DR will preempt. If a new router with better priority is added, it just becomes active in
the network.
C.
If there is a tie in DR priority, the router with a higher IP address wins.
D.
If there is a tie in DR priority, the router with a higher MAC address wins.
E.
If the DR fails, the BDR is promoted as the DR.
F.
The DR is optional in a point-to-point network.
“First, ISIS does not elect a Backup Designated Router. If the ISIS DR fails, a new DR is elected. Second, the ISIS DR is not as stable as the OSPF DR…”