多选题Which two statements regarding the IS-IS DIS election process are true？ （）AA priority of 0 will prevent a router from becoming a DIS.BIf the DIS becomes unavailable the backup DIS is promoted to DIS.CAdding a router with a higher priority than the current DIS will result in the new router becoming DIS.DSeparate L1 and L2 election processes are held on a brodcast network.EL1 routers on a broadcast network only establish adjacencies with the DIS.FIf there is a tie based on priority，the router whose attached interface has the lowest MAC address becomes the DIS.
多选题
Which two statements regarding the IS-IS DIS election process are true？ （）
A
A priority of 0 will prevent a router from becoming a DIS.
B
If the DIS becomes unavailable the backup DIS is promoted to DIS.
C
Adding a router with a higher priority than the current DIS will result in the new router becoming DIS.
D
Separate L1 and L2 election processes are held on a brodcast network.
E
L1 routers on a broadcast network only establish adjacencies with the DIS.
F
If there is a tie based on priority，the router whose attached interface has the lowest MAC address becomes the DIS.
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