As shown in the figure, the four routers in the same LAN run IS-IS, and R1 is DIS. Then R2, R3  R4 respectively establish adjacency relationship with R1, and R2, R3, R4 do not establish adjacency relationship.

 As shown in the figure, the four routers in the same LAN run IS-IS, and R1 is DIS. Then R2, R3  R4 respectively establish adjacency relationship with R1, and R2, R3, R4 do not establish adjacency relationship.

A . True
B. False

Answer: B

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