单选题Which of the following is true concerning Frame Relay multipoint subinterfaces?（）AAn IP address is required on the physical interface of the central router.BAll routers are required to be fully meshed.CAll routers must be in the same subnet to forward routing updates and broadcasts.DMultipoint is the default configuration for Frame Relay subinterfaces.
单选题
Which of the following is true concerning Frame Relay multipoint subinterfaces?（）
A
An IP address is required on the physical interface of the central router.
B
All routers are required to be fully meshed.
C
All routers must be in the same subnet to forward routing updates and broadcasts.
D
Multipoint is the default configuration for Frame Relay subinterfaces.
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