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多项选择题Which two are characteristics of RSVP?()

A、RSVP itself provides bandwidth and delay guarantees.

B、For RSVP to be end-to-end, all devices must support RSVP.

C、RSVP reservations are maintained by a centralized reservations server.

D、An RSVP compatible QoS mechanism must be used to implement guarantees according to RSVP reservations.

  • B,D
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