问题:
A . a drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol
B . RSVP uses DSCP to signal QoS requirements to routers
C . RSVP is a routing protocol
D . RSVP is an IP protocol that uses IP protocol ID 46, and TCP/UDP ports 3455
E . RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic
F . the flow-based approach of RSVP is ideal for large, scalable implementations such as the public internet
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