An RSVP session is maintained with the periodic exchange of which two message types?（） (Choose two.)

A. reverse path of the RRO
B. least cost to the ingress router
C. shortest path to the egress router
D. reverse path of the path vector TLV

A. IP routing
B. data security
C. label distribution
D. data compression

A. It is the size of the RSVP hello packet
B. It is how long it maintains RSVP neighbors
C. It is the length of time between RSVP hello packets
D. It is how long the router waits before declaring a router to be down