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多选题
What are the three models of quality of service （QoS） in a network？（）
A
Resource Reservation Protocol （RSVP）
B
first-in， first-out （FIFO）
C
best-effort
D
CBWFQ
E
IntServ
F
DiffServ
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What are three RSVP messages?()
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Whatarethethreemodelsofqualityofservice(QoS)inanetwork?()
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Which three of the following network features are methods used to achieve high availability()
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A company implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?（）A.minimum cell rate (MCR)B.quality of service (QoS)C.modulationD.packet switching exchange (PSE)E.reliable transport protocol (RTP)
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