單項(xiàng)選擇題Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin?()

A. presentation
B. session
C. transport
D. network
E. physical


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2.單項(xiàng)選擇題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. modulation
D. packet switching exchange (PSE)
E. reliable transport protocol (RTP)

4.單項(xiàng)選擇題When configuring a serial interface on a router, what is the default encapsulation?()

A. atm-dxi
B. frame-relay
C. hdlc
D. lapb
E. ppp

5.單項(xiàng)選擇題Which command displays CPU utilization?()

A. show protocols
B. show process
C. show system
D. show version

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