單項選擇題Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication? ()

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


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1.單項選擇題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)

3.單項選擇題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

4.單項選擇題Which command displays CPU utilization?()

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

5.單項選擇題Which command is used to debug a ping command?()

A. debug icmp
B. debug ip icmp
C. debug tcp
D. debug packet

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