單項(xiàng)選擇題Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching?()

A. LAN
B. routing
C. WAN
D. network


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3.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)

5.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