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單項(xiàng)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(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)

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2.單項(xiàng)選擇題指定邏輯通道備份主接口使用的命令是（）。

A.standby logic-channel logic-channel-number [priority]
B.standby nterface interface-type interface-number
C.logic-channel logic-channel-number
D.dialer map protocol next-hop-address dialer-string[logic-channel logic-channel-number]

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3.多項(xiàng)選擇題Which two statements best describe the wireless security standard that is defined by WPA (Choose two.)（）。

A.It specifies use of a static encryption key that must be changed frequently to enhance security
B.It requires use of an open authentication method
C.It specifies the use of dynamic encryption keys that change each time a client establishes a connection
D.It requires that all access points and wireless devices use the same encryption key
E.It includes authentication by PSK

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4.單項(xiàng)選擇題What must be set correctly when configuring a serial interface so that higher-level protocols calculate the best route?（）

A.bandwidth
B.delay
C.load
D.reliability

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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

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