Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(44)for the(45)of time they use the net-work.

A．to

B．for

C．than

D．only

[单选题]Packet-switching wireless networks are preferable(66)when transmissions are(67)bemuse of the way charges are(68)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are

[单选题]Wireless telecommunications networks are generally implemented and administered using（）communication.This implementation takes place at the （）level of OSI model network structure.A．microwave B．radio C．FM D．AMA．physical B．link C．network D．transport

[单选题]Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communication(72) as they become available, and then reassembling the packets(73) they arrive at their destination. Prior to the

[单选题]Packet Uplink Ack/Nack，Packet Downlink Ack/Nack属于那一层的信令：（）A . Layer3三层信令B . RLC/MAC层信令C . LLC层信令D . SNDCP层信令

[名词解释] Switching交换

[名词解释] packet包

[试题]() switching was invented in the late 1960s for data communications.A．Frame B．Link C．Packet D．Line

[试题]C．ircuit Switching is problematic because data communications is（），that is， it is typically dominated by short bursts of activity with long periods of（）.A．reliable B．bursty C．digital D．continuous A．latency B．transmission C．delay D．inactivity

[单选题]Windows Wireless Zero Configuration Utility可以建立以下哪些企业级profile?(选择所有正确答案)A．802.1xB．WPA/WPA2/CCKMC．WEP静态密钥D．以上都不对A．B．C．D．

[单选题]A．n internet is a combination of networks connected by()A．modemsB．routersC．switchesD．computers