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 development of packet switching, early computer networks used leased, dedicated telephone circuits to(74) with terminals and other computers. In circuit-switched networks such as the telephone system, a complete point-to-point(75) is put together, and then communication can proceed.

A．binary

B．useful

C．digital

D．analog

[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]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 ar

[单选题]A company uses the FIFO method of accounting for its inventory. It is conte

[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

[单选题]is a method used in Critical Path Methodology for constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the logical relationships that exis

[单选题]is a method used in Critical Path Methodology for constructing a project schedule network diagram that uses boxes or rectangles，referred to as nodes，to represent activities and connects them with arrows that show the logical relationships that exist

[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

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