A transport layer protocol usually has several responsibilities. One is to create a process-to-process communication; UDP uses （71） numbers to accomplish this. Another responsibility is to provide control mechanisms at the transport level. UDP does this task at a very minimal level. There is no flow control mechanism and there is no （72） for received packet. UDP,however, does provide error control to some extent. If UDP detects an error in the received packet, it will silently drop it．

The transport layer also provides a connection mechanism for the processes. The （73） must be able to send streams of data to the transport layer. It is the responsibility of the transport layer at （74） station to make the connection with the receiver, chop the stream into transportable units,number them, and send them one by one. It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived, check and pass those that are （75） free, and deliver them to the receiving process as a stream.

（71）

A．hop

B．port

C．route

D．packet

（72）

A．connection

B．window

C．acknowledgement

D．destination

（73）

A．jobs

B．processes

C．programs

D．users

（74）

A．sending

B．routing

C．switching

D．receiving

（75）

A．call

B．state

C．cost

D．error

[单选题] A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port （71） to accomplish this. Another responsibility of a transport layer protocol is to create a （72） and er

[单选题]A． transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port (71) to accomplish this. Another responsibility of a transport layer protocol is to create a (72) and er

[单选题,共用题干题] A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) an

[单选题]The TCP protocolis a （）layer protocol.A . physicalB . networkC . transportD . application

[单选题]Multimodal transport refers to a transport system usually operated by oneca

[单选题]Multimodal transport refers to a transport system usually operated by oneca

[多选题]Multimodal transport has the advantages such as（ ）.A.reducing the burden of

[多选题]Multimodal transport has the advantages such as（ ）.A.reducing the burden of

[单选题]A．lthough a ship usually has repair in a shipyard, ________ is also necessaryA．the general repair on boardB．the voyage repairC．the annual repairD．the dock repair

[单选题]The starting air system usually has （） to prevent starting if anything is not in order.A . stop valvesB . interlocksC . non-return valvesD . air vent