A transport layer protocol usually has several res

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 transpt 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 th transorort layer at the receiving end to wait until all the different units belong to th same process have arrived,check and pass those that are(75) free ,and deliver them to the receiving process as a stream．

解析：

第一空：题目中提到UDP使用数字来实现进程间通信，因此应该填写“sending”，即发送数字来实现通信。因此答案为A。
第二空：题目中提到UDP没有流量控制机制和接收数据包的确认机制，因此应该填写“确认”，即确认接收数据包的功能缺失。因此答案为缺失。由于题目中并没有给出选项，因此无法选择正确答案。
第三空：题目中提到传输层需要提供连接机制，而数据必须能够发送到传输层，因此应该填写“数据”，即数据必须能够发送到传输层以建立连接。这里没有给出具体的选项供选择，因此无法确定正确答案。但通常情况下，数据发送方需要能够与接收方建立连接，因此与发送相关的选项可能是正确的。
第四空：题目中提到建立连接的职责在传输层的发送端，因此应该填写“发送”，即发送端的传输层负责建立连接。因此答案为D receiving（接收）是不正确的。因此正确答案为A（发送）。
第五空：题目中提到接收端的传输层需要等待同一进程的所有不同单元到达后进行检查和传递，因此需要填写与检查和传递相关的词汇。由于没有给出具体的选项供选择，无法确定正确答案。但是根据上下文理解，可能是需要检查并传递正确的数据包，因此与“正确”相关的选项可能是正确答案。

答案：

解析：

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