摘要：对于【信息安全工程师】软考考试而言，试题无疑是最重要的学习资料之一。在软考备考过程中，吃透试题、掌握试题所考知识点、熟悉试题的出题思路，对我们提升分数的效果是最明显的，通过对试题的反复练习，还可以查漏补缺。今天，给大家带来【2021年11月信息安全工程师模拟题上午（一）】部分试题的详解，一起来看看吧~



1、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 error-control mechanism at the transport level. TCP uses a sliding （73）  protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （74） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （75） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
A、path
B、window
C、frame
D、diagram

答案:B
答题解析:传输层协议有多种作用。其一是产生进程（或程序）之间的通信，TCP使用端口号来实现这个功能。传输层协议的另一个作用是形成传输层的流量和差错控制机制，TCP使用滑动窗口协议来进行流量控制，并且使用应答分组、超时机制和重传技术来实现差错控制功能。传输层还要为应用程序建立连接，应用程序向传输层发送数据流，发送方的传输层就与接收方的传输层建立对应的连接。

2、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 error-control mechanism at the transport level. TCP uses a sliding （73）  protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （74） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （75） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
A、packet
B、time
C、error
D、phase

答案:C
答题解析:传输层协议有多种作用。其一是产生进程（或程序）之间的通信，TCP使用端口号来实现这个功能。传输层协议的另一个作用是形成传输层的流量和差错控制机制，TCP使用滑动窗口协议来进行流量控制，并且使用应答分组、超时机制和重传技术来实现差错控制功能。传输层还要为应用程序建立连接，应用程序向传输层发送数据流，发送方的传输层就与接收方的传输层建立对应的连接。

3、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 error-control mechanism at the transport level. TCP uses a sliding （73）  protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （74） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （75） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
A、ports
B、streams
C、packets
D、cells

答案:B
答题解析:传输层协议有多种作用。其一是产生进程（或程序）之间的通信，TCP使用端口号来实现这个功能。传输层协议的另一个作用是形成传输层的流量和差错控制机制，TCP使用滑动窗口协议来进行流量控制，并且使用应答分组、超时机制和重传技术来实现差错控制功能。传输层还要为应用程序建立连接，应用程序向传输层发送数据流，发送方的传输层就与接收方的传输层建立对应的连接。

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