2. 计算机
  3. Which of the following correctly describe steps in the OSI data encapsulation process?

Which of the following correctly describe steps in the OSI data encapsulation process?

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问题 Which of the following correctly describe steps in the OSI data encapsulation process?
选项 A、        The transport layer divides a data stream into segments and may add reliability and flow control information．
B、        The data link layer adds physical source and destination addresses and an FCS to the segment．
C、        Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information．
D、        Packets are created when the network layer adds Layer 3 addresses and control information to a segment．
E、        The presentation layer translates bits into voltages for transmission across the physical link．
答案A,D
解析 传输层将数据分段，并且加入flow control等信息。在网络层就将数据进行打包，并加上ip包头，链路层。将包进行成Frame，封装二层头部
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