单选

Flow control is a function that prevents network congestion by ensuring that _( )_ do not overwhelm_( )_ with data.There are three commonly used methods for handling network congestion._( )_is used by network devices to temporarily store bursts of excess data in memory until they can be processed._( )_ are used by receiving devices to help prevent their buffers from overflowing._( )_ is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.

  • A.transmitting devices
  • B.transmitted devices
  • C.receiving devices
  • D.received devices
  • A.transmitting devices
  • B.transmitted devices
  • C.receiving devices
  • D.received devices
  • A.Buffer
  • B.Source-quench messages
  • C.window
  • D.Windowing
  • E.Buffering
  • A.Buffer
  • B.Source-quench messages
  • C.window
  • D.Windowing
  • E.Buffering
  • A.Buffer
  • B.Source-quench messages
  • C.window
  • D.Windowing
  • E.Buffering
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SLIP是一种面向_( )_的协议,它具有_( )_特点。PPP是基于SLIP发展而来的串行通讯协议,该协议_( )_。PPP协议通过_( )_来建立、配置和测试数据链路连接。动态获取IP地址是通过_( )_实现的。

  • A.比特
  • B.字节
  • C.帧
  • D.数据段
  • A.无差错检验和支持多种协议
  • B.有差错检验和仅支持IP
  • C.有差错检验和支持多种协议
  • D.无差错检验和仅支持IP
  • A.仅支持异步链路
  • B.支持异步链路和同步链路

基于TCP/IP的互联网服务中,IP协议提供主机之间的_( )_分组传输服务。TCP协议提供端口之间的_( )_报文传输服务;UDP属于_( )_协议,从其下一层接收了数据以后,根据_( )_将之分解成UDP数据报;应用层的_( )_协议可以使用UDP或TCP协议传输数据。

  • A.可靠的面向连接的
  • B.不可靠的面向连接的
  • C.可靠的无连接的
  • D.不可靠的无连接的
  • A.可靠的面向连接的
  • B.不可靠的面向连接的
  • C.可靠的无连接的
  • D.不可靠的无连接的
  • A.数据链路层
  • B.网络层
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