2023-08-14
快速以太网标准100Base-TX规定的传输介质是
2023-09-01 从业资格其它
设信道带宽为5000Hz,采用PCM编码,采样周期为125μs,每个样本量化为256个等级,则信道的数据速率为( )。
CHAP协议是PPP链路中采用的一种身份认证协议,这种协议采用三次握手方式周期性的验证通信对方的身份,当认证服务器发出一个挑战报文时,则终端就计算该报文的( )并把结果返回服务器。
数据链路协议HDLC是一种( )。
E1载波的控制开销占( ),E1基本帧的传送时间为(19)
E1载波的控制开销占(18),E1基本帧的传送时间为( )
In low-speed network,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down.In high-speed networks,this approach often works poorly,because in the(71)between sending the notification and notification arriving at the source,thousands of additional(72)may arrive.In ATM network,a major tool for preventing(73)is(74)control.When a host wants a new virtual(75),it must describe the traffic to be offered and the service expected.
( )is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
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