在数据链路层上处理发送方和接收方的收发帧同步问题的是
A. 差错控制
B. 流量控制
C. 成帧
D. 介质访问控制
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累计确认机制的目的是:()
A. 提高安全性
B. 保证信息正确
C. 提高响应速度
D. 节省带宽
流量控制实际上是对()的控制
A. 发送方的数据流量
B. 接收方的数据流量
C. 发送,接收方的数据流量
D. 链路上任意两结点的数据流量
局域网交换机实现的主要功能在( )
A. 物理层和数据链路层
B. 数据链路层和网络层
C. 数据链路层网络层
D. 数据链路层和应用层
Lesson 22 Blank-filling-1 P: WH GND, CCA982 1C: CCA982, taxi to the terminal via taxiway A and J, be advised the taxiway 2 in the first portion of taxiway A is off, taxi with cautionP: Taxiway A and J, CCA982P: Ground the taxiway seems very slippery, do you have any 3C: it must be 4 we has such a report an hour ago, caution the 5 on the left side of the 6P: CCA982, lookingP: we have just 7 the taxiway on the right side of 8 , right 9 stuck in the mud we cannot seem to get back to the paving, request a tug and 10C: we will send a tug and 11 in a few minutes.