根据下面的文字资料回答 42~43 题 用户A与用户B通过卫星链路通信时,传播延迟为540ms,假设数据速率是64Kbit/s,帧长4000bit,若采用停等控制协议通信,则最大链路利用率为(1 );若采用后退N帧ARQ协议通信,发送窗口为8,则最大链路利用率可以达到(2 )。第42题:文中(1 )处正确的答案是()。
A.0.058
B.0.116
C.0.188
D.0.231
A.0.058
B.0.116
C.0.188
D.0.231
A.时分多路
B.空分多路
C.波分多路
D.频分多路
A.应用层
B.传输层
C.IP层
D.网络接口层
根据下面的文字资料回答 66~70 题
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 oftenworks poorly,because in the(1 )between sending the
notification and notification arriving at the source,thousands of
additional(2 )may aITive.In ATM network,a major tool for
preventing(3 )is(4 )control.when a host wants a new virtual(5 ),it must
describe the traffic to be offered and the service expected.
第66题:文中(1 )处正确的答案是()。
A.interval
B.time
C.slot
D.delay
A.2
B.3
C.4
D.5
A.费用
B.灵活性
C.可靠性
D.环型
根据下面的文字资料回答 63~67 题
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 oftenworks poorly,because in the(1 )between sending the
notification and notification arriving at the source,thousands of
additional(2 )may aITive.In ATM network,a major tool for
preventing(3 )is(4 )control.when a host wants a new virtual(5 ),it must
describe the traffic to be offered and the service expected.
第63题:文中(1 )处正确的答案是()。
A.interval
B.time
C.slot
D.delay
A.近端串扰
B.拓扑结构
C.开路或短路
D.错对
A.winipcfg
B.ipconfig
C.ipcfg
D.winipconfig
A.远程访问
B.远程网络监控
C.远程登录
D.远程控制