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The usual way to ensure reliable delivery is to provide the (1) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (2) frame bearing positive or negative (3) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the the frame has arrived safely. On the other hand, a negative acknowledgement means that something has gone w
第11题: E1载波把32个信道按 (1) 方式复用在一条2.048Mb/s的高速信道上,每条话音信道的数据速率是 (2) 。
(1)A、时分多路
B、空分多路
C、波分多路
D、频分多路
(2)A、56kb/s
B、64kb/s
C、128kb/s
D、512kb/s
在进行域名解析过程中,当主域名服务器查找不到IP地址时,由(34)负责域名解析。
A.本地缓存
B.辅域名服务器
C.根域名服务器
D.转发域名服务器
假设系统有n个进程共享资源R,且资源R的可用数为3,其中n≥3 。若采用PV操作,则信号量S的取值范围应为(9) 。
A.-1~n-1
B.B.-3~3
C.C.-(n-3)~3
D.D.-(n-l)~1