题目内容

主机A向主机B发送一个SYN=1,seq=11220的TCP段,期望与主机B建立TCP连接,若主机B接受该连接请求,则主机B向主机A发送的正确的TCP段可能是

A. SYN=0,ACK=0,seq=11221,ack=11221
B. SYN=1,ACK=1,seq=11220,ack=11220
C. SYN=1,ACK=1,seq=11221,ack=11221
D. SYN=0,ACK=0,seq=11220,ack=11220

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主机A与主机B之间已建立一个TCP连接,双方持续有数据传输,且数据无差错与丢失,若A收到一个来自B的TCP段,该段序号为1913,确认号为2046,有效载荷为100字节,则A立即发送给B的TCP段的序号和确认号分别是?

A. 2046,2012
B. 2046,2013
C. 2047,2012
D. 2047,2013

下列关于UDP协议的叙述中,正确的是Ⅰ提供无连接服务,Ⅱ提供复用/分用服务Ⅲ通过差错校验,保障可靠数据传输

A. Ⅰ
B. ⅠⅡ
C. ⅡⅢ
D. Ⅰ ⅡⅢ

31.Certain cell phones provide users with the option of voice dialling. All that the user has to do is give a command stating the name of the person they would like to call, (e.g., "Call Roger") and the cell phone automatically dials the person's number. Which of the following physiological innovations do such cell phones utilize?

A.VoIP
B.ASR
C.CAVE
D.RFID

32.Some in-car GPS navigation systems are voice activated. All that a driver has to do is state the name of one's destination or dictate an address and the system automatically instructs the driver on how to get there. Which of the following physiological innovations do such GPS systems utilize?

A.VoIP
B.CAVE
C.RFID
D.ASR

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