计网第三章作业

Chapter 3 注:括弧中标题号为第四版教材中对应得习题号1.(R14)Suppose Host A sends two TCP segments back to back to Host B over a TCP connection、 The first segment has sequence number 90; the second has sequence number 110、a、 How much data is in the first segment?b 、 Suppose that the first segment is lost but the second segment arrives at B 、 In the acknowledgment that Host B sends to Host A, what will be the acknowledgment number?答:a.[90,109]=20bytesb.ack number=90,对第一个报文段确认2.(R15)True or false?a 、 The size of the TCP RcvWindow never changes throughout the duration of the connection、b 、 suppose Host A is sending Host B a large a TCP connection 、 The number of unacknowledged bytes that A sends cannot exceed the size of the receive buffer、c、 Host A is sending Host B a large a TCP connection、 Assume Host B has no data to send Host A、 Host B will not send acknowledgments to Host A because Host B cannot piggyback the acknowledgment on data、d、 The TCP segment has a field in its header for RcvWindow、e、 Suppose Host A is sending a large Host B over a TCP connection、 If the sequence number for a segment of this connection is m, then the sequence number for the subsequent segment will necessarily be m + 1、f、 Suppose that the last SampleRTT in a TCP connection is equal to 1 sec、 The current value of TimeoutInterval for the connection will necessarily be>=1 sec、g、 Suppose Host A sends one segment with sequence number 38 and 4 bytes of data over a TCP connection to Host B、 In this same segment the acknowledgment number is necessarily 42、答:a、Fb、Tc、F:即使没有数据传送,也会进行单独确认d、Te、F:按字节编号,不按报文段编号f、Fg、F:B->A 得确认号不一定为 38+4=423.(R17)True or false? C...