主机 A 向主机 B 连续发送了两个 TCP 报,其序号分别为 70 和 100 。试问: ( 1 )第一个报携带了多少个字节的数据? ( 2 )主机 B 收到第一个报后发回的确认中的确认号应当是多少? ( 3 )如果主机 B 收到第二个报后发回的确认中的确认号是 180 ,试问 A 发送的第二个报中的数据有多少字节? ( 4 )如果 A 发送的第一个报丢失了,但第二个报到达了 B 。 B 在第二个报到达后向 A 发送确认。试问这个确认号多少?
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