计算机高级网络的一个问题,请高手来,,分数绝对最多

来源：百度知道 编辑：UC知道 时间：2024/07/02 15:27:38
用ethereal抓TCP三次握手，标注3行握手。抓FTP或Telnet输入的用户名和密码的过程，抓password过程,说明不安全性。

请求连接：
Internet Protocol, Src Addr: 192.168.1.100 (192.168.1.100), Dst Addr: 61.135.179.146 (61.135.179.146)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
Total Length: 52
Identification: 0x428e (17038)
Flags: 0x04 (Don't Fragment)
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x4510 (correct)
Source: 192.168.1.100 (192.168.1.100)
Destination: 61.135.179.146 (61.135.179.146)
Transmission Control Protocol, Src Port: 2049 (2049), Dst Port: http (80), Seq: 0, Ack: 0, Len: 0
Source port: 2049 (2049)
Destination port: http (80)
Sequence number: 0 (relative sequence number)
Header length: 32 bytes
Flags: 0x0002 (SYN)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set