计算机网络技术第4章 因特网及其应用.ppt

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 第*页 IMG SRC=portrait.gif HEIGHT=100 WIDTH=65 插入图像 插入的图像文件名是 portrait.gif 高度是 100 像素 宽度是 65 像素 第*页 小 结 因特网的编址机制 域名服务 （域名、域名服务器、域名系统） *远程登录（Telnet） 电子邮件 （系统的组成、 SMTP、POP3、IMAP、MIME协议 、存储转发过程） *文件传输（FTP） 万维网 （超文本、超媒体、统一资源定位器URL 、 HTTP协议、万维网的缓存机制） 第*页 第四章 作业 习题 2. 3. 6. 8. 13. 14 . 19 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 第*页 [01] ftp [02] connected to [03] 220 nic FTP server (Sunos 4.1)ready. [04] Name: anonymous [05] 331 Guest login ok, send ident as password. [06] Password: abc@ [07] 230 Guest login ok, access restrictions apply. [08] ftp cd rfc [09] 250 CWD command successful. [10] ftp get rfc1261.txt nicinfo [11] 200 PORT command successful. [12] 150 ASCII data connection for rfc1261.txt (7,1401) (4318 bytes). [13] 226 ASCII Transfer complete. local: nicinfo remote: rfc1261.txt 4488 bytes received in 15 seconds (0.3 Kbytes/s). [14] ftp quit [15] 221 Goodbye. [13] 数字 226 是“释放数据连接”。 现在一个新的本地文件已产生。 第*页 [01] ftp [02] connected to [03] 220 nic FTP server (Sunos 4.1)ready. [04] Name: anonymous [05] 331 Guest login ok, send ident as password. [06] Password: abc@ [07] 230 Guest login ok, access restrictions apply. [08] ftp cd rfc [09] 250 CWD command successful. [10] ftp get rfc1261.txt nicinfo [11] 200 PORT command successful. [12] 150 ASCII data connection for rfc1261.txt (7,1401) (4318 bytes). [13] 226 ASCII Transfer complete. local: nicinfo remote: rfc1261.txt 4488 bytes received in 15 seconds (0.3 Kbytes/s). [14] ftp quit [15] 221 Goodbye. [14] 用户键入退出命令。 第*页 [01] ftp [02] connected to [03] 220 nic FTP server (Sunos 4.1)ready. [04] Name: anonymous [05] 331 Guest login ok, send ident as password. [06] Password: abc@ [07] 230 Guest login ok, access restrictions apply. [08] ftp cd rfc [09] 250 CWD command successful. [10] ftp get rfc1261.txt nicinfo [11] 200 PORT command successful. [12] 1