在浏览器地址栏输入ftp://ftp.tsinghua.edu.cn/进行访问时，首先执行的操作是（ ）
- A.域名解析
- B.建立控制命令连接
- C.建立文件传输连接
- D.发送FTP命令
正确答案及解析
正确答案
解析
由于在地址栏输入的是FTP加主机域名的形式，因此要建立FTP连接首先得解析出目标主机的IP地址，因此最先执行的就是通过域名解析获取的域名对应的IP地址。
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