FTP客户上传文件时，通过服务器20端口建立的连接是（ ），FTP客户端应用进程的端口可以为（ ）。
问题1选项
A.建立在TCP之上的控制连接
B.建立在TCP之上的数据连接
C.建立在UDP之上的控制连接
D.建立在UDP之上的数据连接
问题2选项
A.20
B.21
C.80
D.4155
正确答案及解析
正确答案
解析
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