单选题Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）AFTPBTFTPCSMTPDTelnetEDNS
单选题
Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）
A
FTP
B
TFTP
C
SMTP
D
Telnet
E
DNS
参考解析
解析：
暂无解析
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