多项选择题
A. NTP B. NNTP C. SMTP D. SNMP E. HTTPS F. TFTP
Which one of the following protocols uses both UDP and ...
单项选择题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
Which of the following protocols utilize UDP as the lay...
多项选择题Which of the following protocols utilize UDP as the layer 4 transport mechanism?（）
A.TACACS B.Telnet C.SMTP D.SNMP E.HTTP F.TFTP
Which of the protocols below use TCP at the transport l...
多项选择题Which of the protocols below use TCP at the transport layer?（）
A.TFTP B.SMTP C.SNMP D.FTP E.HTTP F.HTTPS
