单项选择题
A. /20 B. /21 C. /22 D. /23
Which two protocols use UDP as a transport protocol by ...
多项选择题Which two protocols use UDP as a transport protocol by default?（）
A. Telnet B. ICMP C. DHCP D. RIP
Which three protocols use UDP as a transport protocol b...
多项选择题Which three protocols use UDP as a transport protocol by default?（）
A. HTTP B. TFTP C. DNS D. SNMP E. SMTP
You have been asked to develop an application that uses...
多项选择题You have been asked to develop an application that uses only connection-oriented protocols. Which two protocols can you use?（）
A. PPP B. UDP C. TCP D. ICMP
