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多項選擇題

Which two protocols use UDP as a transport protocol by default?（）

A. Telnet
B. ICMP
C. DHCP
D. RIP

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多項選擇題

Which three protocols use UDP as a transport protocol by default?（）

A. HTTP
B. TFTP
C. DNS
D. SNMP
E. SMTP

多項選擇題

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