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多項(xiàng)選擇題

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

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

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多項(xiàng)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

多項(xiàng)選擇題

Which two characteristics describe the UDP protocol?（）

A. limited error checking
B. defined timers
C. no recovery mechanisms
D. three-way handshake