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

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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

多项选择题

Which two characteristics describe the UDP protocol?（）

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

多项选择题

Which two statements are true of a network mask?（）

A. A subnet mask specifies the portion of an IP address that is in a binary format.
B. A subnet mask specifies the portion of an IP address that is in a decimal format.
C. A subnet mask specifies the portion of an IP address that represents a network prefix.
D. A subnet mask specifies the portion of an IP address that represents network hosts.