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.
