单项选择题
Which network mask is the equivalent of 255.255.248.0?（）
A. /20
B. /21
C. /22
D. /23
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相关考题
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多项选择题
Which two protocols use UDP as a transport protocol by default?（）
A. Telnet
B. ICMP
C. DHCP
D. RIP -
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 -
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
