單項選擇題

Which network mask is the equivalent of 255.255.248.0?（）

A. /20
B. /21
C. /22
D. /23

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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

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