What are the usable hosts on the .128.0 19 network?（）……

单项选择题You must segment your internal 24 network into a minimum of 12 subnets, each containing a minimum of 12 hosts. Which network mask do you use?（）

A. /26
B. /27
C. /28
D. /29

单项选择题You have been assigned the 24 network and need to segment it into at least 60 subnets. Which network mask meets this requirement?（）

A. /27
B. /28
C. /29
D. /30

单项选择题Which network mask is the equivalent of 255.255.248.0?（）

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

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