单项选择题
When dividing an existing Class B network into 2 subnets of 32，766 hosts each， which of the following subnet masks should be used？（）
A.128.0.0.0
B.255.128.0.0
C.255.254.0.0
D.255.255.128.0
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Ahostistobecomepartofahierarchicalnamingtopology.Whichofthefollowingservicesarerequired？（）
A.DHCP
B.Domain Name Service
C.Network Information Service
D.A hosts file -
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ToaddaTTYTerminaltoSerialport1，whichofthefollowingsetofoptionsshouldbechosen？（）
A.tty rs232 Asynchronous Terminal then sa1 Available 01-S2 Standard I/O Serial Port
B.tty rs422 Asynchronous Terminal then sa1 Available 01-S2 Standard I/O Serial Port
C.tty rs232 Asynchronous Terminal then sa0 Available 01-S1 Standard I/O Serial Port
D.tty rs422 Asynchronous Terminal then sa0 Available 01-S1 Standard I/O Serial Port -
单项选择题
Whichcommandcanbeusedtomodifynetworkoptions？（）
A.netstat
B.ifconfig
C.chdev
D.no
