单项选择题

Which of the following options best justifies why a DNS server should be run in a large network system？（）

A.To use ftp and telnet
B.To perform NFS mounts
C.To make /etc/hosts files unnecessary
D.To reduce network traffic and save bandwidth

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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

单项选择题

A host is to become part of a hierarchical naming topology. Which of the following services are required？（）

A.DHCP
B.Domain Name Service
C.Network Information Service
D.A hosts file

单项选择题

To add a TTY Terminal to Serial port 1， which of the following set of options should be chosen？（）

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