單項選擇題

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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單項選擇題

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

單項選擇題

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