In a DNS environment， the zone file that maps hostnames to IP address （sometimes called the named.hosts file）， is created on which of the following servers？（）

单项选择题WhatisthefirststepinsettingupaPrimaryDomainNameServer？（）

A.Create the cache file
B.Create the IP zone file
C.Create the named.boot file
D.Create the name zone file

单项选择题Whichofthefollowingfilesshouldbeeditedsothattftpdisrunningwiththe-noption？（）

A. etc/services
B./etc/inetd.conf
C. /etc/tftpd.conf
D. /etc/rc.net

单项选择题AusercannotpinganyotherhostnamesfromanAIXmachine.Theerrorreceivedis hostnameearthNOTFOUND .Whichofthefollowingfilesismostlikelyconfiguredincorrectly？（）

A./etc/resolv.conf
B./etc/rc.tcpip
C./etc/aliases
D./etc/hosts.equiv

单项选择题Whatisthedefaultamountoftimethatanautomounteddirectorystaysmounted？（）

A.1minute
B.5minutes
C.10minutes
D.30minutes

单项选择题AnAIXserverisconfiguredwithastaticIPaddressbutthesystemadministratorwantstheservertogiveoutIPaddressesforclientswhowanttousethedynamichostconfigurationprotocolinsteadofstaticIPaddresses.Howisthisaccomplished？（）

A.Use SMIT to have the server use DHCP instead of a static address
B.Edit /etc/rc.tcpip and start the dhcpsd daemon
C.Use the network options command to enable ipforwarding
D.Edit /etc/rc.net to set network options back to default