单项选择题
A.nfsstat -s
B.lssrc -s named
C.ls -l /etc/resolv.conf
D.nslookup hostname
单项选择题 Toenableattyporttobeusedforacusessionwhatmustbedonetothesystem？（）
单项选择题 Which of the following commands should be used to open a tty port configured in the /etc/uucp/Devices file as： Direct tty2 - 9600 direct in debug mode， ignoring modem control signal data carrier detect （DCD）？（）
单项选择题 Whichcommandwillshownetworkstatisticssuchaskernelmallocandmblkfailures？（）