单项选择题
A. route
B. netstat
C. iptrace
D. traceroute
单项选择题 Whichofthefollowingstatementsbestdescribeserrorlogging?（）
单项选择题 Ithasbeendeterminedthatprintjobsfromanapplicationarenotbeingremovedfromthesystemaftertheyhavebeenprinted.Toremovethesejobsfromthe/var/spooldirectory,whichcronentrywillremovefilesmorethan7daysold?（）
单项选择题 Whichofthefollowingentriesshouldbeaddedtothesyslog.conffiletocaptureinformationtotroubleshootaproblemreportedwithe-mail?（）