单项选择题
A.The loopback interface is down and resolv.conf is configured.
B.The loopback is not in /etc/hosts and resolv.conf is configured.
C.The loopback interface is down and resolv.conf is not configured.
D.The loopback is not in /etc/hosts and resolv.conf is not configured.
单项选择题 An administrator has set up serverA and serverB to use the /etc/hosts.equiv file so that applications on serverA can remotely run commands on serverB. Which command will verify if a new user from serverA is trusted on serverB？（）
单项选择题 A system is experiencing packet routing problems，when the administrator runs ’netstat -nr’ the following default routes are displayed： default165.253.251.1UG51601304 en8-- default192.168.50.1UGH01590450 en4-- Assuming the first route is correct，how can the administrator remove the incorrect default route？（）
单项选择题 An administrator issued a command to update the firmware of an Ethernet adapter on a partitioned system， but received an error. What is the most likely cause of the problem？（）