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--default 192.168.50.1UGH01590450 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 thefirmware of an Ethernet adapter on a partitioned system, but received an error. What is the most likely cause of the problem?（）