The ping loopback hangs with no output.
Which of the following is the most likely cause？（）

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？（）

A.As the root user from serverA run the command rhost serverB
B.As the root user from serverA run the command rlogin serverB
C.As the desired user from serverB run the command rhost serverA
D.As the desired user from serverA run the command rlogin 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？（）

A.route delete default 192.168.50.1
B.access smit with the route_remove shortcut
C.chdev -l inet0 -a delroute=net，-hopcount，0，，192.168.50.1
D.flush the routing table from the console and configuring the 165.253.251.1 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？（）

A.The adapter must be taken offline prior to the firmware update.
B.The system has not been rebooted since the adapter was added to the LPAR.
C.The adapter must be assigned to the service partition prior to updating the firmware.
D.The adapter must be dynamically removed from the LPAR prior to updating the firmware.

单项选择题HowshouldaDNSclientbeconfigured？（）

A.Edit the /etc/netsvc.conf file to have a nameserver and a domain search order.
B.Edit the /etc/resolv.conf file to have a nameserver and a domain search order.
C.Edit the /etc/resolv.conf file to have a nameserver， domain， and domain search order. 
D.Edit the /etc/netsvc.conf file to have a nameserver， domain， and domain search order.

单项选择题An administrator needs to configure a server （192.168.22.22） as a temporary solution for an NTP master that has stopped working. What is the process for configuring the NTP master？（）

A.Edit the /etc/ntp.conf file changing the server line to ’server 127.127.1.0’ and add the line ’fudge 127.127.1.0 stratum 0’， and then refresh the daemon.
B.Edit the /etc/ntp.conf file changing the server line to ’server 127.127.1.0’ and add the line ’master 127.127.1.0 stratum 0’， and then refresh the daemon.
C.Edit the /etc/ntp.conf file changing the server line to ’server 192.168.22.22’ and add the line ’fudge 192.168.22.22 stratum 0’， and then refresh the daemon.
D.Edit the /etc/ntp.conf file changing the server line to ’server 192.168.22.22’ and add the line ’master 192.168.22.22 stratum 0’， and then refresh the daemon.