A systems administrator installs a simple package, but the Linux system returns the following error: rpmdb open fails. To verify if there is a problem in the RPM database, the systems administrator runs the following command:

Which of the following commands should the systems administrator run NEXT to resolve this issue?

• A.cd/var/lib/rpm; rm -f _db*; rpm --rebuilddb; yum clean all
• B.cd/var/lib/rpm; rpm -qd; rpm --rebuilddb; yum clean all
• C.cd/var/lib/rpm; rpm --rebuilddb ; rm -f _db*; yum clean all
• D.cd/var/lib/rpm; rpm -qa; rm -f _db*; yum clean all

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An administrator completed the configuration of the in-addr.arpa zone files for an organization.
Which of the following commands should the administrator use to verify the configuration is working as expected?

• A.dig -x 192.168.1.100
• B.host in-add.arpa
• C.ping -n 192.168.1.100
• D.tracepath -n 192.168.1.100
• E.nslookup in-addr.arpa

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A systems administrator wants to check the log of changes made to a Git repository. Which of the following commands can be used for this task?

• A.git branch list
• B.git reflog
• C.git commit log
• D.git push log

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All users are reporting that they cannot connect to the SFTP server. The administrator runs a scan:

Which of the following would allow the administrator to fix the problem?

• A.Allow SFTP connections on port 22 using /etc/sysconfig/iptables.
• B.Allow SFTP connections on port 20 and 21 using /etc/sysconfig/iptables.
• C.Allow SFTP connections on port 25 using /etc/sysconfig/iptables.
• D.Allow SFTP connections on port 1456 using /etc/sysconfig/iptables.

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A systems administrator receives a report that the web server is not running after a planned system reboot.
After starting the web server manually, which of the following commands should the administrator issue to ensure the web server starts at boot time?

• A.systemctl service on
• B.systemctl enable <name>.service
• C.systemctl service enable
• D.systemctl on <name>.service

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