After installing the package 'postfix', what command would you run in order to ensure that Postfix is started on reboot?

• A.enable postfix on
• B.postfix -onboot yes
• C./etc/init.d/enable postfix
• D.svstemctl enable postfix

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Which measures can be taken to prevent unauthorized access to cloud instances and services?

• A.Replicate data to another datacenter, use multi-factor authentication, and encrypt data on storage systems.
• B.Implement firewall rules, authentication, authorization, and encrypted protocols.
• C.Implement block-chain tokens, use encrypted protocols, and encrypt the data on storage systems.
• D.Use multi-factor authentication, implement firewall rules, and back up data off-site.

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A recurring task must be automated by scheduling the script located at /usr/local/bin/cleanup.sh to run every Friday at 11:00 PM. Which of the following crontab entries will schedule the job correctly?

• A.0 11 * * fri /usr/local/bin/cleanup.sh
• B.* 23 * * 5 /usr/local/bin/cleanup.sh
• C.0 23 5 * * /usr/local/bin/cleanup.sh
• D.0 23 * * 5 /usr/local/bin/cleanup.sh

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Which command displays the amount of free and used physical memory and swap space in a human-readable format?

• A.free -h
• B.df -h
• C.vmstat 1
• D.uname -a

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A company's IT associate has been asked to switch to single-user mode on a running Linux server in order to perform some troubleshooting. Of the options below, which is the best way of doing this?

• A.linit 1
• B.Isu 1
• C.su single
• D.init singleuser

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