Ann, a junior systems administrator, is required to add a line to the /etc/yum.conf file. However, she receives the following error message when she tries to add the line:

Ann performs some diagnostics to attempt to find the root cause:

Which of the following commands should Ann execute to write content to /etc/yum?

• A.setenforce 0
• B.chmod 755 /etc/yum.conf
• C.chattr -I /etc/yum.conf
• D.setfacl -m m:rw /etc/yum.conf

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A Systems administrator needs to examine the output of all kernel-related events since the system was booted. Which of the following would BEST display this information?

• A.dmesg
• B.modinfo
• C.systemctl
• D.logger

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A technical support engineer receives a ticket from a user who is trying to create a 1KB file in the /tmp directory and is getting the following error: No space left on device. The support engineer checks the / tmpdirectory, and it has 20GB of free space.
Which of the following BEST describes a possible cause for this error?

• A.The /tmpdirectory is not mounted.
• B.The filesystem is formatted with a 4MB block size.
• C.the filesystem ran out of inodes.
• D.The /tmpdirectory has been set with an immutable attribute.

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A Linux administrator needs to configure a new firewall without an existing ACL to allow incoming web traffic.
The firewall must log the allowed network traffic. Which of the following command sequences would
accomplish this task when they are executed in order?

• A.iptables -A INPUT -m multiport -p tcp --dports 80,443 -J LOG
  iptables -A INPUT -m multiport -p tcp --dports 80,443 -J ACCEPT
• B.iptables -A INPUT -p tcp --dport 80 -J LOG
  iptables -A INPUT -p tcp --dport 443 -J LOG
  iptables -I INPUT -p tcp --dport 80 -J ACCEPT
  iptables -I INPUT -p tcp --dport 443 -J ACCEPT
• C.iptables -I INPUT -m multiport -p tcp --dports 80,443 -J LOG
  iptables -I INPUT -m multiport -p tcp --dports 80,443 -J ACCEPT
• D.iptables -A INPUT -p tcp --dport 80 -J ACCEPT
  iptables -A INPUT -p tcp --dport 443 -J ACCEPT
  iptables -A INPUT -p tcp --dport 80 -J LOG
  iptables -A INPUT -p tcp --dport 443 -J LOG

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An issue was discovered on a testing branch of a Git repository. A file was inadvertently modified and needs to be reverted to the master branch version. Which of the following is the BEST option to resolve the issue?

• A.git branch -b master file
• B.git merge master testing
• C.git stash branch master
• D.git checkout master -- file

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