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CompTIA Linux+ Exam Questions and Answers

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Viewing page 14 out of 15 pages

Viewing questions 131-140 out of questions

Questions # 131:

The MySQL database process that was running on a Linux server suddenly stopped, and the process was killed. Which of the following commands can help identify whether this issue was produced by the OOM killer?

Options:

grep /proc/oom_score

grep -ir "out of memory" /var/log

cat /var/run/initramfs/overlayroot.log | grep "out of memory"

cat /sys/block/loop0/events

Answer

Explanation

The grep -ir "out of memory" /var/log command searches through log files in /var/log for any instances of "out of memory" errors, which indicate that the oom-killer terminated processes due to insufficient memory. This is the quickest way to determine if the oom-killer caused the MySQL process to be killed.

Questions # 132:

Which of the following is a benefit of a service mesh?

Options:

Encrypted communication between two services in a Kubernetes environment

Direct access to the Kubernetes API services through the use of tokens

Elevated privileges in a Kubernetes pod to allow root access in a hardened cluster

Creating PVCs in a Kubernetes cluster to store and manage persistent data

Answer

Explanation

A service mesh provides secure, encrypted communication between microservices in a Kubernetes environment. It also provides features like traffic management, observability, and load balancing at the network layer. The most popular service mesh implementations, such as Istio, handle security by enforcing mutual TLS (mTLS) encryption between services, ensuring data privacy and integrity.

Questions # 133:

Joe, a user, is unable to log in to the system. The Linux administrator checks the /etc/passwd file and reviews the following output:

Joe:x:1002:1002::/home/Joe:/sbin/nologin

Which of the following should the administrator do to fix this issue?

Options:

Remove the x entry in the /etc/passwd file for Joe

Change the /sbin/nologin entry to /bin/sh for Joe

Issue the usermod -l Joe command

Ensure that a corresponding entry is in the /etc/shadow file for Joe

Answer

Explanation

The /sbin/nologin shell is used to prevent a user from logging in. To allow Joe to log in, the administrator should change his shell to /bin/sh, which is a standard login shell in Linux. This change will allow Joe to access the system normally.

Questions # 134:

A Linux administrator is updating the file that contains the addresses of the software and update repositories on an Ubuntu system. Which of the following files needs to be edited to accomplish this task?

Options:

/etc/apt/sources.list

/etc/apt/listchanges.conf

/etc/yum/yum.conf

/etc/dnf/dnf.conf

Answer

Explanation

Ubuntu uses APT as its package manager.

Repository addresses are defined in /etc/apt/sources.list.

Incorrect Options:

B: Controls display of changelogs during upgrades.

C and D: Belong to Red Hat-based systems (YUM/DNF).

[Reference:, CompTIA Linux+ XK0-005 Study Guide, Chapter 7, man sources.list, ]

Questions # 135:

A Linux engineer wants to give read-write-execute permissions for the cloud_users directory to user Oliver. Which of the following commands should the engineer use?

Options:

setfacl -L Oliver/cloud_users

setfacl -x rwx/cloud_users

setfacl -P rwx/cloud_users

setfacl -m u:Oliver/cloud_users

Answer

Explanation

The setfacl -m u:Oliver:rwx /cloud_users command modifies the ACL (Access Control List) for the directory cloud_users, granting the user Oliver read, write, and execute permissions. This is the correct syntax for assigning specific permissions to a user.

Questions # 136:

An administrator accidentally installed the httpd RPM package along with several dependencies. Which of the following options is the best way for the administrator to revert the package installation?

Options:

dnf clean all

rpm -e httpd

apt-get clean

yum history undo last

Answer

Explanation

The yum history undo last command allows the administrator to undo the most recent transaction, effectively removing the httpd package and any installed dependencies. This is the safest and easiest way to revert package installations in RPM-based systems using yum.

Questions # 137:

A Linux administrator would like to measure possible packet loss between a workstation and a remote web application that is running on port 443. Which of the following would be the best command for the administrator to use to display this information?

Options:

ping -c 50

tcpdump -p 443

mtr -T -P 443

traceroute -p 443

Answer

Explanation

mtr (My Traceroute) is a network diagnostic tool that combines the functionality of traceroute and ping. It shows real-time packet loss and latency on a hop-by-hop basis. The -T option uses TCP instead of ICMP, and the -P 443 option specifies the remote port. This provides the best method for checking packet loss on port 443.

Questions # 138:

A Linux administrator is troubleshooting a systemd mount unit file that is not working correctly. The file contains:

[root@system] # cat mydocs.mount

[Unit]

Description=Mount point for My Documents drive

[Mount]

What=/dev/drv/disk/by-uuid/94afc9b2-ac34-ccff-88ae-297ab3c7ff34

Where=/home/user1/My Documents

Options=defaults

Type=xfs

[Install]

WantedBy=multi-user.target

The administrator verifies the drive UUID correct, and user1 confirms the drive should be mounted as My Documents in the home directory. Which of the following can the administrator

do to fix the issues with mounting the drive? (Select two).

Options:

Rename the mount file to home-user1-My\x20Documents.mount.

Rename the mount file to home-user1-my-documents.mount.

Change the What entry to /dev/drv/disk/by-uuid/94afc9b2\-ac34\-ccff\-88ae\-297ab3c7ff34.

Change the Where entry to Where=/home/user1/my\ documents.

Change the Where entry to Where=/home/user1/My\x20Documents.

Add quotes to the What and Where entries, such as What="/dev/drv/disk/by-uuid/94afc9b2-ac34-ccff-88ae-297ab3c7ff34" and Where="/home/user1/My Documents".

Answer

A, E

Explanation

The mount unit file name and the Where entry must be escaped to handle spaces in the path.ReferencesThe mount unit file name must be named after the mount point directory, with spaces replaced by \x20. See How to escape spaces in systemd unit files? and systemd.mount.The Where entry must use \x20 to escape spaces in the path. See systemd.mount and The workaround is to use /usr/bin/env followed by the path in quotes..

Questions # 139:

A Linux administrator needs to list the packages that are currently installed on a server. Which of the following commands should the administrator use?

Options:

snap install list

snap list

snap show

snap packages

Answer

Explanation

The snap list command lists all installed Snap packages on the system. Snap is a package management system that is used for installing and managing software packages in Linux. It shows information about the installed Snap packages, including the version, publisher, and whether the package is active.

Questions # 140:

A Linux systems administrator is working to obtain the installed kernel version of several hundred systems. Which of the following utilities should the administrator use for this task?

Options:

Ansible

Git

Docker

Bash

Answer

Explanation

Ansible is an open-source automation tool that can manage multiple systems simultaneously. Using an Ansible playbook, the administrator can run commands across several servers to obtain the installed kernel version efficiently. A simple ansible all -m command -a "uname -r" will retrieve the kernel version from all target systems.

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Viewing questions 131-140 out of questions