SkillTestPro | CompTIA Linux+ Practice Test

CompTIA Linux+ Practice Test 1

CompTIA Linux+ Practice Test

1 / 10

What does the iptables -A INPUT -p tcp --dport 22 -j ACCEPT command do?

Blocks all SSH traffic

Forwards SSH packets to another port

Allows incoming SSH traffic

Logs all SSH connections

Rejects TCP traffic on port 22

2 / 10

Which command creates a new user account named "jdoe" with a home directory?

adduser jdoe

useradd jdoe

usermod -d /home/jdoe

passwd jdoe

mkdir /home/jdoe

3 / 10

What is the purpose of the /etc/fstab file?

Stores user passwords

Configures network interfaces

Logs system boot messages

Sets kernel parameters

Defines filesystem mount points

4 / 10

Which command displays real-time CPU and memory usage for running processes?

ps aux

free -m

vmstat

top

lscpu

5 / 10

What does the grep -r "error" /var/log command do?

Lists all files in /var/log

Searches for the word "error" recursively in /var/log

Removes lines containing "error" from logs

Copies files with "error" to /var/log

Counts the number of files in /var/log

6 / 10

Which utility is used to manage software packages on a Red Hat-based system?

apt

dpkg

zypper

yum

pacman

7 / 10

What command schedules a one-time task to run at 2:00 AM tomorrow?

cron -e

schedule 2:00 AM

crontab -l

systemctl timer

at 2:00 tomorrow

8 / 10

Which file is used to configure persistent network interface settings on a Debian-based system?

/etc/hosts

/etc/network/interfaces

/etc/resolv.conf

/etc/sysctl.conf

/etc/netplan/01-netcfg.yaml

9 / 10

What is the purpose of the chmod 755 command on a file?

Sets the file to read-only for all users

Grants execute permission to the owner only

Allows the owner to read, write, and execute, and others to read and execute

Removes all permissions from the group

Makes the file a symbolic link

10 / 10

Which command displays the current running kernel version on a Linux system?

cat /etc/os-release

lsb_release -a

hostnamectl

uname -r

sysctl -a

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The average score is 40%