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CompTIA Linux+ Exam Questions and Answers

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Viewing questions 141-150 out of questions

Questions # 141:

An administrator wants to execute a long-running script in the terminal while troubleshooting another issue. Which of the following options will achieve this goal?

Options:

bash script.sh &

source script.sh

sh script.sh | jobs

nice -10 ./script.sh

Answer

Explanation

Running a command with & at the end sends it to the background, allowing the administrator to continue using the terminal for other tasks while the script runs. This is useful for long-running scripts that do not require immediate attention but need to keep running.

[Reference: Linux Background Jobs, , ]

Questions # 142:

Users are experiencing high latency when accessing a web application served by a Linux machine. A systems administrator checks the network interface counters and sees the following:

Which of the following is the most probable cause of the observed latency?

Options:

The network interface is disconnected.

A connection problem exists on the network interface.

No IP address is assigned to the interface.

The gateway is unreachable.

Answer

Explanation

The high number of errors and dropped packets in the output of the network interface counters indicate a connection problem on the network interface.

[References:, CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Networking, Section: Troubleshooting Network Issues, Page 359., Linux+ (Plus) Certification, Exam Objectives: 4.3 Given a scenario, troubleshoot and resolve basic network configuration and connectivity issues., , , , , ]

Questions # 143:

A systems administrator created a user cron to run a scheduled database backup cronjob on the server at 1 a.m. every day. The following is the cronjob syntax:

0 1 * * * /bin/sh backup.sh

The backups, however, are not being created. When checking the crontab file, the administrator sees the following error:

/var/spool/cron/crontab/cron: Permission denied

Which of the following will permit the cronjob to execute?

Options:

Creating the file cron.allow and adding user cron to it

Giving cron ownership of the file /usr/bin/crontab

Running sudo cron restart to activate the cronjob

Running sudo crontab -u cron -e to edit the file with sudo

Answer

Explanation

The error indicates that the cron user does not have permission to run the cronjob. Creating a cron.allow file and adding the user cron to it will allow that user to run cronjobs. The cron.allow file is a security feature that controls which users are allowed to use cron.

Questions # 144:

A systems administrator wants to ensure all the latest patches and updates are automatically synced to the local repository every two hours on Sundays through Tuesdays in the month of May. Which of the following cron entries can the administrator use to achieve this goal? (Select two.)

Options:

0 */2 * 5 0-3 /root/update-from-remote-to-local.sh

0 0,2,4,6,8,10,12,14 * 5 0-2 /root/update-from-remote-to-local.sh

0 0,2,4,6,8,10,12,14 * 5 0-3 /root/update-from-remote-to-local.sh

0 0-23/2 * 5 0-3 /root/update-from-remote-to-local.sh

0 0-23/2 * 5 0-2 /root/update-from-remote-to-local.sh

0 */2 * 5 0-2 /root/update-from-remote-to-local.sh

Answer

A, C

Explanation

Both A and C correctly:

Execute the script every 2 hours (*/2 or defined 2-hour intervals),

During May (5 in the month field),

On Sunday through Tuesday (0-2 or 0-3 where Sunday = 0),

Targeting /root/update-from-remote-to-local.sh.

The others are either too broad (0-23/2 includes non-target days) or use incorrect ranges.

[Reference: CompTIA Linux+ XK0-005 Official Study Guide, Domain 4.0 – System Management, “Cron format: minute hour day-of-month month day-of-week command. Use ranges and intervals to target specific execution times.”, , ]

Questions # 145:

A systems administrator is configuring a Linux system so that network traffic from the internal network 172.17.0.0/16 going out through the eth0 interface would appear as if it was sent directly from this interface. Which of the following commands will accomplish this task?

Options:

iptables -A POSTROUTING -s 172.17.0.0/16 -o eth0 -j MASQUERADE

firewalld -A OUTPUT -s 172.17.0.0/16 -o eth0 -j DIRECT

nmcli snasq-traffic eth0 -s 172.17.0.0/16 -j MASQUERADE

ifconfig --nat eth0 -s 172.17.0.0/16 -j DIRECT

Answer

Explanation

The command iptables -A POSTROUTING -s 172.17.0.0/16 -o eth0 -j MASQUERADE configures Network Address Translation (NAT) using iptables. This ensures that traffic from the internal network (172.17.0.0/16) going out through the eth0 interface will appear to be originating from the eth0 IP address. This is commonly used for internet-sharing or NAT setups in Linux.

Questions # 146:

A systems administrator is tasked with changing the default shell of a system account in order to disable iterative logins. Which of the following is the

best option for the administrator to use as the new shell?

Options:

/sbin/nologin

/bin/ sh

/sbin/ setenforce

/bin/bash

Answer

Explanation

The /sbin/nologin shell is a special shell that prevents the user from logging into an interactive session. It is commonly used for system accounts that are not meant to be accessed by users, such as daemon or service accounts. When a user tries to log in with this shell, they will see a message like “This account is currently not available” and the login will fail.

[References:, The /sbin/nologin shell is listed as one of the valid shells in the /etc/shells file1., The CompTIA Linux+ Certification Exam Objectives mention that the candidate should be able to “configure and manage system accounts and groups, including password aging and restricted shells” as part of the Hardware and System Configuration domain2., The usermod command can be used to change the user’s login shell with the -s or --shell option3. For example, to change the shell of a user named daemon to /sbin/nologin, the command would be: sudo usermod -s /sbin/nologin daemon, , , , ]

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