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Valid Dumps CompTIA XK0-005 Book - XK0-005 Test Papers

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CompTIA Linux+ Certification Exam Sample Questions (Q385-Q390):

NEW QUESTION # 385
A systems administrator needs to reconfigure a Linux server to allow persistent IPv4 packet forwarding.
Which of the following commands is the correct way to accomplish this task?

A. sysctl -w net.ipv4.ip_forward=1
B. echo 1 > /proc/sys/net/ipv4/ipv_forward
C. firewall-cmd --enable ipv4_forwarding
D. systemctl start ipv4_forwarding

Answer: A

Explanation:
The command sysctl -w net.ipv4.ip_forward=1 enables IPv4 packet forwarding temporarily by setting the kernel parameter net.ipv4.ip_forward to 1. To make this change persistent, the administrator needs to edit the file /etc/sysctl.conf and add the line net.ipv4.ip_forward = 1. The other options are incorrect because they either use the wrong file (/proc/sys/net/ipv4/ipv_forward), the wrong command (firewall-cmd or systemct1), or the wrong option (--enable or start).

NEW QUESTION # 386
A hardened physical Linux system allows regular, unprivileged users to remotely connect to the server using SSH only. No sudo tool has been installed. Which of the following should the Linux administrator use to perform administrative tasks on this host? (Select two).

A. Add the user to the wheel group
B. Create an SSH key and copy it to the remote server to allow passwordless login
C. Access the server's physical console and use the root user's password to log in
D. Install the sudo command using the unprivileged user's account
E. Install the telnet server on this system to be able to use a root account
F. Use the su command and enter the root user's password

Answer: C,F

Explanation:
As the sudo tool is not installed on the system, administrative tasks must be performed either via direct physical console access or by switching to the root user using the su command. Both methods require knowledge of the root password. Installing Telnet is not a good option due to its lack of security, and installing sudo using an unprivileged user is not possible without root privileges.

NEW QUESTION # 387
A Linux engineer has been notified about the possible deletion of logs from the file /opt/app/logs. The engineer needs to ensure the log file can only be written into without removing previous entries.

Which of the following commands would be BEST to use to accomplish this task?

A. chattr +d /opt/app/logs
B. chattr +c /opt/app/logs
C. chattr +i /opt/app/logs
D. chattr +a /opt/app/logs

Answer: D

Explanation:
Explanation
The command chattr +a /opt/app/logs will ensure the log file can only be written into without removing previous entries. The chattr command is a tool for changing file attributes on Linux file systems. The +a option sets the append-only attribute, which means that the file can only be opened in append mode for writing. This prevents the file from being modified, deleted, or renamed. This is the best command to use to accomplish the task. The other options are incorrect because they either set the wrong attributes (+d, +i, or +c) or do not affect the file at all (-a). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 11: Managing Files and Directories, page 357.

NEW QUESTION # 388
A Linux administrator needs to create a new user named user02. However, user02 must be in a different home directory, which is under /comptia/projects.
Which of the following commands will accomplish this task?

A. useradd -b /comptia/projects user02
B. useradd -s /comptia/projects user02
C. useradd -m /comptia/projects user02
D. useradd -d /comptia/projects user02

Answer: D

Explanation:
The command useradd -d /comptia/projects user02 will accomplish the task of creating a new user named user02 with a different home directory. The useradd command is a tool for creating new user accounts on Linux systems. The -d option specifies the home directory for the new user, which is the directory where the user's personal files and settings are stored. The
/comptia/projects is the path of the home directory for the new user, which is different from the default location of /home/user02.
The user02 is the name of the new user. The command useradd -d /comptia/projects user02 will create a new user named user02 with a home directory under /comptia/projects. This is the correct command to use to accomplish the task. The other options are incorrect because they either do not specify the home directory for the new user (useradd -m /comptia/projects user02 or useradd -s /comptia/projects user02) or do not use the correct option for the home directory (useradd -b /comptia/projects user02 instead of useradd -d /comptia/projects user02).

NEW QUESTION # 389
A user has connected a Bluetooth mouse to a computer, but it is not working properly. Which of the following commands should the systems administrator use to fix the issue?

A. modprobe -r bluetooth
B. insmod bluetooth
C. depmod -i bluetooth
D. lsmod -i bluetooth

Answer: A

NEW QUESTION # 390
......

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