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CompTIA Linux+ Certification Exam Sample Questions (Q736-Q741):

NEW QUESTION # 736
A Linux administrator is trying to start the database service on a Linux server but is not able to run it. The administrator executes a few commands and receives the following output:

Which of the following should the administrator run to resolve this issue? (Choose two.)

A. systemctl unmask mariadb
B. dnf reinstall mariadb
C. service mariadb reload
D. journalctl -g mariadb
E. chkconfig mariadb on
F. systemctl start mariadb

Answer: A,F

Explanation:
These commands will unmask the mariadb service, which is currently prevented from starting, and then start it normally.

NEW QUESTION # 737
An administrator transferred a key for SSH authentication to a home directory on a remote server. The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without a password.
However, the SSH command still asked for the password. Given the following output:

Which of the following commands would resolve the issue?

A. restorecon .ssh/authorized_keys
B. chown root:root .ssh/authorized_keys
C. chmod 600 .ssh/authorized_keys
D. ssh_keygen -t rsa -o .ssh/authorized_keys

Answer: C

Explanation:
Explanation
The command that would resolve the issue is chmod 600 .ssh/authorized_keys. This command will change the permissions of the .ssh/authorized_keys file to 600, which means that only the owner of the file can read and write it. This is necessary for SSH key authentication to work properly, as SSH will refuse to use a key file that is accessible by other users or groups for security reasons. The output of ls -l shows that currentlythe
.ssh/authorized_keys file has permissions of 664, which means that both the owner and group can read and write it, and others can read it.
The other options are not correct commands for resolving the issue. The restorecon .ssh/authorized_keys command will restore the default SELinux security context for the .ssh/authorized_keys file, but this will not change its permissions or ownership. The ssh_keygen -t rsa -o .ssh/authorized_keys command is invalid because ssh_keygen is not a valid command (the correct command is ssh-keygen), and the -o option is used to specify a new output format for the key file, not the output file name. The chown root:root
.ssh/authorized_keys command will change the owner and group of the .ssh/authorized_keys file to root, but this will not change its permissions or make it accessible by the user who wants to log in with SSH key authentication. References: How to Use Public Key Authentication with SSH; chmod(1) - Linux manual page

NEW QUESTION # 738
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
admin@192.168.10.50: Permission denied (publickey,password)
After seeing the message, the administrator attempts to connect using ssh -v admin@192.168.10.50 and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm
Which of the following actions should the administrator take first to remediate this issue?

A. Issue systemctl restart sshd on the local server.
B. Update permissions on the /home/admin/.ssh directory to 700 on the remote server.
C. Set PermitRootLogin yes in the /etc/ssh/sshd_config file.
D. Create a new key pair by running ssh-keygen -t ecdsa.

Answer: D

Explanation:
The "no mutual signature algorithm" error means the RSA/SHA-1 key type (ssh-rsa) isn't supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.

NEW QUESTION # 739
A Linux administrator needs to expose port 9000 for a container to listen during runtime. The Linux administrator creates a Dockerfile with the following entries:
sql
FROM node:9-alpine
WORKDIR /usr/src/app
COPY package.json ./
RUN npm install
COPY . .
EXPOSE 9000
CMD ["npm", "start"]
Which of the following commands should the administrator use to accomplish this task? (Choose two.)

A. docker run -p 80:9000 Test-Container
B. docker run -p 5000:80 Test-Container
C. docker push Test-Container
D. docker build -t Test-Container
E. docker tag Test-Container
F. docker inspect Test-Container

Answer: A,D

Explanation:
First, the administrator should build the container image using the command docker build -t Test- Container, which creates a Docker image with the specified configuration. To run the container and expose port 9000, the correct command is docker run -p 80:9000 Test-Container, which maps the container's port 9000 to port 80 on the host machine, making the service accessible externally on port 80.

NEW QUESTION # 740
During a system boot cycle, what program is executed after the BIOS completes its tasks?

A. The bootloader
B. The init program
C. The kernel
D. The inetd program

Answer: A

NEW QUESTION # 741
......

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