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CompTIA Linux+ Certification Exam Sample Questions (Q146-Q151):

NEW QUESTION # 146
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. Access the server's physical console and use the root user's password to log in
B. Install the telnet server on this system to be able to use a root account
C. Use the su command and enter the root user's password
D. Add the user to the wheel group
E. Create an SSH key and copy it to the remote server to allow passwordless login
F. Install the sudo command using the unprivileged user's account

Answer: A,C

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 # 147
Which of the following information is stored within the BIOS? (Choose TWO correct answers.)

A. Hardware configuration
B. Linux kernel version
C. The system's hostname
D. Timezone
E. Boot device order

Answer: A,E

NEW QUESTION # 148
While inspecting a recently compromised Linux system, the administrator identified a number of processes that should not have been running:

Which of the following commands should the administrator use to terminate all of the identified processes?

A. kill -9 "upload*.sh"
B. skill -9 "upload*.sh"
C. pkill -9 -f "upload*.sh"
D. killall -9 "upload*.sh"

Answer: C

Explanation:
The pkill -9 -f "upload*.sh" command will terminate all of the identified processes. This command will send a SIGKILL signal (-9) to all processes whose full command line matches the pattern
"upload*.sh" (-f). This signal will force the processes to terminate immediately without giving them a chance to clean up or save their state.
The kill -9 "upload*.sh" command is invalid, as kill requires a process ID (PID), not a pattern.
The killall -9 "upload*.sh" command is incorrect, as killall requires an exact process name, not a pattern.
The skill -9 "upload*.sh" command is incorrect, as skill requires a username or a session ID (SID), not a pattern.

NEW QUESTION # 149
A senior administrator has placed a private key for user admin in your home directory.
The server you need to remotely access is server1 and SSH is listening on port 2222.
INSTRUCTIONS
Part 1
Review the command output and build the correct command to place the private key into your SSH folder.
Part 2
Review the command output and build the correct command to set the file permissions.
Part 3
Review the command output and build the correct command to set the correct ownership.
In each part, click on objects to build a complete command. Command objects may be used more than once, but not all will be used. Use _ as the spacebar. Click the arrow to remove any unwanted objects from your command.
Part 4
Select the proper file to edit for remote server access. Then, build the correct configuration output based on the server name, ports, and files.

Answer:

Explanation:
See the Explanation part for detailed answer of each part.
Explanation:
Part 1
Here is the step-by-step command construction process:
1. Move the private key (likely named server1 based on the provided details) to the .ssh directory:
mv ~/server1 ~/.ssh/id_rsa
This command moves the private key (assuming it's named server1) from the home directory (~) to the .ssh directory and renames it to id_rsa (which is the default SSH private key file name).
2. Set the correct permissions for the private key file:
chmod 600 ~/.ssh/id_rsa
The private key file should be readable and writable only by the owner to maintain security.
3. Connect to the server using the private key and the correct port (2222):
ssh -i ~/.ssh/id_rsa -p 2222 admin@server1
This command tells ssh to use the specified private key (-i ~/.ssh/id_rsa), connect on port 2222 (-p 2222), and log in as the admin user on server1.
Part 2: Setting File Permissions
The correct command to set the file permissions based on the screenshots would likely involve using chmod.
Here is the command to set permissions correctly:
chmod 600 ~/.ssh/id_rsa
This restricts the private key's permissions so that only the user can read and write it.
Part 3: Setting Ownership
If ownership needs to be set, the command would look like this:
chown comptia:comptia ~/.ssh/id_rsa
This command ensures that the file is owned by the correct user (comptia) and the correct group (comptia).
In part 4, it asks you to select the proper file for editing to enable remote server access. Based on standard SSH configuration requirements, the proper file to edit for remote server access would be ~/.ssh/config.
Here's why:
* ~/.ssh/config: This file allows you to set up configuration options for different hosts, including specifying ports, user names, and the identity file (private key). You would add the necessary configuration for server1 to this file for easier access.
* Other options:
* ~/.ssh/authorized_keys: This file lists public keys that are authorized to log in to the local system.
It's not meant for configuring remote access to another server.
* ~/.ssh/known_hosts: This file stores the host keys of servers you've connected to. It doesn't allow for editing remote access settings.
* ~/.ssh/server1: This seems like a private key file or another custom file, but it's not typically used to configure SSH options.
For configuring access to server1 on port 2222, you would add a block like this to the ~/.ssh/config file:
Host server1
HostName server1
Port 2222
User admin
IdentityFile ~/.ssh/id_rsa

NEW QUESTION # 150
A user is unable to write data to an NFS datastore at /mnt/storage. A df command indicates 50% free inodes.
Which of the following commands should the user attempt NEXT to diagnose the situation?

A. df -i /mnt/storage
B. df -h /mnt/storage
C. du -sh /mnt
D. fdisk -l /mnt/storage

Answer: B

Explanation:
fdisk shows physical characteristics of disks, du shows only particular dir/mount usage while df shows everything.

NEW QUESTION # 151
......

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CompTIA Linux+ Certification Exam Sample Questions (Q146-Q151):

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