An administrator is troubleshooting connectivity to a remote server. The goal is to remotely connect to the server to make configuration changes. To further troubleshoot, a port scan revealed the ports on the
server as follows:
Port 22: Closed
Port 23: Open
Port 990: Closed
Which of the following next steps should the administrator take?
Reboot the workstation and then the server.

1. A. Open port 990 and close port 23.
2. B. Open port 22 and close port 23.
3. C. Open all of the ports listed.
4. D. Close all of the ports listed.

Correct Answer: B
Port 22 is used for SSH (Secure Shell), which is a secure and encrypted protocol for remote access to a server. Port 23 is used for Telnet, which is an insecure and unencrypted protocol for remote access. Port 990 is used for FTPS (File Transfer Protocol Secure), which is a secure and encrypted protocol for file transfer. The administrator should open port 22 and close port 23 to enable SSH and disable Telnet, as SSH is more secure and reliable than Telnet. The administrator does not need to open port 990, as FTPS is not required for making configuration changes123.
References = 1: Remote Desktop - Allow access to your PC from outside your network(https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-allow-outside-access) 2: Test remote network port connection in Windows 10 - Winaero(https://winaero.com/test-remote-network-port- connection-in-windows-10/) 3: Windows Command to check if a remote server port is opened?(https://superuser.com/questions/1035018/windows-command-to-check-if-a-remote-server-port-is-opened)

Which of the following refers to the requirements that dictate when to delete data backups?

1. A. Retention policies.
2. B. Cloud security impact
3. C. Off-site storage
4. D. Life-cycle management

Correct Answer: A
Retention policies are the guidelines that dictate when to delete data backups based on operational or compliance needs. They specify how long, how, where, and in what format the data backups are stored, and who has authority over them. The other options are not directly related to the deletion of data backups.
https://backup.ninja/news/Database-Backups-101-Backup-Retention-Policy-Considerations

A technician needs maximum power redundancy while configuring a new server rack. Which of the following should be specified? (Select two).

1. A. Separate circuits
2. B. Rack balancing
3. C. Blanking panels
4. D. High-voltage PDUs
5. E. KVM placement
6. F. Multiple UPSs

Correct Answer: AF
Separate circuits and multiple UPSs can provide fail-safe power redundancy for a server rack. Separate circuits mean that the server rack is connected to two or more independent power sources, such as different utility lines or generators. This can prevent a single point of failure in the power supply, as if one circuit goes down, the other circuit can still provide power to the server rack1. Multiple UPSs mean that the server rack has two or more uninterruptible power supplies, which are devices that provide backup power and surge protection in case of a power outage or fluctuation. Multiple UPSs can be connected to separate circuits, or to different outlets on the same circuit, to increase the reliability and availability of power for the server rack23.

An administrator reviews a new server that was received from a vendor and notes the OS has been installed to a two-drive array configured with RAID 0. Which of the following best describes what will happen if a drive in that array fails?

1. A. The server will gracefully shut down.
2. B. The server will immediately crash.
3. C. The server will operate but in read-only mode.
4. D. The server will continue to operate normally.

Correct Answer: B
RAID 0 is a configuration that splits data evenly across two or more disks without parity or mirroring. This improves performance but offers no fault tolerance. If a drive in a RAID 0 array fails, the data on the array becomes inaccessible and the server will immediately crash. The other options are not applicable to RAID 0. References: [CompTIA Server+ Certification Exam Objectives], Domain 3.0: Storage, Objective 3.2: Given a scenario, configure RAID using best practices.

A server technician is installing application updates on a Linux server. When the technician tries to install a MySQL update, the GUI displays the following error message: AVC denial. Which of the following should the technician do for the MySQL update to install?

1. A. Download the update manually and run a checksum utility to verify file integrity.
2. B. Issue the setenforce 0 command.
3. C. Create a firewall rule to allow port 3306 through the firewall.
4. D. Issue the yum -y update mysql command.

Correct Answer: B
The AVC denial error message indicates that SELinux (Security-Enhanced Linux) is preventing the MySQL update from installing. SELinux is a security module that enforces mandatory access control policies on Linux systems. To install the MySQL update, the technician should issue the setenforce 0 command, which temporarily disables SELinux enforcement until the next reboot. Downloading the update manually, creating a firewall rule, or issuing the yum -y update mysql command will not resolve the error. References: [CompTIA Server+ Certification Exam Objectives], Domain 4.0: Server Administration, Objective 4.3: Given a scenario, troubleshoot server issues using appropriate tools.