When upgraded computers are not able to obtain an IP address, the issue often lies in the network configuration. Here's a
* Option A: The switch is only providing IPv6 addresses.This is unlikely because if the switch were providing IPv6 addresses, the devices would still receive an IP address, albeit an IPv6 one. The issue described indicates no IP address is being obtained at all.
* Option B: The OS must be updated to be compatible with the imaging software.This option is unrelated to obtaining an IP address. Compatibility with imaging software would not prevent the devices from getting an IP address.
* Option C: The switch has port security enabled.Correct Answer. Port security on a switch restricts access based on MAC addresses. If the MAC addresses of the upgraded computers are not recognized or have not been added to the allowed list, the switch will not provide network access, resulting in the computers not obtaining an IP address.
Reference: CompTIA A+ Core 1 (220-1101) Exam Objectives, Section 2.6
Option D: The switch does not support multicast traffic.This is unrelated to obtaining an IP address. Multicast traffic deals with specific types of network communication and would not affect the basic DHCP IP address assignment process.

Redeeming the included activation key card for a product key is the correct way to apply a Windows 10 Pro license to a computer that has Windows 10 Home installed. The activation key card is a physical or digital card that contains a 25-digit code that can be used to activate Windows 10 Pro online or by phone. Copying the windows.lie file, inserting a Windows USB hardware dongle and activating with the digital license are not valid methods of applying a Windows 10 Pro license. Verified References: https://www.comptia.org/blog
/how-to-upgrade-windows-10-home-to-pro https://www.comptia.org/certifications/a

The CompTIA A+ Core 2 220-1002 exam covers this topic in the following domains: 1.2 Given a scenario, use appropriate resources to support users and 1.3 Explain the importance of security awareness.

Configuring the Account Lockout Policy in Windows 10 is the appropriate action to limit password attempts.
This security setting determines the number of failed login attempts that will trigger a lockout, preventing unauthorized access due to repeated password guessing. It is an effective measure to enhance security by deterring brute-force attacks.

Educating the end user is the best way to prevent future infections by viruses or other malware. The technician should teach the user how to avoid risky behaviors, such as opening suspicious attachments, clicking on unknown links, downloading untrusted software, etc. Disabling System Restore, installing the latest OS patches and performing a clean installation are possible ways to remove existing infections, but they do not prevent future ones. Verified References: https://www.comptia.org/blog/how-to-prevent-malware
https://www.comptia.org/certifications/a