A VPN (Virtual Private Network) is a service that allows remote employees to access the company's network resources securely over the internet as if they were on premises. A VPN encrypts the data traffic between the employee's device and the VPN server, and assigns the employee a virtual IP address that belongs to the company's network. This way, the employee can access the local servers, files, printers, and other resources without exposing them to the public internet. A VPN also protects the employee's privacy and identity by masking their real IP address and location.

The most likely cause of the issue is a "time drift". Time drift occurs when the clock on a computer is not synchronized with the clock on the domain controller. This can cause authentication problems when a user tries to log in to the domain. The fact that the technician is unable to browse to the secure intranet site to get troubleshooting tools suggests that there may be a problem with the network connection or the firewall settings on the desktop PC12

Local Users and Groups is the best option to accomplish this task. Local Users and Groups is a tool that allows managing the local user accounts and groups on a Windows workstation. The technician can use this tool to create a new user account with administrator privileges or add an existing user account to the Administrators group. This way, the technician can log in with the administrator account and make system changes without elevating permissions. Group Policy Editor, Device Manager, and System Configuration are not correct answers for this question. Group Policy Editor is a tool that allows configuring policies and settings for users and computers in a domain environment. Device Manager is a tool that allows managing the hardware devices and drivers on a Windows workstation. System Configuration is a tool that allows modifying the startup options and services on a Windows workstation. None of these tools can directly grant administrator access to a user account. References:
* Official CompTIA learning resources CompTIA A+ Core 1 and Core 2, page 13
* CompTIA A+ Complete Study Guide: Core 1 Exam 220-1101 and Core 2 Exam ..., page 103

The performance degradation following the launch of a new external web server suggests that Quality of Service (QoS) considerations were overlooked. QoS settings help prioritize traffic to ensure that critical services like web servers receive the bandwidth they need without negatively impacting the overall network performance. Without proper QoS configuration, the new server's traffic could overwhelm the firewall, leading to widespread performance issues.

When a technician finds that a user's office is not listed for an upgrade but the user has submitted a request, the appropriate action is to:
* Notify the project manager about the user's concern: The project manager oversees the upgrade process and can address any discrepancies or omissions in the upgrade list.
* Ask the company's human resources department to address the issue: HR typically handles personnel matters, not hardware upgrades.
* Tell the user that this request is not on the list to be upgraded: This does not resolve the user's concern and could cause frustration.
* Ask the user's supervisor if the technician should upgrade the computer: The supervisor may not have the authority or information to make decisions about the upgrade list.
Reference:
CompTIA A+ 220-1102 Exam Objectives, Section 4.1: Given a scenario implement best practices associated with documentation and support systems information management.
Best practices for handling user requests and project management documentation.