An evil twin is a type of social-engineering attack that involves setting up a rogue wireless access point that mimics a legitimate one. The attacker can then intercept or modify the traffic of the users who connect to the fake SSID. The attacker may also use phishing or malware to steal credentials or personal information from the users

Explanation
DNS (domain name system) is a protocol that translates domain names to IP addresses. If the computer has an incorrect DNS address assigned, it will not be able to resolve the domain names of web-based applications and access them. A firewall, a VLAN (virtual local area network) and a browser cache are not the most likely reasons for the issue, since the computer can ping known IP addresses on the internet and receive a response.
Verified References: https://www.comptia.org/blog/what-is-dns https://www.comptia.org/certifications/a

1. Startup Folder1: The Startup folder is a special folder that contains shortcuts to programs or scripts that will run automatically when a user logs on. The technician can create a shortcut to the script and place it in the Startup folder for the conference room computer or for all users.
2. Task Scheduler23: The Task Scheduler is a tool that allows you to create tasks that run at specified times or events. The technician can create a task that runs the script at logon for the conference room computer or for all users.

Screen-sharing software is a tool that allows a technician to remotely view and control a user's screen over the internet. It can be used to troubleshoot issues with accessing an online share, as well as other problems that require visual inspection or guidance. Secure shell (SSH) is a protocol that allows remote access and command execution on another device, but it does not allow screen-sharing. Virtual private network (VPN) is a protocol that creates a secure tunnel between two devices over the internet, but it does not allow remote troubleshooting. File transfer software is a tool that allows transferring files between two devices over the internet, but it does not allow screen-sharing. Verified References:
https://www.comptia.org/blog/what-is-screen-sharing-software https://www.comptia.org/certifications/a