Final answer:
The utility that a technician would use on a Windows Vista or Windows 7 machine to configure what applications are allowed to send/receive data over the LAN connection is Windows Firewall.
Step-by-step explanation:
The utility that a technician would use on a Windows Vista or Windows 7 machine to configure what applications are allowed to send/receive data over the LAN connection is Windows Firewall. Windows Firewall is a built-in security feature in Windows operating systems that allows users to control which programs are allowed to communicate over the network.
By configuring the Windows Firewall settings, a technician can specify whether an application is allowed to send/receive data over the LAN connection. They can create rules to allow or block specific applications or ports, helping to protect the computer from unauthorized access or malicious network activity.
For example, if a technician wants to allow an application like a web browser to access the internet but block other applications from doing so, they can create a rule in the Windows Firewall to only allow outgoing network traffic from the web browser.