Final answer:
A firewall is the type of network that protects the internal LAN from a Web Server accessible by the Internet.
Step-by-step explanation:
The type of network that protects the internal LAN from a Web Server accessible by the Internet is a firewall.
A firewall acts as a barrier between the internal network and the Internet, analyzing incoming and outgoing network traffic based on a set of predefined rules. It helps to prevent unauthorized access and protects against malicious activities from the internet.
For example, if a Web Server on the internal LAN needs to be accessed by the Internet, the firewall can be configured to allow only specific types of incoming traffic to reach the server while blocking other types of traffic that can pose a security risk.