Final answer:
A firewall is the component of a network designed to prevent unauthorized Internet intrusions.
Step-by-step explanation:
The component of a network that is designed to prevent unauthorized Internet intrusions is the Firewall. A firewall is a security device that monitors and controls incoming and outgoing network traffic, acting as a barrier between the internal network and the external network. It examines each data packet and applies predetermined rules to determine whether to allow or block the packet.