The device used to connect different types of networks is called a gateway. A gateway is a network node that serves as an entry point to another network. It is capable of connecting networks that use different communication protocols, data formats, or architectures. Gateways are essential for enabling communication between disparate networks, such as connecting a local area network (LAN) to the internet or linking a traditional IP-based network to a specialized industrial network.

Key Functions of a Gateway:

1. Protocol Translation: Gateways can translate data between different protocols, allowing devices on one network to communicate with devices on another network that uses a different protocol.
2. Data Format Conversion: They can convert data formats to ensure compatibility between networks.
3. Security: Gateways often include firewalls or other security features to protect the networks they connect.
4. Routing: They can route data packets between networks, ensuring that information reaches its intended destination.

Examples of Gateways:

• Internet Gateway: Connects a local network to the internet.
• VoIP Gateway: Connects traditional telephone networks to Voice over IP (VoIP) networks.
• Cloud Gateway: Connects on-premises systems to cloud-based services.

Other Devices for Network Connectivity:

While gateways are specifically designed to connect different types of networks, other devices like routers, switches, and bridges are used for connecting similar types of networks or managing traffic within a network. However, these devices do not typically handle protocol or data format translation.

In summary, a gateway is the primary tool used to connect different types of networks, enabling seamless communication across diverse systems.