What is a Gateway in a Network?
Answer
Clear, interview-ready explanation
A gateway is a device or system that connects two different networks and allows them to communicate with each other. Gateways are also known as protocol converters, because they play an important role in converting protocols supported by traffic on different networks. It seamlessly routes and transforms data traffic so that incompatible networks can exchange information.
For example, in a local network, a default gateway is usually a router that forwards traffic from your computer to other networks, such as the internet.
Example:
Suppose your computer's IP address is 192.168.1.10 and your default gateway is 192.168.1.1. When you access a website outside your local network, your computer sends the traffic to the gateway.
Common types of gateways:
- Default Gateway — connects a local network to other networks.
- API Gateway — manages requests going to backend services.
- Payment Gateway — processes online payment transactions.
- Email Gateway — manages or filters email traffic.