computer network term

Bridges:

bridge is a device that make a connection or establish a connection between two LAN's (local area networking). it passes the packet or forwarded a packet from one lan to another without analyzing the packets. Bridge is independent protocol means there are no protocol as uses in router.

as shown above diagram, there are two LAN's which are connected through a bridge.
we can also see there are 4 computers or devices that are connected through a hub on the other hand the same are connected through a hub and between two hub there is a bridge.

in general terms bridge means a pathway or a path that connects two ends. in computer networking the functionality of bridge is same.

termonology

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GATEWAY
Gateway is used to translate one protocol into another protocol. gateway is a component that used in telecommunication. gateway works on multiple point.
In OSI gateway is used at different different level , and depend upon the type of protocol.

in above diagram, we have a 4 office computers and one printer that are connected through a switch and make a LAN . switch is connected with a gateway that help to translate the office computer data and send via. a modem to internet. office data protocol is different and through internal the users uses different different protocol so making a connection between office computer and users computers we used gateways.

as many times we saw "default gateway". what is default gateway???

default gateway is a device that passes the traffic from local subnet to the other subnet. it help to connect local network to internet.

as we saw in the diagram,the office computers are local network and through gateway these connect to the internet.