Question

which is a communcation device that is used to connect two logically and physically different network ​

Answer 1

Answer:

A router is a network communication device that is used to connect two or more logically and physically different networks. A router can be used to connect a LAN to LAN, LAN to WAN and LAN to internet. A router acts as a post office where sorting and distribution of the posts (packets in case of routers) is done.

Answer 2

Answer:

Gateway is a network device used to connect two or more dissimilar networks. In networking parlance, networks that use different protocols are dissimilar networks. A gateway usually is a computer with multiple NICs connected to different networks. A gateway can also be configured completely using software.