A computer network usually spreading over a metropolitan area such as a city and the suburbs

A company own network is known as 

The protocol that is used to send the e-mail over Internet

The path or the circuit across which data is transferred between nodes, devices, servers etc. is known as 

The switching technique in which path is established in advance known as

The application that allows two or more users to communicate with each other in the real time 3D environment

The protocol that is used to receive the e-mail over Internet

The foundation of computer networks was laid in 1969 by

A computer network that spreads over a large geographical area like a country or a continent

The topology that combines the characteristics of the linear bus and the star topology known as