Most computers consist of many computers and are usually connected by a networking devices such as a hub switch or access point?

This sentence is not a well-formed question. However, I believe the subject matter being referenced is a "Computer Network"

An Intranet is a group of computers that are connected together either by physical cable or wireless signals.

When multiple computer networks, or intranets, are connected together they form an internet.

Since a computer is a singular machine consisting of both mechanical and circuit-encoded parts, it does not consist of "many computers".

Some corrections of the initial sentence structure may be required in order to obtain the proper answer for the actual question intended.