What is Personal Area Network | What is wide area network| What is VPN| What is TCP/IP| HUB| Switch

In this video I am going to show you what is network types? in this types there are the following types
1. Personal area network.
2. local area network.
3. wide area network.
4. metropolitan area network.
5. virtual private network.
What is HUB?
What is Switch?
What is TCP/IP?