Why is it hard to determine how big the Internet is today? Give several reasons.

The Internet connects millions of computers all over the world. Every year, millions of new users join the Internet and new connections are added all the time. The Internet does not have one main control center that has access to all user activity and all happenings. There are no boundaries to the Internet. There are many different ways of connecting to the Internet, each way with its own class of service and degree of interactivity.

Why are TCP/IP protocols so important to the functioning of the Internet? What do they do?

TCP/IP protocols are protocols that allow the transfer of information between different networks and computers. The TCP protocol works as a sort of postal system, transferring information in packets across connections and networks, until they reach their destination. The IP protocol is the address system of the Internet. Each computer has its own unique IP address. Computers are recognized by these. This is how the information that the TCP protocol transfers knows where to go.