Which one of the following computer network is built on the top of another netwo

Which one of the following computer network is built on the top of another network?

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1) WAN stands for

2) In the layer hierarchy as the data packet moves from the upper to the lower layers, headers are

3) In computer which range is in registered ports:

4) ISP exchanges internet traffic between their networks by

5) Which of the following is not a method of accessing the web?