Describe the role of dns root servers in network, Computer Network Security

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QUESTION

(a) Describe the role of DNS root servers in the Internet network.

(b) What do you understand by the handover concept in a mobile network?

(d) An end user has reported that he is not getting connection to the main server. Assuming that the computer of the user and the server are connected to a switch, write down a procedure for troubleshooting the above problem using

(i) A command in the operating system.

(ii) Physical inspection.

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