Suppose you can access the caches in the local DNS servers of your department. Can you propose a way to roughly determine the Web servers (outside your department) that are most popular among the users in your department? Explain.

We can periodically take a snapshot of the Domain Name System (DNS) caches in the local  Domain Name System (DNS) servers.

Explanation:

We can periodically take a snapshot of the Domain Name System (DNS) caches in the local  Domain Name System (DNS) servers. The Web server that appears most frequently in the  Domain Name System (DNS) caches is the most popular server. This is because if more users are interested in a Web server, then Domain Name System (DNS) requests for that server are more frequently sent by users. Thus, that Web server will appear in the  Domain Name System (DNS) caches more frequently.  

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