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P20.Suppose you can access the caches in the local DNS servers of your department. Can you propose away to roughly determine the Web servers (outside your department) that are most popular among the users in your department? Explain.P21.Suppose that your department has a local DNS server for all computers in the department. You are an ordinary user (i.e., not a network/system administrator). Can you determine if an external Web site was likely accessed from a computer in your department a couple of seconds ago? Explain.P22.Consider distributing a file of F = 15 Gbits to N peers. The server has an upload rate of us= 30 Mbps, and each peer has a download rate of di= 2 Mbps and an upload rate of u. For N = 10, 100, and 1,000 and u = 300 Kbps, 700 Kbps, and 2 Mbps, prepare a chart giving the minimum distribution time for each of the combinations of N and u for both client-server distribution and P2P distribution.
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IP address, World Wide Web, Web server, Domain Name System, DNS servers, message body