Start with a root DNS server (from one of the root servers [a-m].root-servers.net), initiate a sequence of queries for the IP address for your department’s Web server by using dig. Show the list of the names of DNS servers in the delegation chain in answering your query. (b)(6 pt.) 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 come up with a way to determine if an external Web site was very likely accessed from a computer in your department a couple of seconds ago? Explain. 5.(18 points) Client-Server vs. P2P file distribution. Consider distributing a file F=15 Gbits to Npeers. The server has an upload rate of us=30Mbps, and each peer has a download rate of di= 2Mbps and an upload rate of u. For N=10, 100, and 1000, and u=300 Kbps, 700 Kbps, and 2 Mbps, prepare a chart giving the minimum distribution time for each of the combination of Nand ufor both client-server distribution and P2P distribution.
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IP address, World Wide Web, Web server, Domain Name System