3. a. (5pts) The DNS root hints file is a file that all DNS resolvers have to be able to boot- strap their resolution abilities. It is located at http://www.internic.net/domainamed.root, and it has entries for each root server as such: A. ROOT-SERVERS.NET. A.ROOT-SERVERS.NET. 3600000 3600000 3600000 NSA.ROOT-SERVERS.NET. A 198.41.0.4 AAAA 2001:503:ba3e: :2:30 B.ROOT-SERVERS.NET. B.ROOT-SERVERS.NET. 3600000 3600000 3600000 NS B.ROOT-SERVERS.NET. A 199.9.14.201 AAAA 2001:500:200::b If you have only this file, how can you use the information in it, and dig, to look up www.facebook.com? List the steps you need to take along with the answer you might get), using the syntax dig +norecursive. b. Suppose you run a website at www.foo.net: i (2pts) Which name servers need to change their databases if you decide to change the name to www.foo.com? ii (1pt) To web.foo.net? iii (2pts) What needs to change if you decide to keep the name www.foo.net, but change the IP address? c. (1pt) Explain why using a DNS resolver out on the Internet (i.e., open resolver) can result in poor choice of CDN servers. 3. a. (5pts) The DNS root hints file is a file that all DNS resolvers have to be able to boot- strap their resolution abilities. It is located at http://www.internic.net/domainamed.root, and it has entries for each root server as such: A. ROOT-SERVERS.NET. A.ROOT-SERVERS.NET. 3600000 3600000 3600000 NSA.ROOT-SERVERS.NET. A 198.41.0.4 AAAA 2001:503:ba3e: :2:30 B.ROOT-SERVERS.NET. B.ROOT-SERVERS.NET. 3600000 3600000 3600000 NS B.ROOT-SERVERS.NET. A 199.9.14.201 AAAA 2001:500:200::b If you have only this file, how can you use the information in it, and dig, to look up www.facebook.com? List the steps you need to take along with the answer you might get), using the syntax dig +norecursive. b. Suppose you run a website at www.foo.net: i (2pts) Which name servers need to change their databases if you decide to change the name to www.foo.com? ii (1pt) To web.foo.net? iii (2pts) What needs to change if you decide to keep the name www.foo.net, but change the IP address? c. (1pt) Explain why using a DNS resolver out on the Internet (i.e., open resolver) can result in poor choice of CDN servers