TDC 375-701                   Student Name:
Homework 6
Due 2009-11-04

From TCP/IP Protocol Suite, 4th Edition, answer:
19.15  Questions 1, 3, 5, 7

Also answer the following questions:

Q. Using nslookup or dig on your own machine or a machine you have
   access to, perform the following query and show the full output
   of the results:

      nslookup -recurse whoami.ultradns.net

   or

     dig whoami.ultradns.net


Q. Describe the features of the DNS and/networks as they are commonly
   deployed that makes distributed denial of service (DDoS) attacks
   possible, by using open resolvers (or really most any type of
   publicly accessble DNS server) as both amplification and reflector
   relays?



Q. What are the IPv4 addresses of all 13 Internet root DNS servers?



Q. In what circumstance(s) are you most likely to see DNS be
   encapsulated in TCP?



Q. Would it make sense to have the 'qr' (query/response) flag cleared
   and the 'aa' (authoritative answer) flag set in a DNS query message?
   Yes or no?



Q. Would it make sense to have the 'qr' (query/response), 'aa'
   (authoritative answer), 'rd' (recursion desired) and 'ra' (recursion
   available) flags all set in any DNS message?  Yes or no?



Bonus Question (worth 20 points)

Show the network prefix route announcement, originating ASN and
originating AS (the organization name) for each of the 13 different
root DNS servers.  Be sure to indicate where you got this information.



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