Exercise 10

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0. (1)     A machine with one IP address have multiple DNS names (i.e. aliases). Give an example DNS database.

1. (1)     Can a machine with one DNS name have multiple IP addresses? How can this occur?

2. (1)     DNS uses UDP instead of TCP. If a DNS packet is lost, there is no automatic (on the part of UDP) recovery. Does this cause a problem, and if so, how is it solved.

3. (2)     Give two reasons for multiple DNS servers with identical information.

4. (2) Suppose you want to send a 4MB MP3 file to a friend but your friend's ISP limits the amount of incoming mail to 1 MB. Is there a way to handle using RFC822 and MIME?

5. (3) Write a JavaScript program to determine if an integer less than 2 is prime.

6. (1) Define XML that corresponds to your family hierarchy as specified in the tree below. Give the person's name, for example: <Name>Ray Wisman</Name>

7. (1) Can two individuals use public-key cryptology to sign a document and send to a third party? Explain.

8. (1) A vacation daemon sends out of office replies to emails. A user sends an email to someone running a vacation daemon, starts their own vacation daemon and logs out for the summer. Will the two daemons trade out of office replies until someone returns from vacation?