Final Exam -- closed book section -- 14 December

Problem 1 (3 points)

Under what circumstances is a network programmer likely to prefer UDP to TCP?

Problem 2 (10 points)

List five of the seven layers of the ISO Reference Model. For each layer, mention one aspect of networking covered in this class that fits within that layer.

Problem 3. (4 points)

Describe some features you'd expect to find in a good RPC architecture.

Problem 4. (3 points)

Last week someone told me that he needed to "put a telnet card into [his] computer." What is wrong with this?

Problem 5. (2 points)

Are there more class A IP networks than class C IP networks?

Problem 6. (20 points)

Give short, one or two sentence, descriptions of how the following routines are commonly used in Unix networking applications

• accept
• bind
• connect
• fork
• gethostbyaddr
• listen
• recvfrom
• select
• socket
• write

Problem 7. (1 point)

What does "IPng" abbreviate?

Problem 8. (5 points)

Name two major deficiencies in the present version of IP that IPng attempts to fix.

Problem 9. (3 points)

Here is one line of output from the Unix arp command:

• balsam.unca.edu (152.18.1.10) at 08-00-2b-24-e6-60

What is the meaning of this line?

Problem 10. (4 points)

Here is some output of the command

• traceroute owl.warren-wilson.edu

run on one of our local workstations:

           1  unca-gw.ncren.net (152.18.254.254)  4 ms  2 ms  2 ms
           2  wwc-gw.ncren.net (128.109.235.2)  28 ms  28 ms  28 ms
           3  owl.warren-wilson.edu (198.86.30.1)  29 ms  28 ms  27 ms

What does line 2 tell us?

Problem 11. (2 points)

How was ASN.1 used in one of the recently discussed protocols?

Problem 12. (5 points)

What is the "count to infinity" algorithm or, if you prefer, the "count to infinity" problem?

Problem 13. (2 points)

What do the acknowledgement numbers of TCP really enumerate -- bytes or records?

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