Assignment 2

                   CS494-unp  revised: 9/2/99

Assigned: 8/31/99
Due: 6:00pm 9/8/99 

Objective: readings and such 

Points: 26

Email your answers to randle@cs.utk.edu

Description:

1. What is max packet rate for 10 Mbs Ethernet for the minimum size packet?
   show your calculations.

2. What is maximum user-payload data rate (Mbits/sec) for the 
   maximum size packet over 10 Mbs Ethernet?  show your calculations.

3. What is the minimum packet roundtrip time for adjacent workstations on a
   10 Mbs Ethernet?  show your calculations

4. How does the Ethernet packet layout, broadcast address, and data rate
   described in the Metcalfe/Boggs paper differ from that in the current
   Ethernet specification?

5. What does the required reading (Ross's online book) say the reason is
   for using exponential backoff after an Ether collision?

6. What is the Ethernet address of cetus1c (use arp -a from another
   CS machine and "paste" the output into your answer)? 
   What do you suspect is the 3-byte Sun Ethernet vendor code.

7. Use netstat -r to find the default router for the CS subnet?
   What is the default router's Ethernet address?

8. Using netstat -i on cetus1a and kenner, compare the
   Collis(ion) column for the Ethernet interface (hme0/le0).

9. What is the subnet address range of the CS engines?
   (use ifconfig on one of the cetus/hydra boxes)
   How many host addresses are possible in this subnet?

10. From one of the CS machine use the following
     lynx http://sunstats.cern.ch/cgi-bin/nph-traceroute.pl
   to trace the route from sunstats.cern.ch to the CS machine.
   Now on the CS machine run 
     traceroute sunstats.cern.ch
   (paste the results of both traces into your answer for this question).
   Are the routes the same in both directions?
   Based on the traceroute times from the CS machine, what are the
   the routers on each side of the Atlantic.
   How long does that hop take?
    alternate site: http://www.nbi.dk/cgi-bin/traceroute.pl

11. Ping sunstats.cern.ch for bout 30 packets.
    What does ping report as the min/max/avrg roundtrip time?
    What things might contribute to the variation in round-trip times?