Homework 2
              Due: September 25

1-7 carry 10 points each and 10th carries 70 points

3.14 a,b,c,e

3.30

3.32

3.42

3.60

5.20

5.22

8. Implement a simple TFTP (a UDP based file transfer protocol ) server 
which just accepts "read" requests from clients. Use the available tftp 
client for all unix based machines.

You may use eesun1 and eesun3 as your client and server machines. By 
default the tftp client for unix based machines connects to port 69 
(as it is default port for tftp server). Your server runs on your custom port
(like in HW-1 10,000 + last 4 digits of your ID).

Read RFC 1350 for packet format details (As the client talks to you 
according to the RFC)

As communication over UDP is unreliable, implement the GO-BACK-7 ARQ to 
make the communication reliable. i.e., The client requests for a file 
and the server writes to the client using GO-BACK-7 scheme. To test your 
ARQ mechanism, send a sequence of packets
with a missing sequence number. Show the result of a retransmission.

Running tftp client:

Do this on the shell prompt
$ tftp
 > connect eesun3 [port number] (your custom port number)

 > get <file-path>

you may use other options like 'trace' and 'verbose' to see how the 
client sends the packets