Name (Print) ______________________________
Email Address
ECE4110, Internetwork Programming, QUIZ 2 - PRACTICE
Spring 2006
Prof. John A. Copeland Practice for April 11, 2006
Tel.: 404-894-5177
E-Mail: copelan[email protected]ch.edu
RULES.
i This quiz is not open book. One original sheet of hand-written notes may be used. Calculators are ok.
ii Answer all questions and show all work to receive full credit. Use back of sheets only if necessary.
iii All sub-questions have the same weight.
iv Please do not ask the proctors any questions during the exam about exam questions. Part of the test is
understanding the question, as written, without supplemental information. If you feel additional data is needed to solve the
problem, make (and state) an assumption and then work the problem.
v. This is a time-limited test. All papers must be turned in 50 minutes after the start. If you find you are
taking more than 10 minutes on a particular problem, move on and come back to that problem after finishing the others.
The Georgia Honor Code applies (see last page). The actual test will be about 60% as long as this.
Question 1 โ TCP with no Congestion.
A 100 Mbps network connection has a 100 ms round trip time (RTT). A server begins sending maximum-size packets
(after the initial SYN-ACK) using Slow Start. The client ACK's every packet (col. 2) or every-other (col.3), and has a
receiver-window which holds 16 maximum-size packets. Show how many packets are sent in each RTT period below:
Time Period Start (ms) No. Segments, when all ACKed No. Segments, when 1/2 ACKed
0 1 1
100
200
300
400
500
600
_____________ How long does it take the server to ramp up to maximum transfer rate (ms).
_____________ If the maximum packet size is 1000 bytes, what is the maximum transfer rate (bytes/second).
How and when is the receiver's maximum segment size (MSS) sent to the sent to the other host?
How? _____________________________ When _________________________________________
How and when is the receiver's TCP window (WIN) sent to the sent to the other host? ?
How? _____________________________ When _________________________________________
The last WIN received was 8000, the last ACK number was 12000, and the last TCP segment sent had a SEQ number of
14000. How many more bytes can be sent? ___________________
Once those bytes are sent, name three conditions that will allow additional bytes to be sent:
a. __________________________ b.____________________________ c. ____________________________
A TCP host on an Ethernet LAN receives an MSS of 1460 bytes. It sends IP headers with no options (20 bytes) and TCP
headers with 32 bytes (12 bytes for options). What is the maximum number of data bytes (SMSS) it can send per TCP
segment? _______________________________________________
ECE4110 Quiz 2 PRACTICE p. 1
