EE 450 Homework 1
Summer ’09
●
Nazarian
Name: _________________________________________
Lecture 8:00
Assigned: Thursday June 4, 2009
Score: ________
Due: Thursday
June 11, 2009, 8:00 am
1. (5 points) What is the difference between a host and an end system? List
the types of end systems. Is a web server an end system?
2. (each part 5 points)
(a) What is network topology?
(b) Write at least 5 different topologies.
(c) Which topology is the most expensive?
3. (each part 5 points)
This elementary problem begins to explore propagation delay and
transmission delay, two central concepts in data networking. Consider two
hosts, A and B, connected by a single link of rate
R
bps. Suppose that the
two hosts are separated by
m
meters, and suppose the propagation speed
along the link is
s
meters/sec. Host A is to send a packet of size
L
bits to
Host B.
(a) Express the propagation delay,
d
prop
in terms of
m
and
s
.
(b) Determine the transmission time of the packet,
d
trans
in terms of
L
and
R
.
(c) Ignoring processing and queuing delays, obtain an expression for the
endtoend delay.
(d) Suppose Host A begins to transmit the packet at time
t=0
. At time
t=d
trans
, where is the last bit of the packet?
(e) Suppose
d
prop
is greater than
d
trans
. At time
t=d
trans
, where is the first bit of
the packet?
(f) Suppose
d
prop
is less than
d
trans
. At time
t=d
trans
, where is the first bit of
the packet?
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '06
 Zahid

Click to edit the document details