Project description
the assignment is 15 quastions i need you to to answer it as well and see the text book as aresorce : Computer Networking: A Top-Down Approach, 6
th Edition by James F. Kurose and
Keith W. Ross, Addison-Wesley 2012
1, (6 points) List six access technologies. Classify each one as residential access,
company access, or wide area wireless access.
2 Is HFC transmission rate dedicated or shared among users? Are collisions
possible in a downstream HFC channel? Why or why not.
3 What is the transmission rate of Ethernet LANs?
4 Suppose there are exactly two packet switches between a sending host and a receiving host. The transmission rate
between the sending host and switch #1 is R1. Thetransmissions rate between switch#1 and switch#2 and between
switch #2 and the receiving host are R2 and R3, respectively. Assuming that the switch
es user store -and forward packet switching, what is the total end to end delay to send a packet of length L?
(Ignore queuing, propagation delay, and processing delay.)
5
propagation speed
(a)
How long does it take for a packet of length 2,048 bytes to propagate over a
link of distance 2,400 km, propagation speed 2.5×10 8m/s, and transmission rate
2Mbps?
(b)
More generally, how long does it take a packet of length L to propagate over a
link of distance d, propagating speed s, and transmission rate R bps?
(c) Does this propagation delay depend on packet length?
(d)Does this propagation delay depend on transmission rate?
6 Suppose Host A wants to send a large file to Host B. The path from Host Ato Host B has three links, of rate R1=
512 kbps, R2=1.5 Mbps, and R3=1Mbps.
(a)
Assume no other traffic in the network, what is the throughput for the file transfer?
(b)
Suppose the file is 4MB (consider 1MB = 106 bytes). Dividing the file size by the
throughput, roughly how long will it take to transfer the file to Host B?
7
, Suppose users share a 2Mbps link. Also suppose each user requires 1Mbps when
transmitting, but each user transmits only 30% of the time. (See the discussion of
statistical multiplexing in Section 1.3)
a, When circuit switching is used, how many users can be supported?
b, For the remainder of this problem, suppose packet switching is used. Why
will there be essentially no queuing delay before the link if two or fewer users transmit at
the same time? Why will there be a queuing delay if three users transmit at the same time?
c, Find the probability that a giving user is transmitting.
d, Suppose now there are three users. Find the probability that at any given
time, all three users are transmitting simultaneously. Find the f
raction of time during which the queue grows.
8
, consider the circuit- switched network in Figure 1.8 below. Recall that there are n circuits on each link.
a, what is the maximum number of simultaneous connections that can be in progress at any one time in this network?
b, Suppose that all connections are between the switch in the upper-left-hand corner and the switch in the lower
– right – hand corner. What is the maximum number of simultaneous connections that can be in progress?
9 What information is used by a process running on one host to identify a
process running on another host?
10 Why is it said that FTP sends control information “out- of-band”?
11 True or false? Why?
a, A user requests a Web page that consists of some text and one image. For this page, the
client will send one request message and receive 2 response messages.
b,
Two distinct Web pages (for example,www.nova.edu/resources/current_students.html and www.nova.edu/resources/faculty_staff.html ) can be sent over the same persistent connection.
c, With nonpersistent connections between browser and origin server, it is possible for a
single TCP segment to carry two distinct HTTP request messages.
d, The Date: header in the HTTP response message indicates the time and date when the
HTTP response was created and sent by the server.
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Jermaine Byrant
Nicole Johnson
OVER
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