Data Communications and Computer Networks (CSCI 462)

Apply the knowledge you gained throughout the CSCI 462 course to describe and analyze Internet networks as required.

Data Communications and Computer Networks (CSCI 462)
Student Name: _____________________________ ID#:______________________
Student Name: ______________________________ID#:______________________
Apply the knowledge you gained throughout the CSCI 462 course to describe and
analyze Internet networks as required.
Problem statement:
Propose one website of your interest: www._____________________
1) Application Layer
a. In the space below, attach a screenshot of the HTTP request message from
the browser to that website. Hint: use either Wireshark, Telnet, or an online
API tester tool.
(2 marks)
Screenshot:_________________________
b. What port number is used by the OS to communicate with this website
(websites in general)?
(0.5 mark)
Answer: ______________________________
2) Transport Layer:
a. Is the proposed website using TCP, UDP, or other protocols? Specify and give
a reason why is this protocol used considering service requirements such as
integrity, data rate, etc.
(1 marks)
Answer: ______________________________
b. Use Wireshark to validate the answer in part “a”. In the space below, attach
a screenshot showing the Wireshark transport layer protocols used for this
website.
(2 marks)
Screenshot: ______________________________
3) Network Layer:
a. Use the ping test to identify the packet transmission delay to that website in
millisecond notation. In the space below, attach a screenshot of the ping test
showing the measured delay.
(1 mark)
Screenshot: ______________________________
b. Use the tracert tool to show the number of hops to that website. In the space
below, attach a screenshot showing the tracert test.
(1 mark)
Screenshot: ______________________________
c. Run the ipconfig/all test and identify which of the following common
prefixes of private networks (10/8, 172.16, 192.168) is used for allocating IP
addresses within the LAN you are using?
(0.5 mark)
Answer: ______________________________
d. For the same ipconfig/all test. What is the subnet mask?
(0.5 mark)
Answer: ______________________________
e. What is the network class according to the subnet mask above?
(0.5 mark)
Answer: ______________________________
f. How many bits are used for the host portion of the IPv4 address? (1 mark)
Answer: ______________________________
g. How many bits are used to express the IPv6 address?
Answer: ______________________________
(1 mark)
4) Link Layer:
a. What network topology being used by the local network you are using (e.g.,
bus, star, ring)? Explain.
(1 mark)
Answer: ______________________________
b. The link layer labels each device with a unique number called MAC address.
Now, refer to the same ipconfig/all test and see if you can find that address.
What is that address called in this ipconfig/all test?
(0.5 mark)
Answer: ______________________________
5) Consider one of the big datacenter networks (e.g., youtube, amazon, facebook, etc).
Describe and attach a screenshot of the network architecture for that datacenter.
The screenshot MUST belong to that datacenter’s website (no third party
references). Use your own words to describe the datacenter network and mention
the protocols used at each of the five network layers.
(2.5 marks)
Screenshot: ______________________________
Explanation:______________________________