Question

In reality, network performance is limited by bandwidth, latency, jitters, congestions,
Errors and etc. Meanwhile the client also has the limitations due to resource load,
application interaction with TCP stack, and etc.
In this question, you will be tested for your familiarity in using Wireshark software for
packet capture and analyze the client’s TCP window size.
Instruction: Start packet capture in Wireshark application and download Ubuntu 18.04.2
image from this page: http://releases.ubuntu.com/bionic/.

Answer the following questions with proven screenshots:
(a) What is the Internet Protocol (IP) address of the URL of Ubuntu.com?
Answer Guide:
may use dnslookup + wirehshark to complete this action.

(b) What is the port number that the website/network service used?
Answer Guide: Kindly able to notice and differentiate between a simple HTTP, HTTPS,
TLS, and SSL. Some website may appear to use SSL/TLS for the comm. Provide a
screenshot to support your answer.

(c) How long does it take from the HTTP GET message was sent until the HTTP OK reply
was received for the ubuntu.com webpage that you visited?
Answer Guide: Inspect either the web is using HTTP/HTTPS or SSL/TLS and provide
your statement. The trick is, through the Wireshark. If there is no HTTP protocol
involves during the observation,

(d) Determine the TCP window size while downloading is still in progress. Determine the
steps taken to determine the TCP window size value with screenshot.
Answer Guide:
The Ubuntu ISO will be downloaded from a mirror. Please specify the mirror that you
are using at that moment. State the domain name, protocols involved, and the port
number.

(e) Provide a screenshot of TCP Window using I/O graph (Statistics > TCP StreamGraph
> Window Scaling Graph).
The window scaling graph shows the size of advertised receive window (including scaling
factor). The graph tells on how well the receiver can handle the received data.
Observation:

Answer 1

Answer A
**********
ubuntu ip = 91.189.88.166

Answer B
***********
Port number of source is 1762
Port number of dest is 80

http , dns , ip services are used

The differences between two protocols are less SSL and TLS are different standards. TLS uses stronger encryption algorithms and has the ability to work on different ports. TLS version 1.0 does not interoperate with SSL version 3.0.

Answer C
***********
HTTP GET and HTTP OK gets < 2 ms of time

Answer D
***********
TCP window size is 256

Answer E
***********

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