Lab1-Intro: Spring 2022 COSC 370-001 COMPUTER NETWORKS

	Attempt	Time	Score
KEPT	Attempt 3	less than 1 minute	30 out of 30 *
LATEST	Attempt 3	less than 1 minute	30 out of 30 *
	Attempt 2	2 minutes	26 out of 30 *
	Attempt 1	12 minutes	24 out of 30 *

Intro-1 Lab: Q01 Introduction and protocols seen in trace

You must read the 1-Wireshark_Intro lab manual, before answering these questions.

The answers to the questions in this lab are based on packets in the trace file intro-wireshark-trace-1, which is posted with this lab manual under MyClass/Modules. So make sure you have this specific trace file downloaded and open in Wireshark when you answer these questions!

Which of the following protocols appear (i.e., are listed in the Wireshark “protocol” column) in the trace file?

TCP

QUIC

HTTP

DNS

UDP

TLSv1.2

Nice! This answer is correct!

Intro-1 Lab: Q02 HTTP response time. How long did it take from when the HTTP GET message was sent until the HTTP OK reply was received?

By default, the value of the Time column in the packet-listing window is the amount of time, in seconds, since Wireshark tracing began.

Enter your answer in the form of "0.xyz" (without quotes) where xyz are the three first decimal places (in subseconds) of the HTTP response time. Calculate your answer using the six decimal places of subsecond time precision, and then enter your answer rounded (not truncated) to three subsecond decimal places, 0.xyz:

Your Answer:

0.029

Intro-1 Lab: Q03.1 Server IP address. What is the Internet (IP) address of the web server gaia.cs.umass.edu (also known as www-net.cs.umass.edu)? Enter the address in so-called dotted decimal notation of the form w.x.y.z, where w, x, y, and z are integers between 0 and 255. Omit leading zeros (except if the value of w, x, y or z is zero); include the periods in your answer:

Nice! This answer is correct!

Intro-1 Lab: Q03.2 Client IP address. What is the Internet (IP) address of the client that sent the HTTP request to the gaia.cs.umass.edu server? Enter the client's address in so-called dotted decimal notation of the form w.x.y.z, where w, x, y, and z are integers between 0 and 255. Omit leading zeros (except if the value of w, x, y or z is zero); include the periods in your answer:

Nice! This answer is correct!

Intro-1 Lab: Q04 Which web browser?

Expand the information about the HTTP message in the Wireshark “Details of selected packet” window (see Figure 3 in the lab manual) so you can see the fields in the HTTP GET request message. What type of Web browser issued the HTTP request? The answer is shown at the right end of the information following the “User-Agent:” field in the expanded HTTP message display.

Safari

Firefox

Microsoft Edge

None of these answers.

Nice! This answer is correct.

Intro-1 Lab: Q05 What port number? Expand the information about the Transmission Control Protocol in the Wireshark “Details of selected packet” window (see Figure 3 in the lab manual) so you can see the fields in the TCP segment carrying the HTTP message. What is the destination port number (the number following “Dest Port:” for the TCP segment containing the HTTP request) to which this HTTP request is being sent?

80

23

242

53962

Nice! This answer is correct.

* Some questions not yet graded
Time:	less than 1 minute
Current Score:	30 out of 30 *
Kept Score:	30 out of 30