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Describe the difference between a network switch and a network hub. Then explain how switched networks limit the network traffic that is visible to Wireshark in comparison to networks that used hubs. (Note – switches are the technology used in today’s computer networks)

Wireshark Capture Filter assignment

This assignment requires students to:

· Become familiar with Wireshark capture filters.

· Document the qualifiers used in capture filters.

· Construct and use capture filters to capture specific network traffic.

· Include screen shots of captured network traffic and present them with associated discussion.

Part 1 – Wireshark and traffic capture basics

Describe what the term promiscuous mode means in relation to capturing network traffic with Wireshark and similar network traffic analysers.

[ 1 mark ]

The Capture > Options dialog allows the Name Resolution of Network Layer names. Describe what this means and describe how it could be used for capturing network traffic.

[ 1 mark ]

Describe the difference between a network switch and a network hub. Then explain how switched networks limit the network traffic that is visible to Wireshark in comparison to networks that used hubs. (Note – switches are the technology used in today’s computer networks)

[ 2 marks ]

In TCP/IP networking IP addresses are used to identify specific computers (or hosts) on the network, clients use ports numbers to specify a particular instance of a client program (for example a specific tab on a web browser) and servers normally use well known port numbers  on which to listen for client requests. For instance ftp at the server uses ports 20 and 21.

From the web or any other source determine the well-known port numbers of the following server programs:

· ftp data

· ftp control

· http

· NTP

· ssh

Also find the well know port numbers for 6 other network protocols and describe the function that each protocol performs.

[ 2 marks ]

 


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