Ethereal is a free packet sniffer that allows you to capture traffic on a local area network.

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Ethereal is a free packet sniffer that allows you to capture traffic on a local area network.

It can be used on a variety of operating systems and is available at www.

ethereal.com.You must also install the WinPcap packet capture driver, which can be obtained from http://winpcap.mirror.ethereal.com/.

After starting a capture from Ethereal, start a TCP-based application like telnet, FTP, or http (Web browser). Can you determine the following from your capture?

a. Source and destination layer 2 addresses (MAC)

b. Source and destination layer 3 addresses (IP)

c. Source and destination layer 4 addresses (port numbers)

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