Learning by Doing: CISCO Certified Network ... - SCN Research

Notice how we have three frames within the window. The top one shows us basic overall
information about the packets captured. When we highlight on we are asking Ethereal
to show us the contents of that packet. The middle frame is more user friendly. It shows
us block by block what we are looking at. The bottom frame shows us the hexadecimal
composition of the actual packet.
Supplemental Labs or Challenge Activities:
1. Go to the Ethereal website and find the sample packets. Get the one on IPv6.
How does it differ from IPv4?
2. Go to the web and look up 2001 Senate Bill 1562 that allows any law
enforcement agent to “capture” packets from the internet at any time for any
purpose…no subpoena required. They say they can only look at the first 65
bytes of header and footer information but we know better. Using your
protocol inspector find out how much they can really see and cannot see.
3. We’ve looked at Ethernet packet structure. Go out and research icmp packet
structures.
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