OSI (Open Systems Interconnection)
Here is how the OSI is laid out and how the data is packaged, The top 3 layers deal with data, the first layer where encapsulation takes place is Layer 4 (Transport) as it prepares to leave the system.
Tracert - Traceroute Both of these are command-line tools. Both use ICMP for the discovery. Tracert Windows uses tracert for path discovery...
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