A message down the stack

The OSI model splits networking into seven layers. Each one adds something to the message, and each one has its own attacks and its own controls.

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Missions

Pick a guided trail. The map points at your next stop.

Walk down the stack
Visit all seven layers, from the cable to the application.
0/7
Harden the edge
Fix a firewall, a TLS configuration and a DNS server.
0/3
Read the wire
Understand the handshake, spot a scan and see how amplification works.
0/3