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Passive and Active Sniffing Before we look at passive and act | Hackers Private Link

Passive and Active Sniffing

Before we look at passive and active sniffing, let’s look at two major devices used to network computers; hubs and switches.

A hub works by sending broadcast messages to all output ports on it except the one that has sent the broadcast. The recipient computer responds to the broadcast message if the IP address matches. This means when using a hub, all the computers on a network can see the broadcast message. It operates at the physical layer (layer 1) of the OSI Model.

The diagram below illustrates how the hub works.