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What are the different types of sniffing?

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There are two types of Sniffing:

  1. Active sniffing: It is used in a switch-based network. A switch is a point to point network device. In the active sniffing, the traffic is locked, monitored, and may be altered in some way determined by the attack. 
  2. Passive sniffing: It involves sniffing through the hub. In Passive sniffing, the traffic is locked but not at all altered. Any traffic that is passing through the unbridged or non-switched network segment can be seen by all the machines on the segment. In this, sniffers operate at the data link layer of the network.

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