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Eavesdropping occurs when a hacker is able to see the information contained within a packet. One way of preventing eavesdropping is to encrypt the information that is being sent.
- Network layer encryption encodes the packet payload.
- A router or firewall encrypts and decrypts packets.
- A hacker with a packet sniffer can only see ciphertext in the packet payload.
- The IP and transport layers remain in clear text format, so the packet can find its way to the destination address.
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