A type of attack where the adversary intercepts network packets, modifies them, and inserts them back into the network is called a; man-in-the-middle
The correct answer to this is called "a man-in-the-middle". This is also called a monster-in-the-middle or person-in-the-middle (PITM) attack and it is defined as a cyberattack whereby the person carrying out the attack secretly relates and alters the ongoing communications between two persons who believe that they are privately communicating with each other with no third party being privy to it.
An example of this type of attack is active eavesdropping to hear what people are saying in secret and using that information.
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