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Anti-Hacker Tool Kit, Fourth Edition by Mike Shema

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CHAPTER 10
NETWORK SNIFFERS AND INJECTORS
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The astronomer Carl Sagan was best known for popularizing science in a TV series called Cosmos. He’d often point to the sky and marvel at the “billions and billions” of stars beyond our own pale blue dot; marvel that the stars themselves are made of billions and billions of atoms—stardust—just like us.
The Internet has its own “billions and billions” of elements in the data packets that traverse it every day. While it’s easy to call this an “information highway,” that is a poor analogy. A vehicle enters a highway, follows a route, perhaps gets slowed by traffic, and finally exits once it reaches its destination. ...

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