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How many methods used to control traffic flowing into and out of the network by firewall?
Firewalls utilize one or more of three ways to control traffic flowing into and out of the network as given below:
1. Packet filtering: Packets i.e., small chunks of data are analyzed against a set of filters.
2. Packets which make this through the filters are sent to the requesting system and all others are rejected.
3. Proxy service: Information through the Internet is retrieved via the firewall and after that sent to the requesting system and as vice versa
4. Stateful inspection: A newer method which doesn't inspect the contents of each packet but in its place compares exact key parts of the packet to a database of trustable information.
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