Let us start with basics,
Why firewall?
Based on my first blog I am sure we know the answer for this.
To make it in one line “It is required to keep our environment safe”
Ok let’s go deeper.
It is Point at the perimeter where the incoming and outgoing packets are inspected, dropped and logged if required.
At Which Layer it works?
Generally, the answer is Layer 3 and Layer 4. But in recent days it can work up to application layer.
Guys! To know more about the OSI Layer refer to wiki link http://en.wikipedia.org/wiki/OSI_model
Types of Firewall:
ü Packet Filtering
ü Application Layer gateway
ü Stateful inspection firewall
Now I believe you understood the basic stuff about firewall. I will explain the types and product in my upcoming blogs.
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