This post is aimed at the basic understanding of the Firewall and its types.
What is the purpose of using firewall?
Firewall is just another security guard for the system which prevents the in and out of "bad" elements from our system. A company can have many LANs connected in arbitrary ways, but all the traffic to or from the company must be forced through an electronic drawbridge- firewall.
Types of firewall:
1. Circuit level gateway (CGW)-
This operates at the physical layer of the system.
Since physical layer deals with the bits, its main task is bit-level checking.
2. Packet filter-
It opeartes at the network layer.
The main job is to check the packet headers for errors.
3. Application layer gateway(AGW)-
As the name suggests, it functions at the application layer and performs the job of content based checking where the end user operates.
4.Bastion host-
This one can be said to be a hybrid of CGW and AGW.
The next post is all about the detailed configurations of firewall. Stay tuned, breaching to you soon!
What is the purpose of using firewall?
Firewall is just another security guard for the system which prevents the in and out of "bad" elements from our system. A company can have many LANs connected in arbitrary ways, but all the traffic to or from the company must be forced through an electronic drawbridge- firewall.
Types of firewall:
1. Circuit level gateway (CGW)-
This operates at the physical layer of the system.
Since physical layer deals with the bits, its main task is bit-level checking.
2. Packet filter-
It opeartes at the network layer.
The main job is to check the packet headers for errors.
3. Application layer gateway(AGW)-
As the name suggests, it functions at the application layer and performs the job of content based checking where the end user operates.
4.Bastion host-
This one can be said to be a hybrid of CGW and AGW.
The next post is all about the detailed configurations of firewall. Stay tuned, breaching to you soon!
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