What are the basic types of firewalls?

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[Rosie667]

Conceptually, there are three types of firewalls:

Network layer
Application layer
Hybrids
They are not as different as you might think, and latest technologies are blurring the distinction to the point where it's no longer clear if either one is ``better'' or ``worse.'' As always, you need to be careful to pick the type that meets your needs.

Which is which depends on what mechanisms the firewall uses to pass traffic from one security zone to another. The International Standards Organization (ISO) Open Systems Interconnect (OSI) model for networking defines seven layers, where each layer provides services that ``higher-level'' layers depend on. In order from the bottom, these layers are physical, data link, network, transport, session, presentation, application.

The important thing to recognize is that the lower-level the forwarding mechanism, the less examination the firewall can perform. Generally speaking, lower-level firewalls are faster, but are easier to fool into doing the wrong thing.

These days, most firewalls fall into the ``hybrid'' category, which do network filtering as well as some amount of application inspection. The amount changes depending on the vendor, product, protocol and version, so some level of digging and/or testing is often necessary.

[ronyyroyals]

 There are two types of firewalls:
1) Network layer;
2) Application layer.
which implement various types of security policies. The firewall itself is immune to penetration to it's security.

[Blake_Brice]

Conceptually, there are two types of firewalls:

1.
    Network layer
2.
    Application layer

They are not as different as you might think, and latest technologies are blurring the distinction to the point where it's no longer clear if either one is ``better'' or ``worse.'' As always, you need to be careful to pick the type that meets your needs.

Which is which depends on what mechanisms the firewall uses to pass traffic from one security zone to another. The International Standards Organization (ISO) Open Systems Interconnect (OSI) model for networking defines seven layers, where each layer provides services that ``higher-level'' layers depend on. In order from the bottom, these layers are physical, data link, network, transport, session, presentation, application.

[barrlowgeorge]

Following are the basic types of firewalls:
1.Network layer : make their decisions based on the source address, destination address and ports in individual IP packets.

2.Application layer : host running proxy servers.Do not permits traffics directly between networks.

3.Proxy : traffic does not flow through a proxy.  Computers establish a connection to the proxy,  serving as an intermediary.

4.UTM(UNIFIED THREAT MANAGEMENT) : These devices permit integration, convenience and protection from threats and are especially valuable to small and medium-sized businesses.