What is a Firewall_ the Different Firewall Types

1. What is a Firewall? The Different Firewall Types
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2. What is a Firewall? The Different Firewall Types
A firewall is a security layer that functions as a barrier between private networks and the rest of the world. Firewall
architectures have progressed dramatically over the last four decades, from first-generation, stateless firewalls to
next-generation firewalls. Organizations can now choose from a variety of firewall types, such as application-level
gateways (proxy firewalls), stateful inspection firewalls, and circuit-level gateways, and even combine them for a
deep-layer, comprehensive security solution. A firewall is mandatory in a business infrastructure as it protects a
company’s network and computers from cyber threats and malicious network traffic. Cyber legend technologies
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3. What is a Firewall?
Firewalls are used to secure a computer network, just as fencing protects your home and keeps trespassers at bay.
Firewalls are network security technologies that protect a network from illegal access. It can be a hardware or
software device that filters incoming and outgoing data within a private network based on a set of criteria in order
to detect and prevent cyberattacks. In both business and personal situations, firewalls are used. They’re an
important part of network security. A rudimentary firewall is included in most operating systems. Using a third-
party firewall application, on the other hand, gives superior protection.

4. Software Firewalls
On the host device, a software firewall is deployed. As a result, a Host Firewall is another name for this type of
firewall. It must use its resources to work because it is tied to a certain device. As a result, it will inevitably
consume some of the system’s RAM and CPU. You must install the programme on each device if you have more
than one. It requires specific configuration for each since it must be compatible with the host. As a result, the most
significant disadvantage is the time and expertise required to administer and manage firewalls for each device.
Software firewalls, on the other hand, have the advantage of being able to discriminate between applications while
filtering incoming and outgoing traffic.

5. Hardware Firewalls
Hardware firewalls, on the other hand, are physical devices with their own computer resources.
They serve as a link between internal networks and the internet, filtering out data packets and
traffic requests from untrusted sources. Physical firewalls are useful for businesses with a large
number of devices on the same network. They do not protect against insider attacks since they filter
malicious communication before it reaches any endpoints. As a result, a mix of software and
hardware firewalls can provide effective network protection for your company.

6. Packet filtering firewall
Packet filtering firewalls are installed inline at places where devices like routers and switches
perform their functions. These firewalls, on the other hand, do not route packets; instead, they
compare each packet received against a list of predetermined criteria, such as authorised IP
addresses, packet type, port number, and other features of packet protocol headers. Troublesome
packets are often dropped indiscriminately, that is, they are not sent and therefore cease to exist.

7. Circuit-level Gateways
Circuit-level gateways are another sort of simplified firewall that can be set to allow or block traffic without
spending a lot of CPU power. These firewalls typically validate TCP (Transmission Control Protocol) connections
and sessions at the session level of the OSI model. Circuit-level gateways are intended to keep established sessions
safe. Circuit-level firewalls are typically implemented as security software or as firewalls that already exist. These
firewalls, like packet-filtering firewalls, do not check for actual data, but they do analyse transaction information.
As a result, data containing malware that uses the right TCP connection will flow via the gateway. As a result,
circuit-level gates are not deemed secure enough to safeguard our systems.