A firewall is a cybersecurity tool that filters network traffic and can separate internal and external traffic sources. There are several types of firewalls including packet filtering, circuit-level gateway, stateful inspection, proxy, and next-gen firewalls. Firewalls can be implemented as software, hardware, or cloud-based solutions. They protect devices from unauthorized access, block unwanted content, and help keep private information secure. The appropriate firewall type for an organization depends on its needs and tolerances regarding protection capabilities and performance impacts.

1. Submitted By
Pawan Suresh Nishad
Department of computer studies & research
Sardar patel mahavidyalaya, chandrapur
Session
2022-2023

3. To be discuss
 What is firewall
 Why do we need a firewall
 Types of firewall
 Methods of delivering firewall

4.  A firewall is a type of a cyber security tool that is used
to filter traffic on a network
 Firewall can be used to separate network nodes from
external traffic source, internal traffic source, or even
in specific applications.
 Firewall can be software, hardware, or cloud based,
either each type of firewall having its own unique pros
and cons.

5. Why do we needa firewall
 Protects yours computer from unauthorized access.
 Blocks unwanted content
 Prevents ransom ware from gaining traction
 Creates a secure network for multi-person interaction,
such as online video games
 Helps keep your private information such as online
banking credentials or social security number safe.

6. Types of firewall
 Packet filtering firewall
 Circuit level gateway
 State full inspection firewall
 Application level gateway(a.k.a. proxy firewall)
 Next gen firewall

7. Packet-filteringfirewall
 As the most “basic” and oldest type of firewall
architecture, packet filtering firewalls basically create
a checkpoint at a traffic router or switch.
 The firewall performs a simple check of the data
packets coming through the router- inspecting
information such as the destination and origination IP
address, packet type, port number,and other surface-
level information without opening up the packet to
inspect its contents.

8. Circuit-level gateway
 As another simplistic firewall type that is meant to
quickly and easily approve or deny traffic without
consuming significant computing resources, circuit-
level gateway work by verifying the transmission
control protocol(TCP) handshake. This TCP handshake
check is designed to make sure that the session the
packet is from is legitimate.

9. StatefulL inspectionfirewalls
 These firewalls combine both packet inspection
technology and TCP handshake verification to create a
level of protection greater than either of the previous
two architectures could provide alone.
 However, these firewalls do put more of a strain on
computing resources as well. This may slow down the
transfer of legitimate packets compared to the other
solutions.

10. Proxyfirewalls
 Proxy firewalls operate at the application layer to filter
incoming traffic between your network and the traffic
source hence, the name “application-level gateway.”
these firewalls are delivered via a cloud-based solution
or another proxy device. Rather than letting traffic
connect directly, the proxy firewall first establishes a
connection to the source of the traffic and inspect the
incoming data packet.

11. Next generationfirewalls
 Firewall architectures include deep-packet inspection,
TCP handshake checks, and surface-level packet
inspection. Next-generation firewalls may include other
technologies as well, such as intrusion prevention
systems(IPSs) that work to automatically stop attacks
against your network.

12. Methodsof deliveringfirewall
 Software firewalls
 Hardware firewalls
 Cloud firewalls

13. Software firewalls
 Software firewalls include any type of firewall that is
installed on a local device rather than a separate piece
of hardware
 However, maintaining individual software firewall on
different devices can be difficult and time-consuming.
Furthermore, not every device on the network may
mean having to use several different software firewalls
to cover every asset.

14. Hardware firewalls
 Hardware firewalls use a physical appliance that acts
in a manner similar to a traffic router to intercept data
packets and traffic requests before they’re connected
to the network’s servers.
 The actual capabilities of a hardware firewall may vary
depending on the manufacturer- some may have a more
limited capacity to handle simultaneous connections
than others.

15. Cloudfirewalls
 Whenever a cloud solution used to delivered a firewall
it can be called as cloud firewall or firewall as a
service(FaaS) cloud firewall are considered
synonymous with proxy firewalls by many, since a
cloud server is often used in a proxy firewall setup.

16. Whichfirewallis right for my company
 The simple packet filtering or circuit-level
gateway, which provides basic protection
that has minimal performance impact.
 The state full inspection architecture that
combines the capabilities of both of the
previous two options, but has a larger
performance impact.
 A proxy or next-gen firewall that offers far
more robust protection in exchange for
additional expenses and an even higher
performance impact.