It data security

1. Firewalls
Lakshay yadav
201302057
Btech Cse aiml

2. Introduction
• A firewall is a network security system, either hardware- or
software-based, that controls incoming and outgoing network
traffic based on a set of rules.
• Network firewalls are frequently used to prevent
unauthorized Internet users from accessing private networks
connected to the Internet, especially intranets.
• All messages entering or leaving the intranet pass through
the firewall, which examines each message and blocks those
that do not meet the specified security criteria.

3. Why firewall security..?
• Remote login
• Application backdoors
• SMTP session hijacking
• Operating system bugs
• Denial of service
• Viruses

4. Types of firewalls
•Hardware firewalls
•Software firewalls

5. Hardware firewall
• Hardware firewalls can be purchased as a stand-alone
product but are also typically found in broadband routers,
and should be considered an important part of your system
and network set-up.
• Most hardware firewalls will have a minimum of four network
ports to connect other computers, but for larger networks,
business networking firewall solutions are available.

6. Software firewall
• Software firewalls are installed on your computer (like any
software) and you can customize it; allowing you some
control over its function and protection features. A software
firewall will protect your computer from outside attempts to
control or gain access your computer.
• New generation Operating systems come with built in
firewalls or you can buy a firewall software for the computer
that accesses the internet or acts as the gateway to your
home network.

7. Advantages
• Low cost.
• Packet filters make use of current network routers.
• Makes Security Transparent to End-Users.
• Easy to install. High speed
• Packet filters make use of current network routers. Therefore
implementing a packet filter security system is typically less
complicated than other network security solutions.
• Packet filters are generally faster than other firewall
technologies because they perform fewer evaluations.

8. Disadvantages
• Packet filtering by a software firewall can degrade your system's
performance, because it's a demanding task to examine every
packet of data.
• Whichever option you choose, configuring and maintaining the
firewall can be a difficult
• A network firewall also can lend users a false sense of security,
encouraging them not to maintain security at the machine level. If
the network firewall fails or is not configured properly, this could
prove disastrous.
• Sometimes difficult to remove or un-install a firewall completely.

9. Conclusion
• Firewalls are a must have for any kind of computer usage
that go online. They protect you from all kinds of abuse &
unauthorised access like trojans that allow taking control of
your computers by remote logins or backdoors, virus or use
your resources to launch DO S attacks.
• Firewalls are worth installing. Be it a basic standalone
system, a home network or a office network, all face varying
levels of risks & Firewalls do a good job in mitigating these
risks. Tune the firewall for your requirements & security
levels and you have one reason less to worry.