The do exist, and are commonly more powerful in

The need of Network Security is rising at an indistinguishable pace
from that of expanded Internet use. System Security keeps from ill-conceived
permission, hacking and legitimate information transportation. System Security
comprise of arrangements and strategies embraced by a network administrator to
block and  unauthorized access,
alterations, perversion, declination of a PC system and system available
assets. System Security is accomplished by Firewall. A firewall is an hardware
device or software system or gathering of systems intended to allow or deny
organize transmission based on set of security principles and directions to
authorize control between two systems to ensure “inside” system from
“outside” system.

A hardware firewall is like a router, but with many more features. To
be sure many routers have hardware firewall built in. hardware firewall protects
local network, Hardware firewall is generally part of TCP/IP switch. These
firewalls work by packet filtering, so they can’t protect everything. In any
case, they can’t be effectively crushed by malware, some of which specifically
assaults programming firewalls. Since they are not installed on any PC, they don’t
slow down the PCs by taking up system assets. Many system routers have built in
firewalls. This reduces the cost by eliminating the need to purchase a
different firewall. Nonetheless, standalone hardware firewalls do exist, and
are commonly more powerful in their security than those which are interior to
the router.

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Software firewall is a PC with firewall programmed application which
gives assurance from gatecrashers, which may likewise give web connectivity
between Private LAN and Public Network/Internet. Software firewalls can be
utilized to keep certain clients or devices from getting to devices on your
system, not only devices on the web. Software firewalls are much easier to
configure than hardware ones and can be individually configured by the user.
With a couple of mouse clicks, the level of firewall protection can be altered
to the individual user inclinations and requirements. The most abnormal amount
of protection would incorporate blocking all cookies and JavaScript; in any
case, it ought to be noticed that this will keep some site pages from working.
With a software firewall, the user can characterize which programs have
authorization to get to the Internet. At the point when set up in this way,
whatever other programs which endeavor to get to the Internet, for example,
malware, are consequently blocked. Since these firewalls live in the PC, they
are very versatile, going wherever the PC goes.

 

Examples:

Some operating systems have built-in software firewalls. An example of a software firewall is the one
built into most Windows operating systems.  You should leave the Windows
firewall turned on unless you replace it with third-party firewall
software.  Other software firewalls are supplied by outside vendors, or
may be part of a commercial security suite. A software firewall must be
properly configured in order to be effective.  

VPN stands for Virtual Private Network. It operates similar to a proxy
firewall. So, in a sense we can refer to a VPN as a type of firewall. Netgate pfSense Security Gateway Appliances
and Barracuda Firewall are examples of hardware firewalls.

References:

·       
Kahate,A.
Cryptography and Network Security. ISBN-13: 978-0-07-064823-4, ISBN-10:0-07-64823-9,
McGraw Hill Higher Education.

·       
Warade,
S. J., Tijare, P. A., & Sawalkar, S. N. (2014). Data Security in Local
Network using Distributed Firewall: A Review. International Journal of Computer
Applications (0975-8887), National Conference on Emerging Trends in Computer
Technology  (NCETCT-2014), pp: 19-21.

·       
 Sahare, S., Joshi, M., & Gehlot, M.
(2012). A Survey Paper: Data Security in Local Networks Using Distributed
Firewalls. International Journal on Computer Science and Engineering (IJCSE), Vol.
4 No. 9 Sep 2012, ISSN: 0975-3397, pp: 1617-1622.