What is firewall? | Types of firewall | network firewall security | TechTerms

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Firewalls protect our computers from internet hackers. Internet hackers can steal our bank details from our computers and can reduce our bank balance from 1000s of dollars to 0 in seconds. So, firewall is must in a computer / computer network.

Starting with packet filtering firewall.

Suppose, I am downloading a file from internet. When the data-packet arrives a packet-filtering firewall, it only checks sender’s and receiver’s IP address and the port number.
If the everything is OK, then data packet is allowed to pass through packet-filtering firewall and then to my computer.
This checking process is done as per rules written in a list called access control list.

The only limitation (caveats) of packet filtering firewall is that it do not checks the data portion, i.e. Payload, of the data packet. So, a hacker could send some malicious data packed in this payload section.

The 2nd one is application / proxy firewall:
proxy firewall do not let the web server know which computer actually wants to visit the requested website, i.e. proxy firewall hides us from the attackers in internet.

Since, the application firewalls also check the data contents of the received data packet so they are generally much slower than packet-filtering firewalls.

3rd is Hybrid firewalls:
Hybrid firewalls combines packet filtering firewall and application firewall in series to enhance the security.
If they are connected in parallel then the security of the connection will be reduced to the parameters defined by the packet filtering firewall, i.e. application firewall will be of no use if the two firewalls are connected in parallel.
For this reason, hybrid firewalls use packet filtering and application firewall in series. #TechTerms

Must learn:

[BoomcoreIsLive]

Who watched this video, because its boring to read from book?

[Rambutharaju]

Now every time I think about proxy.... I will remember my mom ❤️❤️

[prahladjha]

within 5 mins,  i it covers a 1hr class's information.thanks

[TriMarko]

I had a 1 hour lecture on proxy firewalls in uni and didn't understand it. You explained them in 2 minutes and it makes complete sense. Thanks

[urmiladh]

Short, clear and easy to understand
Thank you, made my revision easy.
I learning more than in classes. Lol

[sayyedadeebhussain]

Jio mere laal ... kya mast samjhaya hai bhai

[sydneybullodu]

This video is so easy to understand about the firewalls types and their functionalities rather than going with the subject theory. Thanks TechTerms....

[AntuNeelesh]

Short, concise, lucid and up to the mark....great work mate !!

[snehakolisetty]

Never ever learnt something in such a fun way prior to watching this video....kudos to the team 🔥🎉

[ishitade]

This is very clearly explained in an effective manner, thanks!

[tharushikodithuwakku]

with in about 5 mins it covered a 2 hour uni lecture thank u

[pramodkadam]

It is simple & quick to understand. Unlike other slow videos which I have seen, you videos are fast & simple to understand without wasting too much of time. Your examples make learning quite simple.

[sachinkumarverma]

It's very simple and easy way to learn about firewall which you have provided. Thank you so

[adnanalghail]

I really get the benefit I was looking to know. Thank you.!

[lavrijsen]

i like the explanation with your mom. it makes things very clear. good job mate

[tusharvispute]

This is really nice video to understand the concept in short.

Pls add one more video which completely explain, how any website or web application works end to end on network.

[laash]

Your videos are horribly amazing u .. direct to the point .. super summarized .. full of useful information.. short time .. i swear to god u r one of a BILLION .. i love this channel like nothing

[Faisalinnayat]

i have shared this lecture to my all classmates and all of them including me understood this first time in a clear way. minathwar!

[AllInOne-xrlo]

amazing easy way of explaination with simple work...

Very interesting Thank You 😊 last minute exam revision