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

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

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dude same

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@@techvishnuyt OMG it’s a 4 year old comment when I was a college student!

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

[@TechTermsDG]

Thanks Sir.

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@@TechTermsDG " Remove the background music .. And talk little bit slow i have to play it on 0.75x to understand 😂😂😂..
Many Thanks bro.." this is educational material. Remove that nonsense noise, your video is global not for India consumption!

[@awake-dust4525]

@@timnoe19

[@awake-dust4525]

@@timnoe19 the voice is some standup comedy material but I hope they improve upon

[@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

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#😅

[@sydneybullodu973]

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

[@urmiladh2406]

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

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You explained this so well! Thank you!

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Good ... Proxy is defined in very simple way ... Thanks

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[@lavrijsen1]

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

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Excellent explanation! Thank you.

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covered my module in mins appreciated

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Perfectly executed ✌

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[@TechTermsDG]

Thanks Bishal Mukherjee

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Fantastic! Thank you.

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Excellent video......... with motion into right direction and at the target.

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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.

[@TechTermsDG]

Hi Tushar, You can watch OSI Model Explained which will give you an idea of the way of working of web applications.
Next video to be uploaded is on DNS. That will explain the same as per your need.

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amazing easy way of explaination with simple examples.....good work...

[@TechTermsDG]

Thanks AllInOne.

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mind blowing explanation................

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[@TechTermsDG]

Thanks

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[@TechTermsDG]

धन्यवाद (Thank you)

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What an explanation....