mercredi 27 novembre 2019

What is Firewall? Types of firewall and network firewall security Good or Bad?

What is Firewall? Types of firewall and network firewall security Good or Bad?

today we are going to understand different types of pearl volts and decide which five volts will best suit you as per your implementation environment so let's start by walls protect our computers from Internet hackers internet cycles can steal our bank details from our computers and can reduce our bank balance from thousands of dollars to zero within seconds so firewall is must in a computer or in a computer network. 

What is Firewall

there are three types of firewalls packet filtering firewalls application or proxy firewalls and
hybrid 5 volts before starting with 5 volt types you should know what are data packet when we want to download a file of size say 200 MB from internet then we will not receive the entire 200 MB data at once but we will receive small packet say 5 MB every second some of the part of this 5 MB packet is occupied with information like which computer is
sending the data which computer is receiving the data etcetera the remaining portion of this 5 MB packet contains the part of the actual data that we want to download so part of the
actual data plus some information together bounce a data packet for IP packets and this part of actual data is called payload now we can start with 5 Volt types starting with packet filtering firewall.

suppose I am downloading a file from Internet when the data packet arrives a packet filtering firewalls it only checks to the senders and the receivers IP address and the port number present in the data packet the rule written in early is called access control is are used for data packet verification if everything is OK then the data packet is allowed to pass through packet filtering firewalls and then to my computer but what is force number actually these are some digits written after IP address separated with a colon and are used for the successful data packet transfer the packet filtering firewall is already present in Internet rooters so they are the cheapest and the cutest way to implement the only limitation of packet filtering firewall is that internal checks the data portion that is payload of the data packets so a hacker could send some malicious data tagged in this payload section and packet filtering firewalls provides no security the second one is
application or proxy firewall let us understand it with an example suppose.

your mum asked you to buy a pens on the market you go to the show by the pens
come from back and give the pen to your mom here you have done the work that your mom wanted you to do without letting the shopkeeper knew who actually wanted that pen same is the case with application of rocks if eyeball replace the shopkeeper with Internet you're more with personal computer and yourself is proxy 5 volts like you did not let the show people knew that your mom was the one who actually wanted that friend similarly 55 volts do not let the Internet know which computer actually wants to visit the requested website that is proxy firewalls hide us from attackers in Internet let us understand
this whole process user enters the website in the web browser proxy firewalls receives the request and forwards that request to internet the web server in Internet
receives the request and response back to the proxy firewalls with the requested information the proxy.

firewalls receives the information and
forwards it to the original client for his viewing pleasure in this whole process web server thinks that proxy file is the one who wants to visit that is proxy
firewalls do not let the web server know the origin of the request so proxy firewalls protect us from the potential attackers in Internet by not disclosing all computers identity but I should say by not disclosing our computer's IP address.

since application firewalls also checks the payload of the receive digital package
so they are generally much slower than the packet filtering 5 volts third is I will 5 volts hybrid 5 volts combines packet filtering 5 volts and application firewalls in series enhance the security if they are connected in parallel then the security of the connection will be
reduced to the parameters defined by packet filtering firewalls that is Application Firewall will be of no use if the to 5 volts are connected in parallel for this reason hybrid 5 volt
use packet filtering and application firewalls in series as a result I built five walls provide slash security compared to packet filtering and application firewalls now which
firewalls will be best for us will depend on which implementation environment for example packet filtering firewalls will be best for low risk environments like fluoroscope
Application Firewall will be best for medium risk environment like universities and hybrid firewalls will be best for high risk environments like hospitals whose database contains important reports of the patient now you can choose a firewall as per your needs.

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