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[[What is a firewall? What are the types of firewalls?]] In the internet world hackers always check for the vulnerable devices that are connected to the network, they break the security and steal confidential information like banking details, passwords,etc… Firewall protects our information being stolen and it protects the network from cyber attacks. It acts as a checkpost for data check. We need a network for data transmission. Network can be of Local Area Network(LAN),Wide Area Network (WAN),Internet,etc.. The transmission of data occurs between two devices one is the source and the other is the receiver. Here comes the need of Firewall, it monitors the data packets that are being transferred and it checks whether the data is safe or not. It blocks unauthorized access that harms the data. It acts a protective shield and makes sure a secured network. It blocks the unwanted traffic that is trying to enter the network. Hope the above answer helps for what is Firewall (https://bit.ly/34jutOy) and now let us deep dive into types of firewalls. There are different types of Firewalls available in the market and we can use it accordingly based on the requirement. [[Packet Filtering Firewall:]] It operates inline junction, which comprises of switches and routers. During data transmission it checks various aspects of data such as whether the Ip address is allowed or not, port number, packet type and other aspects. During this checking process packets which are flagged as troublesome shall be filtered and shall not be moved further. Stateful Inspection Firewall : Stateful Inspection Firewall tracks whether the packet is a part of Transmission protocol or not. It checks the network protocols rather than the packet inspection. [[Circuit Level GateWay:]] Circuit level gateway monitors the Transmission Control Protocol (TCP) handshakes and also the protocol initiation messages throughout the network. It is established between the local and the remote host. [[Next Generation Firewall (NGFW) :]] The next generation firewall performs multitasking : it inspects the packets, detects and filters the malware and it acts as an antivirus. It is a combination of packet inspection and stateful inspection. [[Application Level gateway:]] It is a proxy and at times it is referred as Proxy Firewall. It is a combination of packet filter firewalls and circuit level gateway. They not only filter the data packets according to the services they are intended but also check HTTP string as well. [[How to choose a firewall?]] One should identify what is the sort of inspection that is required, either its packets verification or network protocols verification, or the combination of both or the protocol initiation messages. For more tech answers kindly visit https://www.quora.com/profile/Sirisha-133 Article Source: https://qr.ae/TSbcJk
