Poll Results
No votes. Be the first one to vote.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Firewalls are crucial for network security, and there are several types, each designed for specific security needs and network environments. The following are the main types of firewalls:
1. Packet Filtering Firewall: This is one of the most basic types of firewalls. It checks data packets (small chunks of data) against a set of filters (rules). Packets that pass these filters are allowed to enter the network, while those that don’t are blocked.
2. Stateful Inspection Firewall: Also known as dynamic packet filtering, this type tracks the state of active connections and makes decisions based on the context of the traffic and state of the connection, not just the packet headers.
3. Proxy Firewall (Application-level Gateway / Gateway Firewall): This firewall acts as an intermediary between end users and the internet, making requests on behalf of the users. This means it can provide more thorough inspection of the contents of the traffic at the application layer.
4. Circuit-level Gateway: Working at the session layer of the OSI model, this type of firewall monitors TCP handshakes and other session initiation protocols across the network to decide if the session should be established.
5. Next-Generation Firewall (NGFW): NGFWs include the capabilities of their predecessors but also offer functionality like encrypted traffic inspection, intrusion prevention systems (IPS), deep packet inspection (DPI), and more. They are designed to offer a deeper inspection of the packet payloads to identify and block sophisticated attacks
A. packet filtering firewall