What exactly is a firewall? how does a firewall work? - 5 basic firewall types (2021)
IT k Funde・14 minutes read
Firewalls monitor and control network traffic for security, with hardware and software options available. It is recommended to use both types of firewalls for optimal protection, with different architectures and rule priorities for external and internal traffic.
Insights
- Hardware and software firewalls are essential for network security, with hardware options like standalone appliances or integrated routers and software firewalls providing operating system-level protection.
- Application proxy gateway stands out as the most sophisticated type of firewall, operating at the application layer to intelligently assess and manage packets, showcasing advanced security capabilities.
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Recent questions
What is the purpose of a firewall?
To act as a security guard for network traffic, allowing only legitimate traffic.
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Summary
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"Firewall: Hardware and Software for Network Security"
- Firewall acts as a security guard for network traffic, allowing only legitimate traffic.
- Two main categories of firewalls are hardware and software firewalls.
- It is recommended to use both hardware and software firewalls for enhanced security.
- Hardware firewalls can be standalone appliances or integrated into routers.
- Software firewalls provide a second layer of protection at the operating system level.
- Firewall architecture includes external and internal firewalls, with a demilitarized zone for less restricted servers.
- Rules in a firewall are set with lower priority for external traffic and higher priority for internal traffic.
- Five basic types of firewalls include packet filtering, stateful inspection, circuit level gateway, application proxy gateway, and firewall as a service.
- Application proxy gateway is the most advanced type, working at the application layer for intelligent packet assessment and management.
