A firewall is a device or set of devices designed to permit or deny network transmissions based upon a set of rules and is frequently used to protect networks from unauthorized access while permitting legitimate communications to pass.
Many personal computer operating system include software-based firewalls to protect against threats from the public Internet. Many routers that pass data between networks contain firewall components and, conversely, many firewalls can perform basic routing functions.
Advantages of Hardware Firewalls
- Speed: Normally, the hardware firewalls are tailored for faster response times, and hence handle more traffic loads.
- Security: A firewall with its own operating system (proprietary) is less prone for attacks. This in turn reduces the security risk. In addition, hardware firewalls have enhanced security controls.
- No Interference: A box, that is separated from other network components can be managed better, and does not load or slowdown other applications. The box can be moved, shutdown, or reconfigured with minimal interference to the network.
- Cost. Normally, a dedicated hardware firewall costs more than a software firewall.
- Difficult to install, and upgrade.
- Takes up physical space, and involves wiring.
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