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In short, it depends. If your web application firewall (WAF) is effective at stopping attacks from outside the network, then you likely do not need a firewall.

However, if your WAF is not effective or if you have concerns about the security of your network, then you should consider installing a firewall.

A firewall protects your computer and network from malicious attacks. It can be a physical device, such as a firewall router, or a software application, such as Windows Firewall.

A WAF can help protect your web applications from attacks that originate outside the network. By blocking malicious requests before they reach your web application, a WAF can help protect your web applications from attacks that Target vulnerabilities in your web application.

However, a WAF is not a replacement for a firewall. A WAF can only help protect your web applications from attacks that originate outside the network.

A firewall can also help protect your computer and network from other types of attacks, such as those that Target vulnerabilities in your computer or in the network itself.

Therefore, it is important to consider both a firewall and a WAF when protecting your web applications. A WAF can help protect your web applications from attacks that originate outside the network, while a firewall can help protect your computer and network from other types of attacks.