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Which of the following operates on the HIGHEST layer of the OSI model, and is the most effective at blocking application attacks?

A) IDS
B) Router
C) WAF
D) Stateless firewall.

1 Answer

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Final answer:

The WAF (Web Application Firewall) operates on the highest layer of the OSI model and is the most effective at blocking application attacks.

Step-by-step explanation:

The correct answer is WAF (Web Application Firewall). A WAF operates on the highest layer of the OSI model, the Application layer. It is specifically designed to protect web applications from various types of attacks, including application-layer attacks. By analyzing and filtering HTTP traffic, a WAF can proactively block common application attacks such as SQL injection, cross-site scripting (XSS), and remote file inclusion.

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