Application proxy firewalls can always examine application layer content.

• A. TRUE
• B. FALSE
• C. Often
• D. Only when configured

Answer: (A)

Application proxy firewalls inspect application-layer data by design. They sit between the client and the server and terminate the client’s connection, then re-establish a separate connection to the server, allowing them to decode the application protocol in use. This means they can read HTTP methods, URLs, headers, and payloads (and similarly inspect commands and data for other protocols like SMTP or FTP) to enforce security policies, block malicious content, and validate inputs before it ever reaches the destination service.

In practice, this level of inspection depends on visibility into the content. If traffic is unencrypted or the proxy is configured to terminate TLS and decrypt the traffic, the application-layer content is accessible for inspection. If traffic remains end-to-end encrypted with no TLS termination, the payload isn’t readable by the proxy. Still, the capability is inherent to how these devices operate, which is why they’re described as able to examine application-layer content.