Answer (C) is correct . A proxy server maintains copies of web pages to be accessed by specified users. Outsiders are directed there, and more important information is not available from this access point.
Answer (A) is incorrect because A packet filtering system examines each incoming IP packet.
Answer (B) is incorrect because Kerberos is encryption and authentication software that uses DES encryption techniques.
Answer (D) is incorrect because An authentication system verifies a user’s identity and is often an application provided by a firewall system, but it is not a firewall system itself.
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