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Suppose that incoming packets are encrypted with a symmetric key that only the sender and receiver...

Suppose that incoming packets are encrypted with a symmetric key that only the sender and receiver know. Which type(s) of firewall will work with such packets and which will not? Why? Note: Some specific answer related to this question for these 3 firewalls: packet filtering, stateful packet filtering, and application proxy.

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For such packets which are encrypted with a symmetric key that only sender and receiver know, SuperMassive 9000 series firewalls are the most applicable. These firewalls are designed for deep packet inspection of SSL-encrypted data. These firewalls are designed to counter malicious programs with an intrusion protection system that specifically scans for evasion technology and behavior used by many programs.

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