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Which of the following statements is true regarding ALL firewalls?
A firewall is only aware of DNS and SMTP services.
A firewall can act as an application gateway.
A firewall is a Layer 4 application or device; hence, it is not aware of specific applications.
none of these
What type of firewall are you asking about? This is a vague question. *** Needs clarification *** Layer 7 firewalls can act as application gateways, stateful firewalls without application awareness reside at Layer 4. EDIT: This questions specifies ALL firewalls which inherently means either all or none of these would be more applicable.
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