A ________ firewall handling all traditional firewall functions (SPI, ACLs, etc.) as well as additional security functions such as antivirus filtering, spam filtering, application proxy filtering, and so forth.

• A. Unified Threat Management
• B. Stateful Packet Inspection
• C. Static Packet Inspection
• D. None of the above

Answer: (A)

Unified Threat Management is the type of firewall described. It combines traditional firewall duties—like SPI (tracking the state of connections) and ACLs (access control lists)—with extra security services such as antivirus filtering, spam filtering, and application proxy filtering, all in one device. This all-in-one approach provides broader protection while simplifying management, which is exactly what the description calls for.

Stateful Packet Inspection focuses on knowing the state of connections to allow legitimate traffic, but it doesn't inherently include antivirus, spam, or application-proxy features. Static Packet Inspection lacks the dynamic state awareness and typically does not bundle the extra security services. None of the above would be incorrect because there is a term that fits the scenario.