Which term is used for a device function that filters traffic between networks to enforce a security policy?

Which term is used for a device function that filters traffic between networks to enforce a security policy?

• A. Firewall
• B. Grayware
• C. Grey-Box Testing
• D. Frame Relay

Answer: (A)

A firewall is a device function used to filter traffic between networks to enforce a security policy. It sits at a network boundary and applies a set of rules to decide which packets or connections to permit or block, based on criteria like source and destination IPs, ports, and protocols. This control helps prevent unauthorized access and threats while allowing legitimate communication. The other terms don’t fit this role: grayware is unwanted software, Grey-Box Testing is a testing approach, and Frame Relay is a WAN networking technology, not a security filtering device.

A firewall is a device function used to filter traffic between networks to enforce a security policy. It sits at a network boundary and applies a set of rules to decide which packets or connections to permit or block, based on criteria like source and destination IPs, ports, and protocols. This control helps prevent unauthorized access and threats while allowing legitimate communication. The other terms don’t fit this role: grayware is unwanted software, Grey-Box Testing is a testing approach, and Frame Relay is a WAN networking technology, not a security filtering device.