Please define a firewall and describe how it is used.

"A firewall is a technology that creates a barrier to the network which only authorized users can penetrate. Firewalls can be configured with various access levels and definitions of the types of information allowed to access the network. They can also monitor network traffic and provide information about how the network is being used."

This technical question addresses a single technology used in the field of cybersecurity. It asks you to first define the concept of a firewall and then describe how it is used. This is the typical format of most of the technical questions you will be asked during an interview. When responding to technical questions, keep your answers brief and to the point. The interviewer will ask you a follow-up question if they need additional information.