Theresa has used an air gap as her segmentation solution. An air gap refers to a security measure where a secure network is physically isolated from untrusted networks, preventing any direct connections or transmissions between the two. This is commonly used to protect critical systems from external threats.
- A Faraday cage is more about protecting against electromagnetic interference rather than network segmentation.
- A VLAN (Virtual Local Area Network) is a logical separation that operates within the same physical network infrastructure but does not provide physical isolation.
- A jumpbox (or jump server) is a server used to manage devices in a separate network but does not create an isolated network by itself.
So, the correct answer is an air gap.