A security administrator is tasked with protecting a highly sensitive database containing classified research data. The security policy requires that the server hosting this database be completely inaccessible from the company's internal network and the internet. Which of the following security measures should the administrator implement to meet this requirement?
An air-gap is a security measure where a system is physically isolated from unsecured networks, including internal networks and the internet. This physical separation prevents any network-based access, which is the most effective way to meet the requirement of complete inaccessibility. In contrast, a Virtual LAN (VLAN) and a software-defined network (SDN) provide logical network segmentation but do not physically isolate systems, leaving them connected to the same physical infrastructure. Split tunneling is a VPN feature that allows a user to access a public network (like the internet) and a private network simultaneously, which is the opposite of the required isolation and can increase security risks.
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