A VPN creates a tunnel between a user or site and a VPN server. Traffic through the tunnel is encrypted, and the user is given access to internal resources such as file servers or admin tools that are not exposed to the public internet. Companies use VPNs for remote work, and technical teams use them to reach servers safely.
For protecting management access, the idea is simple: keep the admin interface reachable only from inside the private network, and require people to connect through the VPN first. The interface is no longer visible to the internet at large.
A VPN is itself an internet-facing service, so it needs care. VPN appliances and software have been a frequent target of exploitation, so they must be patched quickly. Strong sign-in, including multi-factor authentication, matters, and the VPN should grant access only to what each person needs, not the entire network.
Do not treat membership of the VPN as proof of trust. Log access and keep internal systems protected as well.