An administrator needs a remote VPN solution for corporate users. The existing network infrastructure has web-based services. The administrator needs to select the VPN that is the least complicated to

IPSec is embedded natively in enterprise network devices and modern operating systems, requiring no additional gateway software or separate client stack beyond what is already present in most corporate environments. Because it operates at Layer 3 and is supported by the broadest range of hardware and OS vendors, integrating it into an existing infrastructure involves the least additional deployment effort. L2TP, SSL, and PPTP each introduce additional layering, software requirements, or known weaknesses that add complexity by comparison.

L2TP lacks built-in encryption and must be combined with IPSec to be secure, adding a second protocol layer and increasing deployment complexity.

SSL VPN requires a dedicated gateway or web portal component and additional configuration for clientless or client-based access, adding overhead not present in a native IPSec deployment.

PPTP is deprecated due to serious known cryptographic vulnerabilities in its MS-CHAPv2 authentication, making it unsuitable for any modern corporate VPN deployment regardless of simplicity.