What is the maximum number of site-to-site VPNs allowed by this configuration?

In Cisco's configurations, the maximum number of site-to-site Virtual Private Networks (VPNs) that can be supported is determined by the capabilities of the device and the specific software package it is running. In many cases, devices like Cisco routers have different licensing options that dictate the number of concurrent VPN sessions they can handle.

In the context of this question, if the configuration allows for 15 site-to-site VPNs, this indicates that the hardware or software being referenced is designed to support that specific number. This means that in a real-world deployment, you would be able to create and maintain up to 15 tunnels to connect multiple sites securely through the Internet while ensuring that the necessary resources for encryption and decryption can be adequately managed within the given limits.

Thus, the answer reflects the specific capabilities of the configuration in question.