John is working as a network administrator in an MNC company.

A hub-and-spoke topology is a type of VPN topology that connects multiple remote offices to a central hub, usually the corporate head office, through VPN tunnels. The hub acts as a gateway for the remote offices to access the corporate network resources. However, the remote offices cannot communicate with each other directly, and have to go through the hub. This topology reduces the number of VPN tunnels required, but also increases the load and latency on the hub. In the scenario, John configured a central hub at the corporate head office, through which all branch offices can communicate, but deniedcommunication between the remote offices.Therefore, the type of VPN topology implemented by John is hub-and-spoke12.References:Network Defense Essentials - EC-Council Learning,Network Design Scenario #3: Remote Access VPN Design - Network Defense Blog