This is when the VPN technology uses a gateway device to connect the entire network in one location to a network in another location. The majority of site-to-site VPNs that connect over the internet use IPsec. IPsec-based encryption protocols are often considered by VPN specialists to be less secure against modern surveillance. Rather than using the public internet, it is also normal to use multiprotocol label switching clouds as the main transport for site-to-site VPNs. VPNs are often defined between specific computers, and in most cases, they are servers in separate data centers. However, new hybrid-access situations have now transformed the VPN gateway in the cloud, typically with a secure link from the cloud service provider into the internal network.