You are designing a network solution to connect a primary data center to a disaster recovery site. The applications hosted on the site will be mainly web and email servers that are provided through…

Point-to-point GRE tunnels provide Layer 3 IP connectivity between the primary data center and the DR site, which is sufficient for web and email servers that do not require L2 adjacency or shared subnets. GRE is lightweight, widely supported, and scales incrementally - when a third data center is added in six months, additional GRE tunnels can be provisioned without redesigning the underlying architecture. This avoids the complexity of L2 VPN services that are unnecessary for this workload type.

L2TPv3 is a Layer 2 pseudowire tunneling protocol used for L2 VPN extension, which introduces unnecessary complexity for a DR scenario where only Layer 3 IP routing is required.

VPWS (Virtual Private Wire Service) is a point-to-point L2 VPN service that extends Layer 2 across sites - this overhead is unwarranted when the web and email servers only need L3 routed connectivity.

VPLS (Virtual Private LAN Service) is a multipoint L2 VPN technology designed for multiple sites requiring the same broadcast domain, which is excessive for a two-site DR scenario with applications that only need L3 reachability.