You are designing a solution to connect a primary data center to a disaster recovery site, The hosted applications will be web and email servers that are provided through a virtualized environment. Wh

Question

Options

• AL2TPV3.
• BVPWS.
• CPoint-To-Point GRE tunnels.
• DVPLS.

• A
  78% (28)
• B
  3% (1)
• C
  14% (5)
• D
  6% (2)

Explanation

L2TPv3 is the right choice because it extends Layer 2 connectivity between the two sites over an IP network, allowing virtualized workloads (web and email servers) to failover to the DR site without requiring IP address changes - a critical requirement for seamless VM mobility in disaster recovery scenarios.

VPWS (B) also provides point-to-point Layer 2 pseudo-wire connectivity, but it operates over MPLS infrastructure, making it a service provider construct rather than a direct data center interconnect technology - it doesn't fit a self-managed DC-to-DR design as cleanly.

Point-to-Point GRE (C) is a Layer 3 tunnel, meaning VMs migrated to the DR site would land in a different Layer 3 domain and need new IP addresses, breaking the transparent failover that virtualized environments require.

VPLS (D) is a multipoint Layer 2 VPN technology designed to connect many sites as a virtual LAN - using it for just two sites (primary + DR) is overengineered and unnecessarily complex.

Memory tip: "L2TPv3 = same LAN, different location." If your VMs need to cross a WAN but still act like they never moved, L2TPv3 stretches that Layer 2 bridge - making it the go-to for DC-to-DR virtualized environments.

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