Designing Cisco Data Center Infrastructure (DCID) — Question 42

Which technology enables Layer 2 extension between remote data center sites?

Answer options

• A. FCIP
• B. GRE
• C. DMVPN
• D. OTV

Correct answer: D

Explanation

OTV (Overlay Transport Virtualization) is specifically designed for extending Layer 2 networks over long distances, making it the correct answer. FCIP is used for Fibre Channel over IP but does not provide Layer 2 extension. GRE is a tunneling protocol that operates at Layer 3, and DMVPN is designed for dynamic multipoint VPNs, which primarily focus on Layer 3 connectivity.