300-320 Question #408: Real Exam Question with Answer & Explanation

The correct answer is A: OTV. Connecting two data centers while extending Layer 2 VLANs across a Layer 3 WAN (Data Center Interconnect, or DCI) requires technologies specifically designed for L2-over-L3 tunneling. OTV (Overlay Transport Virtualization) is a Cisco-proprietary DCI technology that encapsulates L

Question

Which technology you will use to connect 2 data centers and extend layer 2 VLANs? (Choose 2)

Options

AOTV
BVXLAN
CFabricPath
DIS-IS

Explanation

Connecting two data centers while extending Layer 2 VLANs across a Layer 3 WAN (Data Center Interconnect, or DCI) requires technologies specifically designed for L2-over-L3 tunneling. OTV (Overlay Transport Virtualization) is a Cisco-proprietary DCI technology that encapsulates Layer 2 Ethernet frames in IP/UDP, extending VLANs across any IP transport while providing MAC-route control and loop isolation - it was purpose-built for this exact scenario. VXLAN (Virtual Extensible LAN) is an IETF-standard encapsulation (RFC 7348) that tunnels Layer 2 frames inside UDP/IP packets, making it widely adopted for data center interconnect and overlay networks. FabricPath is Cisco's TRILL-based technology for multi-path Layer 2 switching within a single data center, not for interconnecting separate data centers. IS-IS is a Layer 3 link-state routing protocol and does not provide Layer 2 VLAN extension.

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