An engineer must ensure Layer 2 extension capabilities over any transport infrastructure. Which interconnective data center functionality satisfies this requirement?

The correct answer is B. OTV. OTV (Overlay Transport Virtualization) is a Cisco technology specifically designed to extend Layer 2 VLANs across any transport infrastructure - whether MPLS, IP, or even the public Internet. OTV encapsulates Layer 2 frames in an IP overlay, effectively routing MAC addresses…

Advanced Data Center Networks

Question

Options

APrivate line
BOTV
CVPLS
DEoMPLS

How the community answered

(17 responses)

B
94% (16)
D
6% (1)

Explanation

OTV (Overlay Transport Virtualization) is a Cisco technology specifically designed to extend Layer 2 VLANs across any transport infrastructure - whether MPLS, IP, or even the public Internet. OTV encapsulates Layer 2 frames in an IP overlay, effectively routing MAC addresses across Layer 3 boundaries without extending STP across sites, which makes it transport-agnostic and loop-safe. Option A (Private Line) is a physical dedicated circuit, not a software/protocol solution, and cannot span 'any transport.' Option C (VPLS - Virtual Private LAN Service) and Option D (EoMPLS - Ethernet over MPLS) also extend Layer 2, but both are MPLS-specific and therefore not transport-agnostic. OTV's key differentiator is its ability to work over any IP transport infrastructure.

Topics

#OTV#Layer 2 extension#data center interconnect#DCI transport

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