350-401 · Question #346
Which solution do laaS service providers use to extend a Layer 2 segment across a Layer 3 network?
The correct answer is C. VXLAN. VXLAN is a widely adopted network virtualization encapsulation protocol used by IaaS providers to extend Layer 2 networks over a Layer 3 infrastructure.
Question
Options
- AVLAN
- BVTEP
- CVXLAN
- DVRF
How the community answered
(64 responses)- A3% (2)
- B2% (1)
- C91% (58)
- D5% (3)
Why each option
VXLAN is a widely adopted network virtualization encapsulation protocol used by IaaS providers to extend Layer 2 networks over a Layer 3 infrastructure.
VLANs are used for segmenting broadcast domains within a single Layer 2 network and cannot natively extend a Layer 2 segment across a Layer 3 network.
A VTEP (VXLAN Tunnel Endpoint) is a network device or software function that encapsulates and de-encapsulates VXLAN packets; it is a component of VXLAN, not the solution itself.
VXLAN (Virtual eXtensible LAN) encapsulates Layer 2 Ethernet frames within Layer 3 UDP packets, allowing Layer 2 segments to be stretched across a Layer 3 IP network. This enables multi-tenant environments and large-scale virtualized data centers to overcome VLAN limitations and scale network virtualization.
VRF (Virtual Routing and Forwarding) creates independent routing tables for Layer 3 network segmentation, isolating routing instances rather than extending Layer 2 segments.
Concept tested: Network virtualization, VXLAN, Layer 2 over Layer 3
Source: https://learn.microsoft.com/en-us/windows-server/networking/sdn/technologies/vxlan/vxlan-overview
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