350-401 · Question #472
What are two characteristics of VXLAN? (Choose two)
The correct answer is A. It uses VTEPs to encapsulate and decapsulate frames. C. It allows for up to 16 million VXLAN segments. VXLAN is a network virtualization technology that uses VXLAN Tunnel Endpoints (VTEPs) to encapsulate and decapsulate frames, and it supports a large number of logical network segments, up to 16 million.
Question
What are two characteristics of VXLAN? (Choose two)
Options
- AIt uses VTEPs to encapsulate and decapsulate frames.
- BIt has a 12-bit network identifier
- CIt allows for up to 16 million VXLAN segments
- DIt lacks support for host mobility
- EIt extends Layer 2 and Layer 3 overlay networks over a Layer 2 underlay.
How the community answered
(44 responses)- A86% (38)
- B2% (1)
- D2% (1)
- E9% (4)
Why each option
VXLAN is a network virtualization technology that uses VXLAN Tunnel Endpoints (VTEPs) to encapsulate and decapsulate frames, and it supports a large number of logical network segments, up to 16 million.
VXLAN uses VXLAN Tunnel Endpoints (VTEPs) to encapsulate Layer 2 Ethernet frames into UDP packets for transmission across the IP underlay network and then decapsulate them upon arrival at the destination VTEP, effectively creating an overlay network.
VXLAN uses a 24-bit VNI (VXLAN Network Identifier), not a 12-bit identifier; a 12-bit identifier is characteristic of traditional VLANs, which offer only 4094 segments.
VXLAN utilizes a 24-bit VXLAN Network Identifier (VNI), which allows for up to 2^24 unique VXLAN segments. This translates to approximately 16 million logical network segments, far exceeding the limit of traditional VLANs.
VXLAN is specifically designed to facilitate host mobility by extending Layer 2 networks across data centers, allowing virtual machines to move across physical hosts without changing their IP addresses.
VXLAN extends Layer 2 overlay networks over a Layer 3 underlay; it does not inherently extend Layer 3 overlay networks, which typically requires a separate routing function or Layer 3 gateway.
Concept tested: VXLAN characteristics and components
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-734563.html
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