350-401 Question 106
Single answerAn enterprise network architect is tasked with designing a scalable and isolated network environment to support multiple tenant environments on the same physical infrastructure. Which network virtualization technology enables the creation of separate logical networks over the same physical network infrastructure?
- A
VLANs
- B
VXLANs
- C
GRE Tunnels
- D
MPLS
Show answer and explanation
Correct answer: B
Explanation
VXLANs are specifically designed to address the limitations of VLANs by providing a scalable network virtualization solution. They allow the creation of logical Layer 2 networks over a Layer 3 infrastructure, supporting multi-tenancy and extending networks across data centers. This makes VXLANs the appropriate choice in this scenario.
- A. Incorrect.
VLANs provide Layer 2 network segmentation within a single broadcast domain, but they are limited in scalability and cannot easily span multiple data centers or networks.
- B. Correct.
VXLANs (Virtual Extensible LANs) enable the creation of isolated Layer 2 overlay networks over a shared Layer 3 infrastructure, providing enhanced scalability and multi-tenant support. This makes it the ideal solution for scalable network virtualization.
- C. Incorrect.
GRE (Generic Routing Encapsulation) tunnels provide a mechanism to encapsulate Layer 3 packets, but they are not specifically designed for creating isolated virtual networks at scale.
- D. Incorrect.
MPLS (Multiprotocol Label Switching) is a technology used for traffic engineering and forwarding, but it is not inherently designed for creating isolated virtual networks in the context of tenant environments.