350-401 Question 108
Single answerA network engineer is tasked with implementing a virtualized network environment to allow multiple customers to securely share the same physical infrastructure. The solution must ensure isolation between customers while using a single physical network. Which network virtualization technology is the most appropriate for this scenario?
- A
Virtual LANs (VLANs)
- B
Virtual Extensible LANs (VXLANs)
- C
Cisco ACI (Application Centric Infrastructure)
- D
Virtual Port Channels (vPC)
Show answer and explanation
Correct answer: B
Explanation
Virtual Extensible LANs (VXLANs) are a network virtualization technology that enables scalable and isolated Layer 2 networks over a shared Layer 3 infrastructure. They are well-suited for multi-tenant environments where multiple customers need secure isolation while sharing the same physical network infrastructure. VLANs lack the scalability required for such environments, and other options like Cisco ACI and vPCs address different networking challenges.
- A. Incorrect.
VLANs provide basic segmentation within a network but are limited in scalability, especially in large or multi-tenant environments. This makes them less suitable for isolating multiple customers sharing the same physical infrastructure.
- B. Correct.
VXLANs are designed to address scalability and isolation challenges in large virtualized environments, making them ideal for securely isolating multiple customers on the same physical network.
- C. Incorrect.
Cisco ACI is a policy-based SDN solution that facilitates application-centric networking, but it is more focused on automation and policy enforcement than on providing tenant isolation in multi-tenant environments.
- D. Incorrect.
vPCs allow link aggregation across switches for redundancy and load balancing but do not provide tenant isolation or network virtualization capabilities.