Cisco
352-001 · Question #479
352-001 Question #479: Real Exam Question with Answer & Explanation
The correct answer is D: VPLS. VPLS is required when multiple data centers need multipoint VLAN extension so that VMs across sites can share the same subnet for replication.
Question
The Middle East-based cloud service provider, CSP, is planning to launch five data centers in Egypt, United Arab Emirates, Saudi Arabia, Qatar, and Turkey. CSP is looking for VLAN extension and DCIs between these five data centers to allow for software replication, where original and backup VMs must be on the same subnet. Which tunneling technology must they use?
Options
- AVPWS
- BL2TPv3
- CIPsec VPN
- DVPLS
Explanation
VPLS is required when multiple data centers need multipoint VLAN extension so that VMs across sites can share the same subnet for replication.
Common mistakes.
- A. VPWS (Virtual Private Wire Service) provides only point-to-point L2 pseudowire connections between exactly two sites and cannot support multipoint L2 connectivity across five data centers in a single broadcast domain.
- B. L2TPv3 creates point-to-point Layer 2 tunnels between two endpoints and does not natively support multipoint any-to-any L2 extension across five sites without complex hub-and-spoke or full-mesh manual pseudowire configurations.
- C. IPsec VPN operates at Layer 3 and encrypts IP traffic between sites but does not extend VLANs or L2 broadcast domains, so VMs at different sites cannot share the same subnet.
Concept tested. Multipoint L2 DCI technology for VM subnet extension
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