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400-007 · Question #155
400-007 Question #155: Real Exam Question with Answer & Explanation
The correct answer is D: Metro Ethernet. For a time-bound 20-30 month DCI migration project, Metro Ethernet delivers the best ROI because it is offered as a managed service with flexible contract terms and no capital expenditure on optical transport infrastructure.
Question
Refer to the table. A customer investigates connectivity options for a DCI between two production data centers to aid a large-scale migration project. The migration is estimated to take 20 months to complete but might extend an additional 10 months if issues arise. All connectivity options meet the requirements to migrate workloads. Which transport technology provides the best ROI based on cost and flexibility?
Exhibit
Options
- ACWDM over dark fiber
- BMPLS
- CDWDM over dark fiber
- DMetro Ethernet
Explanation
For a time-bound 20-30 month DCI migration project, Metro Ethernet delivers the best ROI because it is offered as a managed service with flexible contract terms and no capital expenditure on optical transport infrastructure.
Common mistakes.
- A. CWDM over dark fiber requires significant capital expenditure on both dark fiber lease agreements and CWDM transponder equipment, which is not cost-effective for a temporary project.
- B. MPLS services typically involve longer-term provider contracts and provisioning lead times that reduce flexibility for a fixed-duration migration project.
- C. DWDM over dark fiber carries the highest capital and operational costs of all options due to dense optical equipment requirements, yielding poor ROI for a temporary DCI use case.
Concept tested. DCI transport technology selection for ROI and flexibility
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