400-007 · Question #157
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 solution must provide a single 10G…
The correct answer is B. CWDM over dark fiber. For a 1-year 10G DCI requiring customer-controlled QoS without SP interaction, CWDM over dark fiber provides the lowest cost because CWDM optics are inexpensive and dark fiber gives the customer full equipment control.
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 solution must provide a single 10G connection between locations and be able to run its own varying QoS profiles without service provider interaction based on the migration stages. All connectivity methods are at 10 Gbps. Which transport technology costs the least if the connectivity is required for just one year?
Exhibit
Options
- AMPLS wires only
- BCWDM over dark fiber
- CDWDM over dark fiber
- DMetro Ethernet
How the community answered
(21 responses)- A14% (3)
- B48% (10)
- C29% (6)
- D10% (2)
Why each option
For a 1-year 10G DCI requiring customer-controlled QoS without SP interaction, CWDM over dark fiber provides the lowest cost because CWDM optics are inexpensive and dark fiber gives the customer full equipment control.
MPLS is a carrier-managed service with recurring SP fees and requires SP involvement to modify QoS profiles, violating the design requirement for independent QoS control.
Dark fiber leases the physical medium only, giving the customer complete control over all equipment and QoS profiles without SP interaction. CWDM transceivers are significantly cheaper than DWDM optics, and for a single 10G wavelength over a 1-year term, the total cost of dark fiber plus CWDM gear is lower than either DWDM equipment costs or recurring SP-managed service fees.
DWDM transceivers and amplification equipment carry a substantially higher capital cost than CWDM for a single 10G connection, making it more expensive even though dark fiber also enables SP-independent QoS.
Metro Ethernet is an SP-managed Layer 2 service with recurring monthly costs and QoS changes must be coordinated with the provider, making it both more expensive and less flexible for this requirement.
Concept tested: DCI transport technology cost and QoS independence comparison
Source: https://www.cisco.com/c/en/us/products/collateral/optical-networking/cwdm-sfp/product_data_sheet09186a008014299d.html
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