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  1. Home
  2. Cisco Certification
  3. 400-007 Exam
  4. Cisco.400-007.v2025-12-06.q401 Dumps
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Question 51

Various teams in different organizations within an enterprise are preparing low-level design documents using a Waterfall project model. Input from relevant stakeholders was captured at the start of the project, and the scope has been defined. What impact will it have if stakeholders ask for changes before documentation is complete?

Correct Answer: C
* C (Significant effort and time): In a Waterfall model, changes introduced after the design phase require rework of multiple design documents, validations, and downstream impacts on implementation and testing. This leads to significant delays and resource consumption compared to more flexible models like Agile.
Other options explained:
* A: Creativity is not the primary impact.
* B: Rework is true but doesn't fully capture the scope of additional effort.
* D: Waterfall does not provide inherent flexibility to absorb late changes.
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Question 52

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?

Correct Answer: C
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Let's calculate total 1-year cost for each option using the provided table:
* DWDM over dark fiber:
* CAPEX = $250,000
* OPEX (1 year) = $100,000
* Installation fee = $30,000
* Total = $250,000 + $100,000 + $30,000 = $380,000
* CWDM over dark fiber:
* CAPEX = $150,000
* OPEX (1 year) = $100,000
* Installation fee = $25,000
* Total = $150,000 + $100,000 + $25,000 = $275,000
* MPLS wires only:
* CAPEX = $50,000
* OPEX (1 year) = $80,000
* Installation fee = $5,000
* Total = $50,000 + $80,000 + $5,000 = $135,000
* BUT: MPLS does not allow customer-controlled QoS policies as stated in the requirement (cannot run its own varying QoS profiles without SP interaction). Therefore disqualified.
* Metro Ethernet:
* CAPEX = $45,000
* OPEX (1 year) = $100,000
* Installation fee = $5,000
* Total = $45,000 + $100,000 + $5,000 = $150,000
* BUT: Metro Ethernet is also typically a service provider-managed solution where customer-controlled QoS is usually limited depending on SP capabilities. May not fully meet the requirement.
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The key technical requirement:
"Be able to run its own varying QoS profiles without service provider interaction." This clearly favors dark fiber solutions (CWDM and DWDM), as these give full Layer 1 control to the customer, allowing complete freedom in managing QoS, traffic engineering, and prioritization internally.
Among the two dark fiber options, CWDM over dark fiber is the most cost-effective choice for one year at
$275,000.
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Therefore, final correct answer:
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Question 53

A financial company requires that a custom TCP-based stock-trading application be prioritized over all other traffic for the business due to the associated revenue. The company also requires that VoIP be prioritized for manual trades. Which directive should be followed when a QoS strategy is developed for the business?

Correct Answer: C
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Question 54

Company XYZ has two offices connected to each other over unequal redundant paths and they are running OSPF as the routing protocol An external network architect recommends BFD for OSPF Which effect would BFD have in the case of a link failure?

Correct Answer: D
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Question 55

Which service abstracts away the management of the operating system, middleware, and runtime?

Correct Answer: B
IaaS, PaaS, and SaaS each offer a progressive layer of abstraction after that. IaaS abstracts away the physical compute, network, storage, and the technology needed to virtualize those resources. PaaS goes a step further and abstracts away the management of the operating system, middleware, and runtime.
https://www.ibm.com/topics/iaas#:~:text=IaaS%20abstracts%20away%20the%20physical,system%2C%20middleware%2C%20and%20runtime.
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