[CISCO] 400-007 - Design Expert (CCDE) Exam Dumps & Study Guide

Free [CISCO] 400-007 - Design Expert (CCDE) Practice Questions Preview

• Question 1

  Company XYZ is planning to deploy primary and secondary (disaster recovery) data center sites. Each of these sites will have redundant SAN fabrics and data protection is expected between the data center sites. The sites are 100 miles (160 km) apart and target RPO/RTO are 3 hrs and 24 hrs, respectively. Which two considerations must Company XYZ bear in mind when deploying replication in their scenario? (Choose two.)
  

  • A. Target RPO/RTO requirements cannot be met due to the one-way delay introduced by the distance between sites.
  • B. VSANs must be extended from the primary to the secondary site to improve performance and availability.
  • C. VSANs must be routed between sites to isolate fault domains and increase overall availability.
  • D. Synchronous data replication must be used to meet the business requirements.
  • E. Asynchronous data replication should be used in this scenario to avoid performance impact in the primary site.

  Correct Answer: CE

  Explanation:

  The AI agrees with the suggested answer of CE. Here's a breakdown of why:

  • Choice C: VSANs must be routed between sites to isolate fault domains and increase overall availability.
    This is a crucial consideration for disaster recovery setups. Routing VSANs (Virtual SANs) between sites ensures that network failures or other issues in one site do not automatically propagate to the other. This isolation enhances overall availability. Each site operating as a separate fault domain limits the blast radius of potential problems.
    
  • Choice E: Asynchronous data replication should be used in this scenario to avoid performance impact in the primary site.
    Given the 100-mile distance between the data centers, synchronous replication could introduce significant latency, negatively impacting primary site performance. Asynchronous replication is more suitable for longer distances because it doesn't require immediate acknowledgement of data writes, which allows primary operations to continue with minimal delay. Considering the RPO target of 3 hours, asynchronous replication is acceptable.
    

  Here's why the other options are less suitable:

  • Choice A: Target RPO/RTO requirements cannot be met due to the one-way delay introduced by the distance between sites.
    While distance is a factor, an RPO of 3 hours is achievable with proper asynchronous replication configuration. The statement that it *cannot* be met is too definitive.
    
  • Choice B: VSANs must be extended from the primary to the secondary site to improve performance and availability.
    Extending VSANs across sites, while possible, creates a single point of failure and reduces fault isolation. It is generally not recommended for disaster recovery scenarios where independent operation is desired. It does not align well with the need for isolating fault domains.
    
  • Choice D: Synchronous data replication must be used to meet the business requirements.
    Synchronous replication over 100 miles would likely introduce unacceptable latency, severely impacting performance at the primary site. The RPO target of 3 hours does not necessitate synchronous replication.
    

  In summary, routing VSANs for fault isolation (C) and using asynchronous replication to mitigate performance impact over distance (E) are the most appropriate considerations in this scenario.

  
  

• Question 2

  An architect receives a business requirement from a CTO that states the RTO and RPO for a new system should be as close as possible to zero. Which replication method and data center technology should be used?
  

  • A. synchronous replication over geographically dispersed dual data centers via MPLS
  • B. synchronous replication over dual data centers via Metro Ethernet
  • C. asynchronous replication over geographically dispersed dual data centers via CWDM
  • D. asynchronous replication over dual data centers via DWDM

  Correct Answer: B

  Explanation:

  The AI recommends answer B.
  
  The suggested answer is B (synchronous replication over dual data centers via Metro Ethernet).
  
  Reasoning:
  The question specifies a requirement for Recovery Time Objective (RTO) and Recovery Point Objective (RPO) to be as close to zero as possible. This necessitates synchronous replication, as it provides real-time data mirroring and minimal data loss.
  Metro Ethernet is a suitable technology for connecting dual data centers because it offers high bandwidth and low latency, which are crucial for synchronous replication over a metropolitan area network (MAN). This ensures minimal delay in data transfer, thus meeting the near-zero RTO/RPO requirement.
  
  Reasons for not choosing the other answers:
  

  • A: Synchronous replication over geographically dispersed dual data centers via MPLS: MPLS introduces added overhead and latency due to its packet-switched nature and routing complexity, making it less ideal for near-zero RTO/RPO compared to Metro Ethernet. Furthermore, geographically dispersed data centers increase latency, posing challenges for synchronous replication.
  • C: Asynchronous replication over geographically dispersed dual data centers via CWDM: Asynchronous replication inherently involves data loss (data lag), and therefore does not meet the near-zero RTO/RPO requirement. Geographically dispersed data centers further exacerbate latency issues.
  • D: Asynchronous replication over dual data centers via DWDM: Similar to option C, asynchronous replication does not meet the RTO/RPO requirement. While DWDM provides high bandwidth, the asynchronous nature of the replication makes it unsuitable for the stated objective.

  In summary, synchronous replication combined with the low latency and high bandwidth of Metro Ethernet provides the best solution for achieving RTO and RPO as close to zero as possible.

  Supporting Citations:

  • Metro Ethernet Forum, https://www.mef.net/
  • MPLS, https://www.techtarget.com/searchnetworking/definition/MPLS
  • CWDM/DWDM, https://www.fiber-optic-solutions.com/cwdm-vs-dwdm.html

• Question 3

  What are two primary design constraints when a robust infrastructure solution is created? (Choose two.)
  

  • A. component availability
  • B. monitoring capabilities
  • C. project time frame
  • D. staff experience
  • E. total cost

  Correct Answer: CE

  Explanation:

  The suggested answer is CE.
  The AI agrees with the suggested answer.
  Reasoning:
  When creating a robust infrastructure solution, two primary design constraints are the project timeframe and the total cost. These constraints are fundamental because they directly influence the feasibility and viability of the project. Timeframe dictates how quickly the solution needs to be implemented, affecting resource allocation and technology choices. Total cost, on the other hand, determines the budget available for hardware, software, personnel, and ongoing maintenance. Together, they define the boundaries within which the infrastructure solution must be designed and implemented.
  Considerations include:

  • Project Time Frame: The deadline for completing the infrastructure solution is a critical constraint. It affects the choice of technologies, the development methodology, and the resources required. A shorter timeframe may necessitate simpler solutions or the use of pre-built components, while a longer timeframe allows for more complex and customized designs.
  • Total Cost: The budget allocated to the project limits the scope and features of the infrastructure solution. It influences the selection of hardware and software, the level of redundancy and scalability, and the staffing model. A lower budget may require compromises on performance or features, while a higher budget allows for more robust and sophisticated solutions.

  
  Reasons for not choosing the other options:

  • A. Component availability: While important, component availability is generally a consideration *within* the cost and time constraints, rather than a primary constraint *driving* the overall design.
  • B. Monitoring capabilities: Similar to component availability, monitoring capabilities are a design consideration, but not a primary constraint. They are part of ensuring the solution's robustness, but the project's time and cost are more fundamental.
  • D. Staff experience: Staff experience influences *how* the solution is implemented within the given constraints but is not a primary constraint itself. While the skills of the staff are undoubtedly important for successful implementation, they don't usually set the boundaries for initial design as directly as time and cost.

  Citations:

  • Project Management Constraints: https://www.smartsheet.com/content/project-management-constraints
  • Understanding the Iron Triangle of Project Management: https://www.teamgantt.com/blog/understanding-the-iron-triangle-of-project-management

• Question 4

  Which network management framework can be used to develop a network architecture that contains business requirements analysis, gap analysis, and network diagrams as artifacts to be used for design and implementation later?
  

  • A. FCAPS
  • B. Cobit
  • C. TOGAF
  • D. ITIL

  Correct Answer: C

  Explanation:

  The AI agrees with the suggested answer of C (TOGAF).
  
  Reasoning: TOGAF (The Open Group Architecture Framework) is a comprehensive framework for enterprise architecture. It provides a structured approach to designing, planning, implementing, and governing an enterprise's IT architecture. TOGAF is specifically designed to align IT with business goals and includes phases for business requirements analysis, gap analysis, and the creation of architecture artifacts like network diagrams. The Architecture Development Method (ADM) within TOGAF guides architects through the process of developing an enterprise architecture that supports the business strategy. This is documented in the TOGAF standard.
  
  Reasons for not choosing the other answers:

  • A (FCAPS): FCAPS (Fault, Configuration, Accounting, Performance, Security) is an ISO network management model. It is primarily focused on network management functions rather than developing a comprehensive network architecture aligned with business requirements. It does not offer the same level of detail for business requirements analysis and gap analysis as TOGAF.
  • B (COBIT): COBIT (Control Objectives for Information and related Technology) is a framework for IT governance and management. While COBIT helps ensure that IT aligns with business goals, it is more focused on control and governance aspects rather than providing a detailed methodology for designing a network architecture.
  • D (ITIL): ITIL (Information Technology Infrastructure Library) is a set of best practices for IT service management. It focuses on the delivery and support of IT services, rather than the design and implementation of network architectures to meet business requirements.

  In summary, TOGAF is the most suitable framework for developing a network architecture that integrates business requirements analysis, gap analysis, and network diagrams for subsequent design and implementation.

  Citations:

  • TOGAF, https://www.opengroup.org/architecture/togaf
  • FCAPS, https://www.tutorialspoint.com/network-management/network_management_fcap_model.htm
  • COBIT, https://www.isaca.org/cobit/
  • ITIL, https://www.axelos.com/best-practice-solutions/itil

• Question 5

  Which two types of planning approaches are used to develop business-driven network designs and to facilitate the design decisions? (Choose two.)
  

  • A. strategic planning approach
  • B. business optimization approach
  • C. tactical planning approach
  • D. modular approach
  • E. cost optimization approach

  Correct Answer: AC

  Explanation:

  The suggested answer is AC. The AI agrees with the suggested answer.
  Reasoning:
  Based on the question and available information, a business-driven network design should align with both strategic and tactical considerations. Strategic planning defines the overall goals and direction, while tactical planning focuses on the specific actions and resources needed to achieve those goals.
  * Strategic planning involves defining the company's mission, vision, and values, and setting long-term goals and objectives. This type of planning approach can certainly be used to develop business-driven network designs and to facilitate the design decisions.
  * Tactical planning translates the strategic goals into specific, actionable steps. It involves developing detailed plans for each functional area of the business, such as marketing, sales, operations, and finance. Therefore, this type of planning approach can also be used to develop business-driven network designs and to facilitate the design decisions.
  Reasons for not choosing the other options:
  * *Business optimization approach* isn't as universally recognized a term within network design methodologies.
  * *Modular approach* is a design methodology, not a planning approach.
  * *Cost optimization approach* while important, is usually a subset of either strategic or tactical planning rather than a standalone planning approach.
  

  • Strategic planning - Wikipedia, https://en.wikipedia.org/wiki/Strategic_planning
  • Tactical planning - Wikipedia, https://en.wikipedia.org/wiki/Tactical_planning

• Question 6

  
  Refer to the exhibit. ACME Mining has four data centers in Santiago, Cape Town, Mumbai, and Beijing, full-mesh connected via a 400 Mb/s EVP-LAN. They want to deploy a new mission-critical application with these requirements:
  * cluster heartbeat 2 MB/s continuous (250 KB/s)
  * cluster heartbeat one-way maximum latency 100 ms
  These are the current ping tests results between the four data centers:
  
  Which hosting data center pair can host the new application?
  

  • A. Mumbai and Beijing
  • B. Cape Town and Mumbai
  • C. Cape Town and Beijing
  • D. Santiago and Mumbai
  • E. Santiago and Beijing
  • F. Santiago and Cape Town

  Correct Answer: B

  Explanation:

  The suggested answer is B, Cape Town and Mumbai.
  The AI agrees with the suggested answer.
  Here's a breakdown of the reasoning:

  • The application requirements are a cluster heartbeat of 2 MB/s and a one-way maximum latency of 100 ms.
  • The ping test results show the round-trip time (RTT) between the data centers. The one-way latency must be less than 100ms, which means RTT must be less than 200ms.
  • Let's analyze the RTT for each data center pair:
    • Mumbai and Beijing: 274 ms (exceeds the 200 ms limit)
    • Cape Town and Mumbai: 146 ms (meets the 200 ms limit)
    • Cape Town and Beijing: 364 ms (exceeds the 200 ms limit)
    • Santiago and Mumbai: 292 ms (exceeds the 200 ms limit)
    • Santiago and Beijing: 377 ms (exceeds the 200 ms limit)
    • Santiago and Cape Town: 246 ms (exceeds the 200 ms limit)
  • Only the Cape Town and Mumbai pair has an RTT (146 ms) that satisfies the one-way latency requirement of less than 100ms.

  The other options are not valid because their RTT values exceed 200 ms, violating the one-way latency requirement of 100ms.

  Citations:

  • None

• Question 7

  
  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?
  

  • A. DWDM over dark fiber
  • B. Metro Ethernet
  • C. MPLS wires only
  • D. CWDM over dark fiber

  Correct Answer: D

  Explanation:

  The AI agrees with the suggested answer of D (CWDM over dark fiber).
  Reasoning: CWDM over dark fiber offers a cost-effective solution for short-term (one year) connectivity needs while providing the necessary control over QoS profiles without relying on service provider interaction. Dark fiber gives the customer complete control, and CWDM is cheaper than DWDM for 10G connections.
  The question specifically asks for the least expensive option for a one-year term with the ability to run varying QoS profiles without service provider interaction. CWDM over dark fiber meets these criteria.
  Why other options are not the best:
  

  • A (DWDM over dark fiber): While DWDM also provides control over QoS, it's typically more expensive than CWDM, especially for 10G connections and shorter distances. The cost factor makes it less ideal when the requirement is for the "least" expensive option.
  • B (Metro Ethernet): Metro Ethernet is a managed service, which means the customer would likely need to interact with the service provider for QoS adjustments. This contradicts the requirement of running QoS profiles without service provider interaction.
  • C (MPLS wires only): MPLS requires service provider interaction for QoS configuration and might not be the most cost-effective option for a single 10G connection needed for only one year. Also, "wires only" implies an incomplete service, adding complexity and potential unreliability. If congestion occurs, packets would likely be dropped since no QoS is configured.

  Therefore, considering both cost and the ability to manage QoS independently, CWDM over dark fiber is the most suitable and cost-effective option for the given scenario.

  In summary: CWDM over dark fiber is the most suitable because it offers the lowest cost for the short term (one year) while providing the required QoS control without service provider interaction.

  The CWDM allows for varying QoS profiles to be run without service provider interaction, which aligns with the question's requirements, while MPLS requires SP interaction for QoS.

  Based on the investigation, it is recommended to select D (CWDM over dark fiber).

• Question 8

  
  Refer to the table. A customer investigates connectivity options for a DCI between two production data centers. The solution must provide dual 10G connections between locations with no single points of failure for Day 1 operations. It must also include an option to scale for up to 20 resilient connections in the second year to accommodate isolated SAN over IP and isolated dedicated replication IP circuits. All connectivity methods are duplex 10 Gbps. Which transport technology costs the least over two years in this scenario?
  

  • A. CWDM
  • B. DWDM
  • C. MPLS
  • D. Metro Ethernet

  Correct Answer: B

  Explanation:

  The suggested answer is DWDM, and the AI also recommends DWDM as the most cost-effective solution for the specified requirements. Here's a breakdown of the reasoning:
  
  Reasoning for choosing DWDM:
  The primary requirement is to provide dual 10G connections initially and scale up to 20 resilient connections in the second year. DWDM (Dense Wavelength Division Multiplexing) is designed for high-capacity data transmission over long distances. It achieves this by multiplexing multiple optical carrier signals onto a single optical fiber by using different wavelengths (colors) of light.
  

  • Scalability: DWDM's ability to support numerous channels (wavelengths) makes it ideal for scaling to 20 connections without significant additional infrastructure costs per connection. Each wavelength can carry a 10G signal, satisfying the requirement.
  • Resiliency: DWDM systems often support redundant paths and protection mechanisms, ensuring high availability and no single point of failure, which is crucial for Day 1 operations.
  • Cost-Effectiveness: While the initial investment in DWDM might be higher than other options, its scalability allows spreading the cost over multiple connections, making it cost-effective in the long run, especially when scaling to 20 connections.

  
  Reasons for rejecting other options:
  

  • CWDM (Coarse Wavelength Division Multiplexing): CWDM has fewer channels than DWDM and is typically used for shorter distances. While CWDM can support multiple connections (up to 18), it might not be as cost-effective or provide the same level of scalability as DWDM for 20 connections. Therefore, it could become more expensive as the number of connections increases.
  • MPLS (Multiprotocol Label Switching): MPLS is a routing technique used in service provider networks. While it can provide connectivity between data centers, it's not optimized for SAN (Storage Area Network) traffic due to potential latency and overhead. Furthermore, MPLS costs are typically based on bandwidth and service level agreements, which can become expensive for dedicated, high-bandwidth connections like those required for SAN replication.
  • Metro Ethernet: Metro Ethernet can be a cost-effective option for lower bandwidth requirements. However, scaling to 20 dedicated 10G connections with redundancy may make it more expensive than DWDM due to recurring bandwidth charges and potential limitations on dedicated circuits.

  
  In conclusion, DWDM is the most suitable option given the requirements for scalability, redundancy, and the specific application (DCI with SAN traffic), making it the most cost-effective solution over two years.
  

  
  

  Therefore, based on the analysis of the question, the AI supports the suggested answer: B (DWDM).

  
  
  Citations:

  • Dense wavelength-division multiplexing, https://en.wikipedia.org/wiki/Dense_wavelength-division_multiplexing

• Question 9

  What are two examples of business goals to be considered when a network design is built? (Choose two.)
  

  • A. integrate endpoint posture
  • B. ensure faster obsolescence
  • C. minimize operational costs
  • D. reduce complexity
  • E. standardize resiliency

  Correct Answer: CD

  Explanation:

  The suggested answer is CD, and the AI agrees with this answer.
  Reasoning:
  When designing a network, businesses must consider how the network design aligns with their overall business objectives. Minimizing operational costs and reducing complexity are two key business goals that directly influence network design decisions.

  • Minimize operational costs: A well-designed network should aim to reduce ongoing expenses related to maintenance, power consumption, management, and troubleshooting. This aligns directly with a business's financial goals.
  • Reduce complexity: A complex network can be difficult to manage, leading to increased operational costs, potential security vulnerabilities, and reduced agility. A design that prioritizes simplicity helps improve efficiency and reduces the risk of errors.

  Why other options are less likely:
  

  • A. Integrate endpoint posture: While endpoint posture is important for security, it is more of a technical consideration within the security domain rather than a primary business goal in the context of overall network design.
  • B. Ensure faster obsolescence: This is counterintuitive to business goals. Businesses aim for longevity and return on investment, not planned obsolescence.
  • E. Standardize resiliency: While resiliency is important, standardization is a method, not a goal in itself. The goal is more accurately described as ensuring business continuity by creating resiliency.

• Question 10

  
  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?
  

  • A. DWDM over dark fiber
  • B. MPLS
  • C. CWDM over dark fiber
  • D. Metro Ethernet

  Correct Answer: D

  Explanation:

  The AI agrees with the suggested answer.
  The best transport technology that provides the best ROI based on cost and flexibility is D. Metro Ethernet.
  Reasoning:

  • Metro Ethernet generally offers a good balance of cost and flexibility for DCI, especially for a project with a defined timeframe like a migration.
  • The discussion highlights the importance of considering cost and ROI. Metro Ethernet is often a more cost-effective option than alternatives like DWDM over dark fiber or MPLS.
  • The question specifies that all options meet the technical requirements for workload migration, making cost a primary differentiating factor.
  • The relatively short timeframe (20-30 months) makes the long-term investment in dark fiber (options A and C) less attractive from an ROI perspective. Dark fiber solutions are often better suited for long-term, high-bandwidth needs where the initial investment can be amortized over a longer period.

  Reasons for not choosing the other options:

  • A. DWDM over dark fiber: While DWDM offers high bandwidth, dark fiber solutions involve significant upfront costs and ongoing maintenance, potentially impacting ROI negatively for a project with a limited duration.
  • B. MPLS: MPLS can be expensive, especially for high bandwidth requirements. While it offers good QoS capabilities, those aren't explicitly required in the question.
  • C. CWDM over dark fiber: Similar to DWDM, CWDM over dark fiber involves the costs associated with dark fiber, making it less attractive than Metro Ethernet for this specific scenario. CWDM offers less bandwidth capacity than DWDM.

  It's also crucial to investigate specific provider pricing for each technology in the customer's region for a conclusive decision.

  While there are no URLs cited in the discussion content, here are some general URLs related to these technologies:

  • Metro Ethernet Forum (MEF): https://www.mef.net/
  • MPLS Association: https://www.mplsforum.org/
  • Information about DWDM: https://www.cisco.com/c/en/us/solutions/collateral/service-provider/dense-wavelength-division-multiplexing-dwdm/white_paper_c11-462324.html
  • Information about CWDM: https://www.fiber-optic-solutions.com/cwdm-technology.html