Cisco CCDE written exam Exam Practice Test
The Cisco CCDE written exam (400-007) focuses on designing large-scale networks to meet business and technical requirements. The practice bank samples architecture decisions involving routing policy, campus and data-center topology, wireless coverage, service placement, traffic protection, and migration planning. These scenarios call for comparing design options by performance, resilience, scalability, and operational impact.
Exam overview
About the Cisco CCDE written exam Exam
Network design work begins with constraints such as traffic patterns, geographic distribution, availability targets, and failure boundaries. The scenarios in this practice bank explore choices including leaf-spine versus three-tier data-center fabrics, centralized versus regional services, and route summarization or default routing to limit routing-table detail. Other questions address equal-cost multipath, OSPF design, external reachability, encrypted links, and Layer 2 loop prevention while making use of redundant uplinks. Several situations emphasize validating a design in operation: defining a service-migration plan, measuring response time, or comparing network behavior before and after a policy change. Working through them develops the habit of connecting protocol and topology choices to user experience, failure recovery, and manageability rather than treating configuration features in isolation.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
A network team needs to confirm whether a new routing policy improves service after deployment. Which operational practice provides the strongest basis for evaluating the result?
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Correct answer: AA baseline and measurable targets allow before-and-after comparison. Monitoring both routing behavior and service-relevant metrics helps distinguish configuration success from actual end-to-end improvement.
A company is planning a wireless network for a large office. The design must support roaming users and maintain service in areas where one access point may fail. Which planning input is most important before selecting access-point locations?
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Correct answer: ARadio-frequency conditions determine usable coverage, client capacity, and interference. A survey, validated against real building materials and expected client density, provides a sound basis for placement and channel planning.
An enterprise must choose between a centralized network service and multiple regional instances. Users are distributed globally, and the service is sensitive to response time. Which evaluation method best supports the decision?
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Correct answer: BService placement involves tradeoffs among user latency, resilience, consistency, and operational complexity. Comparing these factors using representative conditions supports a defensible choice; regional deployment is not automatically superior if synchronization or management requirements dominate.
A design team is comparing two data-center fabrics: one uses a traditional three-tier hierarchy, while the other uses a leaf-spine topology. Which traffic pattern most commonly makes leaf-spine attractive?
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Correct answer: BLeaf-spine provides predictable, low-hop paths between server-facing leaf switches and is well suited to substantial east-west traffic. The topology still requires careful sizing, routing, and failure-domain design.
An enterprise wants internal routers to learn external reachability while limiting the volume of Internet routing information they must store. Which design choice is generally appropriate for the internal routers?
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Correct answer: BA default route can direct Internet-bound traffic to an edge that handles external routing, reducing routing-table size and complexity inside the enterprise. The edge still needs an appropriate external-routing design.
A network carries sensitive traffic over links that may be accessible to parties outside the organization. Which design decision most directly protects the confidentiality of that traffic in transit?
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Correct answer: AEncryption protects confidentiality over untrusted transport, while sound key management and endpoint validation help ensure that the intended parties participate in the secure connection. Routing metrics, shaping, and subnet sizing do not provide confidentiality.
A campus design uses multiple Layer 2 links between switches, but only one link forwards for a VLAN because spanning tree blocks the others. The goal is to use available uplinks while retaining a loop-free Layer 2 topology. What is the most suitable approach?
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Correct answer: BA link aggregation bundle can present several compatible physical links as one logical connection, allowing their combined capacity to be used while spanning tree treats the bundle as a single path. Disabling loop prevention risks broadcast storms and instability.
How to use this practice test
Access is free. Each session draws up to 20 random questions from the 50-question bank, so a session may not include every scenario. Results appear after you finish; use them to identify which design decisions or networking concepts need closer review.
Preparation tips
- For routing scenarios, distinguish internal reachability needs from full Internet-route requirements; consider default routes, route summarization, and the resulting failure behavior.
- Sketch leaf-spine and three-tier topologies, then trace east-west and north-south traffic to compare path length, capacity, and failure impact.
- For wireless planning questions, account for coverage, roaming, capacity, and access-point failure before settling on locations.
- When reviewing migrations or policy changes, identify success measures, transition dependencies, rollback conditions, and how service reachability will be tested.
- Compare resilience mechanisms by what they protect: equal-cost paths distribute traffic, encryption protects data in transit, and loop prevention controls Layer 2 forwarding.