ENSLD Design Case Studies¶
Eight original design case studies written against the ENSLD 300-420 v1.1 exam topics. ENSLD is a design exam with no configuration simulations, so these cases are the closest practice: a company, a current network, requirements and constraints, then design questions where you pick the best option and see why the alternatives fail. None of them reproduce real exam content.
How to use the cases¶
- Read the background, the current network diagram, the requirements and the constraints before you look at any question.
- Write down the two or three requirements that will decide between options. Design answers are usually decided by a constraint, not by a feature list.
- Answer each question before opening the collapsible answer.
- Read the explanation for the wrong options too. The exam writes wrong answers that are good designs for a different set of requirements.
- Compare your own design with the recommended design at the end.
Design-exam habits
Ask what fails, how fast it fails over, how the design grows and what it costs to run. The best answer rarely uses the newest technology; it meets the stated requirements with the least extra risk.
The eight cases¶
| Case | Title | Blueprint | Difficulty |
|---|---|---|---|
| 01 | Addressing plan and IPv6 migration | 1.1, 1.6 | Medium |
| 02 | Multi-area routing and BGP edge design | 1.2, 1.4, 1.5 | Hard |
| 03 | Campus high availability and Layer 2 design | 2.1, 2.2, 2.3 | Medium |
| 04 | SD-Access migration | 2.4, 2.5 | Hard |
| 05 | WAN and VPN selection with high availability | 3.1, 3.2, 3.3, 4.3 | Medium |
| 06 | SD-WAN design | 3.4, 3.5 | Hard |
| 07 | QoS and multicast for a media company | 4.1, 4.2, 4.4, 4.5 | Hard |
| 08 | Automation, telemetry and cloud connectivity | 5.1 to 5.6 | Medium |
See also the ENSLD cram sheet.
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