I recently passed the CCDE practical exam at Cisco Live. I am now CCDE #2026::37. During my preparation, I gathered insights from fellow candidates, seasoned CCDEs, and instructors, including Zig Zsiga, Russ White, Orhan Ergun, Mark Holm, and others. I combined them with my own experience on exam day: it took me three attempts to pass, so I have some experience. This post is my attempt to distill all of that into a practical guide for anyone sitting for the CCDE lab.
This post is the first of two about the CCDE practical exam. It focuses exclusively on the exam-day strategy and execution. A companion post will cover the preparation: the study material, resources, and approach I used in the months and years leading up to the lab. Stay tuned.
CCDE Practical Exam — Tips and Tricks for Exam Day
Shift Your Mindset: WHY, Not HOW or WHAT
This is the most fundamental difference between the CCDE practical and every other Cisco professional or expert exam you have taken. The exam does not care how you configure a feature or what the command syntax is. It tests whether you understand why a design decision is the right one, given a specific business context.
Every answer you give must be traceable back to a business constraint or requirement. Best practices could be a starting point, but not a destination. If, in the scenario, the customer’s constraints lead you somewhere that totally deviates from best practice, follow the constraints. That is the correct answer.
Design for the problem in front of you, not the problem you wish you had.
Read Everything… All of It!
Each scenario is roughly 20 pages of documentation. Budget 15 to 20 minutes just for the initial read-through, and treat that time as well spent, not lost. The information is not always where you expect it. Constraints, requirements, and hints can be buried in topology diagrams, footnotes, or appendices. Miss them, and you may spend the rest of the scenario working from incomplete assumptions.
Take notes as you read, but be very selective. You have pen and paper; use them for the critical constraints and requirements only. Do not try to reproduce the scenario in your notes, and do not draw network diagrams. It takes too long and adds no value. Keep your notes lean and actionable.
If you want to highlight text on screen, you can; there is a tool for that. But limit yourself to one or two colors and highlight only very specific, precise information. Personally, I skipped highlighting entirely and just noted the key constraints and requirements on paper. Find what works for you, but keep it lightweight.
Never assume anything
If something is not explicitly stated in the scenario documentation, do not assume it. This is one of the most common sources of wrong answers in the CCDE practical. The exam is deliberately constructed so that all the information you need is provided. If a piece of information is missing, the correct move is to identify that you need it, not to fill the gap with your own experience or intuition.
This also means: do not over-engineer. Design for what is asked, nothing more.
Understand the Four Scenario Types
From experience and community guidance, CCDE practical scenarios tend to fall into one of four task domains:
- Merge & Divest — integrating or separating network environments, typically driven by business restructuring.
- Add Technologies — introducing a new capability into an existing design.
- Replace Technology — migrating from one solution to another with minimal disruption.
- Scaling — extending an existing design to meet growth requirements.
Recognising which type of scenario you are in will help you frame your thinking quickly and focus on the right set of trade-offs.
Handle Branching Questions with Care
Some questions are structured as a sequence: first, you make a design decision, then you are asked to justify it, and subsequent questions may build on your initial choice. If you go down the wrong branch on the first question, the follow-on answers can all be wrong as a result.
Take your time on these. Eliminate incorrect options methodically rather than committing to the first answer that seems reasonable. Also note that business and technical justifications are generally kept separate in the “why” questions.
One specific trap to avoid: if a question asks you what information you still need from the customer, and the answer is already written somewhere in the scenario documentation, do not ask for it. That answer is wrong. The exam expects you to have read and retained the information already provided.
Respect the Customer’s Choices
If the scenario presents a sub-optimal design, like something you fully disagree with, your job is not to “correct” the customer. Answer all questions within the context of the design as given. The exam tests your ability to reason within constraints, not to override them.
Similarly, always consider the customer’s business requirements as the primary filter. Technical elegance is secondary.
Drawing and Table Questions Are High Value
Not all questions carry equal weight. Drawing questions and table-based answers are typically worth significantly more points than a single multiple-choice question. Allocate your time accordingly; do not rush through these to save time elsewhere. A careless mistake on a table question can cost you more than a wrong single-choice answer.
Manage Your Energy Across the Day
The CCDE practical is a full-day exam. Energy and focus management matter as much as technical knowledge.
Between scenarios: make a genuine mental reset. There is no continuity between scenarios; each one is completely independent. Take the short break between them seriously. Get up, get a coffee, step outside if you can. Carrying mental residue from one scenario into the next is a real risk. Taking five minutes between two scenarios is definitely worth it.
Lunch: take the full allowed break. Eat something, go get some fresh air if you can, and do not spend the break thinking about your past scenario or your past answers. You need to come back to the afternoon scenarios with a clear head. Do not eat too much! A heavy meal will work against your focus.
The Cisco Documentation Is Available
One practical note: on the exam workstation, there is a desktop shortcut that gives you access to the Cisco documentation portal. Use it when you need to verify a specific technical detail, but do not rely on it as a primary resource. The exam is not a documentation lookup exercise.
A Summary of the Key Principles
- Think WHY, not HOW or WHAT.
- Read everything before answering anything: 15 to 20 minutes per scenario.
- Take lean, targeted notes; no diagrams.
- Never assume what is not stated; also, do not over-engineer.
- Design for the problem in front of you.
- Follow customer business constraints and requirements over best practices.
- Handle branching questions carefully; eliminate before committing.
- Never ask for information that is already in the document.
- Accept sub-optimal customer decisions and work within them.
- Invest extra time on drawing and table questions.
- Reset fully between scenarios.
- Take a real lunch break.
What’s Next
This post covers exam-day execution only. If you are still in the preparation phase, studying the blueprint, choosing resources, and building your design mindset, I will cover this in a separate post.
If you have questions or want to share your own experience, feel free to leave a comment below.
Top picture from Josh Sorenson on Unsplash