- Exam 300-420 ENSLD v1.1 runs 90 minutes through Pearson VUE and costs USD 300 plus applicable tax.
- Advanced Addressing and Routing Solutions and Advanced Enterprise Campus Networks each carry 25% of the exam.
- Cisco's March 19, 2026 minor update keeps v1.1 and adds BGP confederations, NSF/NSR, and multicast service-reflection.
- Passing earns Cisco Certified Specialist - Enterprise Design and satisfies the CCNP Enterprise concentration requirement; ENCOR is still required.
What the 300-420 Actually Tests
Designing Cisco Enterprise Networks (ENSLD) 300-420 is a design exam. That single fact should shape every hour you spend preparing. Where the ENCOR exam asks whether you can make a protocol work, the ENSLD asks whether you can choose the right protocol, topology, and feature set for a stated business and technical requirement, and defend that choice against alternatives.
The exam is the concentration exam for the Enterprise Design track. Passing it earns the Cisco Certified Specialist - Enterprise Design credential and fulfills the concentration requirement for CCNP Enterprise. The scope comes from Cisco's official exam objectives for Designing Cisco Enterprise Networks v1.1 (300-420), and everything you study should trace back to that blueprint. If you want a broader orientation first, our overview of what ENSLD certification is covers the basics, and the complete guide to all five content areas goes deeper on each objective.
Exam Logistics, Fee, and Delivery
Knowing the mechanics removes avoidable stress on exam day. Here is what Cisco publishes for the 300-420.
| Item | Detail |
|---|---|
| Exam code and version | 300-420 ENSLD v1.1 |
| Delivery provider | Pearson VUE |
| Fee | USD 300 plus applicable tax |
| Duration | 90 minutes |
| Languages | English and Japanese |
| Format | Proctored written exam, closed-book |
| Delivery options | Test center, or OnVUE online where eligible |
| Prerequisites | None formally required |
| Passing threshold | Determined statistically by Cisco |
Two points deserve emphasis. First, there are no formal prerequisites to sit the exam, but that is not the same as having no recommended background; see our breakdown of eligibility and prerequisites for how to think about readiness. Second, because Cisco determines the passing threshold statistically, you will not find a stable published cut score to aim for. Our passing score explainer walks through what that means for how you gauge readiness.
Closed-book and confidentiality rules apply to both test-center and OnVUE delivery. Review Cisco's examination policy and the Pearson VUE Cisco page before booking so you understand check-in requirements, the testing environment rules for online delivery, and rescheduling terms. For the full cost picture, including tax and retake considerations, see the certification cost breakdown, and for scheduling logistics use the exam dates and scheduling guide.
Domain-by-Domain Study Strategy
The blueprint has five domains totaling 100%. Two share the heaviest weight at 25% each, together making up half the exam. Allocate your study time accordingly, but do not neglect the 10% automation domain, which is often where well-prepared routing engineers lose easy points.
Domain 1: Advanced Addressing and Routing Solutions (25%)
This domain is about designing scalable, stable, and summarizable IP routing across the enterprise. Expect to compare options rather than configure them.
- OSPF and EIGRP design: area structure, summarization points, stub variants, and how topology affects convergence and failure domains
- BGP design for the enterprise: iBGP scaling with route reflectors, and, per the March 2026 update, BGP confederations
- Route redistribution and filtering: avoiding loops and suboptimal paths when multiple protocols or domains meet
- IPv4 and IPv6 addressing plans that support hierarchy and summarization
- Translating requirements such as fast convergence or limited route-table size into protocol and topology choices
Domain 2: Advanced Enterprise Campus Networks (25%)
Campus design questions probe layered architecture, resiliency, and the trade-offs between traditional and fabric-based approaches.
- Hierarchical campus design: when two-tier collapsed core is appropriate versus a full three-tier build
- Layer 2 versus routed-access designs, and their effect on spanning tree exposure and convergence
- High availability: first-hop redundancy, stateful switchover concepts, and NSF/NSR, which the March 2026 update adds
- Campus fabric and wireless design considerations, including how scale and roaming requirements affect architecture
- QoS and multicast considerations at the campus edge and distribution
Domain 3: WAN for Enterprise Networks (20%)
This domain covers how branches, data centers, and cloud connect, and how to choose between transport and overlay options.
- WAN transport selection and the trade-offs between private circuits, internet-based connectivity, and hybrid models
- Overlay design, including how SD-WAN-style approaches change redundancy, path selection, and policy
- Remote-site resiliency, dual-homing, and routing between overlay and underlay
- Cloud and internet edge connectivity from a design perspective
Domain 4: Network Services (20%)
Services questions ask how to design QoS, multicast, and related infrastructure services so applications behave predictably.
- QoS design: classification, marking, and queuing strategy across campus and WAN boundaries
- Multicast design: rendezvous point placement and redundancy, and, from the March 2026 update, multicast service-reflection
- Choosing where to apply policy so it is consistent end to end
- Network management and infrastructure services that affect design choices
Domain 5: Automation (10%)
The smallest domain, but the questions tend to be conceptual and very answerable if you prepare deliberately.
- Model-driven programmability concepts and why structured data models matter for design
- The role of APIs and common data formats in enterprise network operations
- How automation and controller-based approaches influence design decisions and operational workflows
Thinking Like a Designer, Not an Operator
Candidates who come from a pure operations background often find the 300-420 uncomfortable because the right answer depends on requirements rather than on a command output. The cure is to practice a consistent mental routine on every scenario.
- Extract the hard requirements. Identify stated constraints: scale, convergence expectations, security boundaries, budget, and existing platforms.
- Separate must-haves from nice-to-haves. A requirement phrased as mandatory eliminates options immediately.
- Eliminate answers that violate a constraint. Do this before comparing the survivors.
- Pick the option with the fewest trade-offs against the requirement set. The correct answer is often the simplest design that satisfies everything stated.
If you are still gauging how demanding this style of questioning is, our difficulty guide discusses what makes the exam challenging, and the pass rate article explains why no reliable public figure should drive your plan.
The March 2026 Minor Update
Cisco published release notes for a CCNP Enterprise minor update dated March 19, 2026. The ENSLD retains its v1.1 designation, so do not assume you need different materials by version number alone. What changed is scope: the update adds BGP confederations, NSF/NSR, and multicast service-reflection.
Many older study resources predate this addition, so verify coverage of these topics in whatever you use, and fill gaps from Cisco documentation.
Where the New Topics Fit
Map each addition to the domain where it is most likely to appear in a scenario.
- BGP confederations: Domain 1. Understand them as an alternative to route reflectors for scaling iBGP, including sub-AS design and how path attributes behave across sub-AS boundaries.
- NSF/NSR: Domain 2 and resiliency discussions generally. Know what each preserves during a supervisor or control-plane failure, and how they differ in dependence on neighbor cooperation.
- Multicast service-reflection: Domain 4. Understand the design problem it solves when multicast must be translated or re-presented between different address domains or services.
Always confirm the current objective list against Cisco's official exam topics page before finalizing your plan, since this is the authoritative scope source.
A Domain-Ordered Study Sequence
Rather than a generic schedule, order your study to match how the domains build on each other. Routing and addressing come first because campus, WAN, and services design all assume you can reason about route propagation and summarization. The timeline below assumes you already hold working CCNP-level knowledge from ENCOR; compress or extend it to suit your background. For a deeper resource list, see our training options overview.
Domain 1: Addressing and Routing
- Redesign sample topologies for OSPF, EIGRP, and BGP, writing down summarization and failure-domain choices
- Study route reflectors and confederations side by side
- Practice redistribution scenarios and loop-avoidance reasoning
Domain 2: Campus Networks
- Compare two-tier, three-tier, and routed-access designs against stated requirements
- Review first-hop redundancy, NSF/NSR, and convergence behavior
- Cover fabric and wireless design considerations
Domain 3: WAN
- Build a decision table for transport and overlay selection
- Work through dual-homing and underlay/overlay routing interactions
Domains 4 and 5: Services and Automation
- QoS and multicast design, including service-reflection
- Programmability and data-model concepts in a short, focused block
Integration and Timed Practice
- Take full-length practice sets under the 90-minute limit
- Review every miss by asking which requirement you overlooked
The one-page cheat sheet is useful for last-week review of protocol behaviors and design rules of thumb, but it should supplement your scenario practice rather than replace it. When you are ready to test yourself under realistic conditions, use the ENSLD practice tests to check how well you handle requirement-driven questions across all five domains.
Key Takeaway
After every practice question, write one sentence naming the requirement that decided the answer. Over time you will notice the same few constraint types, such as convergence, scale, and operational simplicity, deciding most scenarios.
After You Pass: Credential and Renewal
Passing the 300-420 earns Cisco Certified Specialist - Enterprise Design. It also fulfills the concentration requirement for CCNP Enterprise, but the full CCNP Enterprise additionally requires the ENCOR core exam. If you have already passed ENCOR, the ENSLD completes the pairing.
| Credential | Validity Cycle | Continuing Education Requirement |
|---|---|---|
| Cisco Certified Specialist - Enterprise Design | Three years | 40 CE credits earned before expiry |
| CCNP Enterprise | Three years | 80 CE credits |
Renewal options and qualifying activities are detailed on Cisco's recertification and continuing education pages, so confirm current rules there when you plan. To weigh the credential's career value, read our ROI analysis, review the salary guide, and explore the kinds of roles in our jobs overview. Design-focused credentials tend to appeal to employers that run complex campus, WAN, and data-center environments and need people who can plan changes rather than only execute them.
Frequently Asked Questions
The exam runs 90 minutes and costs USD 300 plus applicable tax. It is delivered through Pearson VUE, and fees and provider policies are maintained on Cisco's certification FAQ.
There are no formal prerequisites for the exam, so you can sit it in any order. However, ENCOR is still required for the full CCNP Enterprise certification, and its content is a strong foundation for design study.
Advanced Addressing and Routing Solutions and Advanced Enterprise Campus Networks each account for 25% of the exam, so they deserve the most time. WAN for Enterprise Networks and Network Services are 20% each, and Automation is 10%.
No. Cisco's minor update retains the v1.1 designation but adds BGP confederations, NSF/NSR, and multicast service-reflection to the scope, so check your study materials cover them.
Yes, where eligible. The exam is a proctored written test available at test centers and through OnVUE online delivery, with closed-book and confidentiality rules applying either way. Review Pearson VUE and Cisco's examination policy before booking.
The Cisco Certified Specialist - Enterprise Design award is valid for three years and can be renewed with 40 continuing education credits earned before it expires.
For a consolidated view of the study approach covered here, revisit the main ENSLD study guide, and when you are ready to measure your readiness, head to the practice test site for scenario-based questions aligned to the 300-420 domains.