- How the 300-420 Blueprint Is Built
- Domain Weights at a Glance
- Domain 1: Advanced Addressing and Routing Solutions (25%)
- Domain 2: Advanced Enterprise Campus Networks (25%)
- Domain 3: WAN for Enterprise Networks (20%)
- Domain 4: Network Services (20%)
- Domain 5: Automation (10%)
- What the March 2026 Minor Update Adds
- Sequencing Your Study Around the Weights
- Exam Mechanics That Affect Your Domain Strategy
- Frequently Asked Questions
- The 300-420 ENSLD v1.1 blueprint has five domains; Addressing/Routing and Campus Networks each carry 25%.
- WAN and Network Services are weighted 20% each; Automation is the smallest domain at 10%.
- Cisco's March 19, 2026 minor update keeps v1.1 and adds BGP confederations, NSF/NSR and multicast service-reflection.
- The exam runs 90 minutes through Pearson VUE and costs USD 300 plus applicable tax.
How the 300-420 Blueprint Is Built
Designing Cisco Enterprise Networks (300-420), commonly shortened to ENSLD, is the concentration exam in the CCNP Enterprise track that tests design judgment rather than configuration recall. You are not asked to type commands. You are asked to choose an architecture, justify a protocol or topology, and recognize which design best satisfies a stated business or technical constraint. That framing matters when you read the domain list, because every domain below is really a set of design decisions: which routing protocol, which campus model, which WAN transport, which service placement, which automation approach.
Cisco publishes the scope in its official exam objectives for Designing Cisco Enterprise Networks v1.1 (300-420). Five domains total 100% of the exam. Passing the exam earns the Cisco Certified Specialist - Enterprise Design credential and fulfills the concentration requirement for CCNP Enterprise, which also requires the ENCOR core exam. There are no formal prerequisites, a point covered in detail in our guide to ENSLD requirements, eligibility and prerequisites.
If you are still orienting yourself to the credential itself, start with what ENSLD certification is and come back here once the basics are clear.
Domain Weights at a Glance
The weights below come straight from the official blueprint. Treat them as a budget for your study hours, not as a guarantee of how many questions you will see from each area on a given sitting.
| Domain | Name | Weight |
|---|---|---|
| 1 | Advanced Addressing and Routing Solutions | 25% |
| 2 | Advanced Enterprise Campus Networks | 25% |
| 3 | WAN for Enterprise Networks | 20% |
| 4 | Network Services | 20% |
| 5 | Automation | 10% |
Two domains together account for half the exam. That concentration is the single most useful fact for planning: a candidate who is strong on routing design and campus design has a large share of the exam under control before touching WAN, services or automation.
Domain 1: Advanced Addressing and Routing Solutions (25%)
This domain tests whether you can design an IP addressing plan and a routing architecture that scales, converges predictably and stays manageable. Expect scenario questions where you must pick between protocols, summarization strategies or redistribution approaches given a topology and a set of requirements.
What candidates must understand
Design-level reasoning about IPv4 and IPv6 addressing, IGP and BGP behavior, and how routing domains interconnect without creating loops or instability.
- Hierarchical addressing and summarization boundaries, and how they limit the scope of failures and route churn
- OSPF and EIGRP design choices, including area structure, stub types, and when each protocol fits an environment
- BGP design, including route reflectors and confederations for scaling iBGP, plus policy tools for path selection
- Redistribution and route filtering, including how to avoid suboptimal routing and feedback loops between domains
- IPv6 deployment and transition considerations in an enterprise context
- Fast convergence mechanisms and their trade-offs against stability
Where candidates lose points here
The common failure is answering as an operator rather than as a designer. A question may describe flapping links, a large number of routers in a single area, or a merger of two routing domains. The right answer is usually the one that addresses scale or fault isolation structurally, not the one that tunes a timer. Practice reading the constraint first (growth, convergence time, administrative boundary) and only then evaluating the options.
Domain 2: Advanced Enterprise Campus Networks (25%)
Campus design carries the same weight as routing and rewards candidates who think in terms of layers, failure domains and resiliency. This domain covers how access, distribution and core (or collapsed variants) are built, how Layer 2 and Layer 3 boundaries are drawn, and how the campus delivers high availability.
What candidates must understand
How to select and justify a campus architecture and the redundancy mechanisms that keep it available during failures and upgrades.
- Hierarchical versus collapsed-core designs, and routed-access versus traditional Layer 2 access trade-offs
- Spanning tree behavior and when to eliminate its dependence through Layer 3 or virtualization approaches
- First-hop redundancy and how it interacts with routing and failure detection
- Fabric-based and software-defined campus concepts and how they change design assumptions
- Wireless design considerations as part of the campus, including controller placement and roaming implications
- High availability features at the platform level, including stateful switchover concepts
Design reasoning to practice
Campus questions often hinge on identifying the real risk in a topology: a large Layer 2 domain, a single point of failure at distribution, or a design that cannot be upgraded without an outage. Build the habit of sketching the failure scenario mentally. If a distribution switch fails, what traffic is lost, and how long until recovery? Answers that shrink the blast radius and speed recovery tend to be the correct ones.
The wireless and fabric topics here are where many candidates with a strong routing background feel least comfortable, so allocate time for them deliberately. Our ENSLD difficulty guide discusses which areas candidates tend to find hardest and why.
Domain 3: WAN for Enterprise Networks (20%)
The WAN domain focuses on connecting sites and users across carrier and internet transports. The design questions center on transport selection, overlay architecture, resiliency and the performance trade-offs of each approach.
What candidates must understand
How to choose and combine WAN technologies to meet connectivity, cost, security and availability requirements for branches, data centers and cloud.
- Comparing private WAN, internet-based and overlay options, and the situations each suits
- SD-WAN architecture, including how control, management and data planes are separated and where policy is applied
- Traditional overlay approaches such as DMVPN and how they compare with controller-based designs
- Dual-transport and multi-homed designs, path selection and failover behavior
- Internet and cloud connectivity patterns, including direct internet access at the branch and regional breakout
- WAN edge routing integration with the enterprise BGP and IGP design from Domain 1
The cross-domain link
WAN questions regularly lean on Domain 1 knowledge. A branch dual-homed to two transports raises BGP path-selection and failover questions as much as transport questions. If you studied routing in isolation, revisit it with WAN scenarios in mind. For the overall question style and how scenarios are framed, see our ENSLD study guide.
Domain 4: Network Services (20%)
This domain covers the services that ride on top of the network and must be designed into it: quality of service, multicast, and the service-level concerns that determine whether applications perform.
What candidates must understand
How to design services that behave correctly end to end across campus and WAN, not just on a single device.
- QoS design, including classification and marking strategy, trust boundaries, queuing and policing or shaping choices across different link types
- Multicast design, including PIM modes, rendezvous point placement and redundancy, and scaling considerations
- Multicast across domains and special topologies, including service-reflection concepts after the March 2026 update
- Network visibility and monitoring concepts that support design decisions and service assurance
- Application-driven requirements, such as voice, video and critical business traffic, and how they shape treatment
Domain 5: Automation (10%)
Automation is the smallest domain, but it is not trivial and it is not coding. The exam tests whether you understand how programmability and model-driven approaches change network design, and which tools and interfaces fit which problems.
What candidates must understand
The concepts and building blocks of network programmability at a design level.
- Model-driven programmability and the role of data models and structured data formats
- Common programmatic interfaces and protocols used to configure and retrieve state from devices
- Controller-based and intent-based approaches, and how they differ from device-by-device management
- Configuration management and orchestration tooling concepts, and where automation reduces risk
- Telemetry and monitoring approaches that complement automated operations
Because this domain is only 10%, it is tempting to skip it. That is a poor trade when it is also the area where hands-on candidates who have never touched APIs or data models can pick up straightforward points with modest effort. A focused few sessions is usually enough to cover recognition-level questions.
What the March 2026 Minor Update Adds
Cisco's CCNP Enterprise minor update release notes, dated March 19, 2026, retain the v1.1 designation for this exam rather than creating a new version number. The notes add three topics that candidates should now treat as in scope:
- BGP confederations, which sit naturally in Domain 1 alongside route reflectors as a way to scale iBGP
- NSF/NSR (nonstop forwarding and nonstop routing), a high availability topic that connects Domain 1 routing resiliency with Domain 2 platform availability
- Multicast service-reflection, which belongs with the multicast material in Domain 4
The practical consequence is that older study materials written before this update may not cover these three topics. Verify any resource you use against the current official objectives, and fill gaps from Cisco documentation where needed. A study plan built on the blueprint alone is safer than one built on a book that predates the change.
Key Takeaway
Print the current official objectives and tick off each bullet against your study resources. Anything you cannot map to a chapter or lab, especially the three March 2026 additions, is a gap to close before you book the exam.
Sequencing Your Study Around the Weights
Rather than a generic schedule, order your effort by dependency and weight. Routing underpins WAN and campus Layer 3 decisions, so it comes first. Services depend on understanding the topology they run across, so they come later. A sample sequence over six weeks:
Domain 1: Addressing and Routing
- Addressing hierarchy, summarization, OSPF/EIGRP design
- BGP scaling with route reflectors and confederations
- Redistribution and filtering scenarios
Domain 2: Campus Networks
- Layered and routed-access designs, failure-domain analysis
- Fabric and wireless design concepts
- NSF/NSR and platform high availability
Domains 3 and 4: WAN and Network Services
- SD-WAN versus overlay designs and dual-transport failover
- QoS placement and multicast design, including service-reflection
Domain 5 and full review
- Programmability, data models and controller concepts
- Timed mixed-domain practice, then revisit weakest domain
Adjust the pacing to your background. A candidate who designs campus networks daily can compress Weeks 3-4; someone coming from a pure operations role may need extra time in WAN. For a fuller plan, read our study guide, and keep the ENSLD cheat sheet handy for last-week review.
Exam Mechanics That Affect Your Domain Strategy
The exam is 90 minutes, delivered through Pearson VUE, in English and Japanese. It is a proctored written exam available at test centers and, where eligible, through OnVUE online delivery. It is closed-book, and Cisco's confidentiality rules apply, so there are no reference materials and no sharing of exam content. The fee is USD 300 plus applicable tax. Our certification cost breakdown covers fee mechanics in more detail, and the exam dates and scheduling guide explains booking.
Cisco determines passing thresholds statistically, so there is no fixed percentage to aim for; see what is known about the ENSLD passing score. What this means for domain strategy is simple: do not try to engineer a minimum. Build competence across all five domains, with depth where the weights are highest.
Time management matters in a design exam because scenario questions are wordy. Read the requirement or constraint before the options, eliminate answers that violate it, and move on rather than re-deriving a protocol from first principles. Mixed-domain timed practice on the ENSLD practice test site is the best way to calibrate your pace against the 90-minute limit.
Why the credential is worth planning around
Passing earns the Cisco Certified Specialist - Enterprise Design credential, valid for three years and renewable with 40 continuing education credits earned before expiry. The same pass fulfills the concentration requirement for CCNP Enterprise, which has its own three-year cycle and an 80-CE requirement and also needs ENCOR. Design roles such as network architect, solutions designer and pre-sales engineer are where this specialization is most visible; see our overviews of ENSLD-related jobs and whether the certification is worth it. To check the other published exam facts and compare against your own plan, the main practice test hub links to every guide.
Frequently Asked Questions
Advanced Addressing and Routing Solutions and Advanced Enterprise Campus Networks each account for 25% of the 300-420 exam, together making up half of the blueprint. WAN for Enterprise Networks and Network Services follow at 20% each, and Automation is 10%.
No. Cisco's minor update release notes dated March 19, 2026 retain the v1.1 designation. They add BGP confederations, NSF/NSR and multicast service-reflection to the scope, so verify your study materials cover them.
It is a proctored written exam focused on design decisions. You evaluate topologies and requirements and choose appropriate architectures and technologies, rather than configuring devices in a lab. Hands-on experience still helps you reason about behavior.
It is risky to skip it. The domain is conceptual and recognition-focused, so a few concentrated study sessions can secure points that would otherwise be lost. Ignoring a whole domain also leaves no margin for error elsewhere.
Passing 300-420 earns Cisco Certified Specialist - Enterprise Design and fulfills the CCNP Enterprise concentration requirement. CCNP Enterprise also requires passing the ENCOR core exam, and both credentials renew on a three-year cycle through continuing education.