What Is A ENSLD?

What the ENSLD Actually Is

The acronym ENSLD is used by several unrelated credentials, so it is worth pinning down. On this site, ENSLD refers to one thing only: Designing Cisco Enterprise Networks, exam code 300-420. It is a Cisco certification exam, currently published as version 1.1, and it tests whether you can make sound design decisions for enterprise networks rather than simply configure them.

That distinction matters. Many Cisco exams reward command-line recall and troubleshooting speed. The 300-420 rewards judgment: given a set of business requirements, constraints and existing infrastructure, which routing protocol, redundancy model, WAN transport or services architecture is the best fit, and why? If you want a broader orientation on the acronym itself, our explainers on what ENSLD is and what ENSLD stands for cover the naming in more depth.

Cisco publishes the official scope in its exam objectives document, Designing Cisco Enterprise Networks v1.1 (300-420). Everything in this article about content areas traces back to that blueprint and to Cisco's published exam and certification pages.

Who the Exam Is Built For

The 300-420 targets network engineers and architects who are moving from implementing networks to planning them. Typical candidates include:

• Network engineers who already hold or are pursuing CCNP Enterprise and need a concentration exam
• Design-focused engineers and solutions architects at integrators, service providers and enterprise IT teams
• Pre-sales and systems engineers who must justify architecture choices to customers
• Engineers responsible for campus, WAN and services refreshes who want formal validation of their design reasoning

There are no formal exam prerequisites. Cisco does not require you to hold another certification before sitting for 300-420. That said, the content assumes fluency in enterprise routing, switching and WAN fundamentals. Our ENSLD requirements guide explains what "no prerequisites" means in practice versus what you realistically need to know going in.

Where It Fits in the Cisco Certification Path

CCNP Enterprise is built from two exams: a core exam and a concentration exam. The core exam is ENCOR. The concentration exam is your choice from a menu, and the 300-420 is one of the options. Passing it does two things at once:

• It earns the standalone Cisco Certified Specialist - Enterprise Design credential.
• It fulfills the concentration requirement for CCNP Enterprise.

To complete the full CCNP Enterprise, you still need ENCOR as well. This stacking structure is one reason the exam is attractive: you earn a recognized specialist credential immediately, and it counts toward the larger professional-level certification.

Exam Logistics: Fee, Format and Delivery

Here are the concrete mechanics, all drawn from Cisco's published exam and policy pages:

• Fee: USD 300 plus applicable tax. See our ENSLD certification cost breakdown for what else can add to the total, such as retakes and study materials.
• Duration: 90 minutes.
• Languages: English and Japanese.
• Provider: Pearson VUE, which handles registration and delivery.
• Delivery: a proctored written exam, available at test centers and, where eligible, through OnVUE online proctoring.
• Rules: closed-book conditions and confidentiality requirements apply. You may not bring notes or reference materials into the session, and you agree not to disclose exam content.

Cisco determines passing thresholds statistically rather than publishing a fixed percentage, so you will not find an official "you need X%" figure. We explain what that means for your preparation in our ENSLD passing score guide, and for scheduling considerations see ENSLD exam dates and scheduling.

The Five Domains in Detail

The official blueprint divides the exam into five domains totaling 100%. Two domains are tied for the heaviest weight, which makes the first half of your preparation disproportionately important. For a domain-by-domain walkthrough, see our complete ENSLD exam domains guide.

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%)

The Design Mindset the Questions Reward

What separates this exam from implementation-focused ones is the nature of the right answer. Rather than asking "what command enables X," questions tend to present a customer scenario and ask which design best satisfies the stated requirements. Several habits help:

• Find the constraint first. Is the scenario driven by scale, fast convergence, operational simplicity, budget or a compliance need? The deciding factor usually eliminates two options immediately.
• Think in trade-offs. Every design choice buys something and costs something. Be ready to articulate what a choice gains and what it gives up.
• Know the failure story. Good designers reason about what happens when a link, device or site fails. Convergence behavior and blast radius appear throughout the blueprint.
• Prefer hierarchy and modularity. Summarization boundaries, layered campus design and clean failure domains are recurring themes.

If you are weighing whether this style of exam suits you, our ENSLD difficulty guide looks at what tends to trip candidates up, and our ENSLD pass rate article explains why published pass-rate claims should be treated cautiously.

The March 2026 Minor Update

The exam remains designated v1.1, but Cisco issued a minor update to the CCNP Enterprise exam topics, documented in release notes dated March 19, 2026. The update retains the v1.1 designation while adding three topic areas that candidates should now treat as in scope:

• BGP confederations, a technique for scaling iBGP by dividing an autonomous system into sub-autonomous systems
• NSF/NSR, nonstop forwarding and nonstop routing, which relate to maintaining forwarding and routing state through control-plane disruptions
• Multicast service reflection, a multicast services topic relevant to translating or reflecting multicast traffic

Because these were added without a version bump, older study materials may not cover them. Check any resource you rely on against the current official objectives and the release notes, and make sure your preparation addresses these three items explicitly.

Sequencing Your Preparation by Domain

The blueprint weights suggest an order of attack. Front-load the two 25% domains, since together they account for half the exam and the routing concepts also support WAN and services topics later. A compact way to organize the work:

For a fuller plan, see our ENSLD study guide, and keep our ENSLD cheat sheet handy for final review. When you are ready to test your recall under realistic conditions, try the practice questions at 300420exam.com.

Roles and Career Relevance

Design credentials tend to matter most where architecture decisions are made and defended. Employers that commonly value this skill set include enterprise IT organizations running large campus and WAN estates, network integrators and managed service providers, Cisco partners, and consultancies that deliver design and migration projects. Job titles where the knowledge applies include network engineer, network architect, solutions architect, systems engineer and design consultant.

The credential signals that you can reason about architecture, not just operate it, and it contributes directly to the CCNP Enterprise credential many employers recognize. We avoid quoting unsourced earnings numbers here; for a measured look at the topic, see our ENSLD salary guide, our ENSLD jobs overview and our ROI analysis.

Validity and Renewal

The Cisco Certified Specialist - Enterprise Design award is valid for three years. You can renew it by earning 40 continuing education (CE) credits before it expires. The full CCNP Enterprise certification also has a three-year cycle, with an 80-CE requirement. Cisco publishes the qualifying activities on its recertification and continuing education pages, and the details can change, so verify them on Cisco's site before planning your renewal path.

Frequently Asked Questions