- The Short Answer: What ENSLD Stands For
- Decoding the Name: Enterprise Network Design
- Where 300-420 Sits in the Cisco Certification Path
- Exam Facts at a Glance
- The Five Domains Behind the Acronym
- Why "Designing" Changes How You Study
- Who Uses This Credential and What Roles It Supports
- Registration, Fees, and Delivery Mechanics
- Sequencing Your Preparation by Domain Weight
- What Happens After You Pass
- Frequently Asked Questions
- ENSLD refers to the Cisco exam 300-420, Designing Cisco Enterprise Networks, currently version 1.1.
- Passing earns Cisco Certified Specialist - Enterprise Design and satisfies the CCNP Enterprise concentration requirement.
- The exam runs 90 minutes, costs USD 300 plus applicable tax, and is delivered through Pearson VUE.
- Advanced Addressing and Routing Solutions and Advanced Enterprise Campus Networks each carry 25% of the exam.
The Short Answer: What ENSLD Stands For
On this site, ENSLD is the shorthand for Designing Cisco Enterprise Networks, the Cisco exam coded 300-420. The letters trace back to the exam's naming convention: EN for Enterprise, S for the Specialist-level concentration track, and LD for Design (the exam's lineage comes from Cisco's earlier "Designing Cisco Enterprise Networks" course and exam family). In everyday conversation, engineers use "ENSLD," "300-420," and "the Enterprise Design exam" interchangeably.
The exam is currently published as version 1.1. Cisco's CCNP Enterprise minor update release notes, dated March 19, 2026, retain the v1.1 designation while adding BGP confederations, NSF/NSR, and multicast service-reflection to the scope. That means candidates studying from older notes should confirm they have covered those newer topics.
If you want a quick orientation to the credential itself, our companion pages on what ENSLD is and ENSLD meaning cover the basics from slightly different angles, while this article goes deeper into how the name maps to the exam's actual content.
Decoding the Name: Enterprise Network Design
The word that matters most in the title is Designing. Many Cisco exams test whether you can configure and troubleshoot a feature. ENSLD tests whether you can choose the right architecture, protocol, or service for a given set of business and technical requirements, and justify that choice against alternatives.
What "Enterprise" implies
Enterprise here means campus, branch, WAN, and data center edge networks operated by a single organization, as opposed to service provider networks. The topics reflect that: campus switching and wireless design, SD-Access and traditional LAN architectures, WAN transport selection, and the network services that ride on top of them.
What "Specialist" implies
Passing 300-420 earns the Cisco Certified Specialist - Enterprise Design credential. That is a standalone Specialist certification, and it also counts as the concentration exam for CCNP Enterprise. It is a focused credential, not a replacement for the core exam.
Where 300-420 Sits in the Cisco Certification Path
ENSLD is a concentration exam in the CCNP Enterprise track. The full CCNP Enterprise certification requires two exams: the core exam ENCOR and one concentration exam of your choice. ENSLD is one of the available concentrations, alongside others that emphasize implementation, wireless, automation, or advanced routing.
| Component | Role in CCNP Enterprise | What You Earn |
|---|---|---|
| ENCOR (core exam) | Required for CCNP Enterprise | Contributes to the full CCNP Enterprise certification |
| ENSLD 300-420 (concentration) | Satisfies the concentration requirement | Cisco Certified Specialist - Enterprise Design, plus half of the CCNP Enterprise requirement |
Because there are no formal prerequisites for the exam, you can take 300-420 before, after, or without ENCOR. Many candidates sit ENCOR first because its foundational routing, switching, and architecture content makes the design questions easier to reason about. Our ENSLD requirements guide covers eligibility in more detail.
Exam Facts at a Glance
| Attribute | Detail |
|---|---|
| Exam name | Designing Cisco Enterprise Networks (ENSLD) |
| Exam code and version | 300-420, v1.1 |
| Issuing body | Cisco |
| Duration | 90 minutes |
| Fee | USD 300 plus applicable tax |
| Delivery partner | Pearson VUE (test center and eligible OnVUE online delivery) |
| Languages | English and Japanese |
| Format | Proctored, closed-book written exam |
| Passing score | Set statistically by Cisco; not published as a fixed percentage |
| Prerequisites | None formally required |
Cisco does not publish a fixed cut score, which is why you will see conflicting numbers on forums. Our pages on the ENSLD passing score and the ENSLD pass rate explain what is and is not known, without inventing figures.
The Five Domains Behind the Acronym
The official objectives divide the exam into five domains that total 100%. Two of them carry the most weight, so they deserve the largest share of your attention.
Domain 1: Advanced Addressing and Routing Solutions (25%)
This domain is about designing IP addressing and routing so the network scales, converges predictably, and stays manageable.
- Designing OSPF, EIGRP, and BGP deployments, including area design, summarization, and filtering decisions
- BGP scaling approaches, including route reflectors and the newer-scope BGP confederations
- Route redistribution risks and how to avoid loops and suboptimal paths
- IPv4 and IPv6 addressing plans that support summarization and growth
Domain 2: Advanced Enterprise Campus Networks (25%)
Campus design covers wired and wireless architectures, from the access layer to the core.
- Layer 2 and Layer 3 access designs, first-hop redundancy, and loop-prevention choices
- Resilience concepts such as NSF/NSR alongside fast convergence mechanisms
- Campus wireless design considerations and fabric-based architectures such as SD-Access
- Selecting designs based on scale, failure domains, and operational model
Domain 3: WAN for Enterprise Networks (20%)
This domain focuses on connecting sites and choosing transport and overlay options.
- Comparing WAN transport options and their effect on resiliency and performance
- SD-WAN design, overlay and underlay considerations, and branch connectivity models
- Internet edge and cloud connectivity trade-offs
Domain 4: Network Services (20%)
Services that run across the infrastructure also appear as design decisions.
- QoS design across campus and WAN, including classification, marking, and queuing strategy
- Multicast design, including the newer-scope multicast service-reflection
- Network management and monitoring considerations that influence design
Domain 5: Automation (10%)
The smallest domain still matters because it tests design-level understanding of programmability.
- Model-driven programmability and when APIs and data models fit a design
- Controller-based management and configuration consistency at scale
For a complete walkthrough of every objective, see our ENSLD exam domains guide. Always cross-check against Cisco's official objectives, since wording and detail can change between releases.
Why "Designing" Changes How You Study
Design questions rarely ask for a command. They present a scenario, such as a growing organization, a set of availability goals, or a migration constraint, and ask which approach best satisfies the requirements. Several answers may be technically valid, and the correct one is the one that fits the stated priorities.
Question habits to practice
- Identify the constraint first. Scale, convergence time, operational simplicity, and cost each point toward different answers.
- Know the trade-off for every protocol and feature. It is not enough to know that route reflectors reduce full-mesh requirements; you should know what they cost in path visibility and how confederations differ.
- Eliminate by requirement mismatch. Wrong answers are often valid technologies applied to the wrong problem.
Who Uses This Credential and What Roles It Supports
The Enterprise Design Specialist credential is most relevant to people who plan, review, or influence network architecture rather than only operate it.
- Network and solutions architects who draft high-level and low-level designs for campus, WAN, and branch environments
- Senior network engineers who evaluate design proposals and lead migrations
- Pre-sales and systems engineers at Cisco partners and resellers who translate customer requirements into proposed topologies
- Consultants and managed-service engineers who assess existing enterprise networks and recommend changes
Employers use Cisco credentials as a signal of structured knowledge, and the Specialist title is visible on its own. Because it also counts toward CCNP Enterprise, it contributes to a broader credential many job postings reference. Salary and job-market data are discussed qualitatively in our ENSLD salary guide and ENSLD jobs page, and our ROI analysis weighs the investment against likely career benefit.
Registration, Fees, and Delivery Mechanics
You schedule the exam through Pearson VUE using your Cisco certification profile. The listed fee is USD 300 plus applicable tax, so the final amount depends on your location. Fee and provider policy details live on Cisco's certification FAQ, and it is worth checking there before you pay, since pricing and taxes can vary. Our ENSLD cost breakdown covers what else to budget for.
Test center or online
You can test at a Pearson VUE test center or, where eligible, through OnVUE online proctoring. Either way, the exam is proctored and closed-book. Cisco's examination policies govern confidentiality, identification, and conduct, so read them before test day. Online delivery has environment requirements, such as a clear workspace and a supported computer setup, that are easy to overlook until check-in.
Timing
You have 90 minutes. Design scenarios can be text-heavy, so pacing matters. Practice reading a scenario, extracting the requirements, and committing to an answer without rereading everything repeatedly. For scheduling windows and deadlines, see ENSLD exam dates.
Sequencing Your Preparation by Domain Weight
Rather than a generic schedule, tie your calendar to the exam blueprint. The two 25% domains are the bulk of your score and also the topics where design trade-offs are densest, so they come first. A sample progression for a candidate with solid CCNA-level knowledge:
Addressing and Routing (25%)
- OSPF, EIGRP, and BGP design decisions, including summarization and scaling
- BGP route reflectors versus confederations, and redistribution pitfalls
Enterprise Campus (25%)
- Access, distribution, and core design models and failure domains
- NSF/NSR, fast convergence, wireless, and SD-Access concepts
WAN (20%)
- Transport comparison, SD-WAN overlay design, and internet edge choices
Network Services and Automation (30% combined)
- QoS and multicast design, including service-reflection
- Programmability and controller-based management at a design level
Full-length review
- Timed scenario practice and review of every missed design rationale
Adjust the length to your background and available hours. Our ENSLD study guide expands on resources, and the ENSLD cheat sheet is useful for last-minute review of trade-offs. When you are ready to test your recall under realistic conditions, the ENSLD practice tests let you rehearse the scenario-based style.
Key Takeaway
After each practice question, write one sentence explaining why the wrong options fail the stated requirement. That habit builds the elimination skill design exams reward more than raw memorization.
What Happens After You Pass
Passing grants the Cisco Certified Specialist - Enterprise Design credential, which 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 follows a three-year cycle, with an 80-CE requirement.
Renewal activities and qualifying options are published by Cisco and can include exams, training, and other approved activities. Check Cisco's recertification and continuing education pages for what currently qualifies, since the list is maintained by Cisco and may change.
If your goal is the full CCNP Enterprise, remember that ENSLD is only half the equation: you still need ENCOR. For a broader view of the credential and what it represents, see our pages on ENSLD certification and what ENSLD certification is.
Frequently Asked Questions
ENSLD is the common shorthand for Designing Cisco Enterprise Networks, Cisco exam 300-420. The name reflects its focus on enterprise network design within the CCNP Enterprise track.
No. ENSLD is a concentration exam that earns the Cisco Certified Specialist - Enterprise Design credential. Full CCNP Enterprise also requires passing the ENCOR core exam.
No formal prerequisites exist. You may take ENSLD before or after ENCOR, though many candidates find ENCOR's foundation helpful for design reasoning.
The exam costs USD 300 plus applicable tax and runs 90 minutes. It is delivered through Pearson VUE at test centers or via eligible OnVUE online proctoring.
The Specialist award is valid for three years and can be renewed with 40 CE credits earned before expiry. CCNP Enterprise has its own three-year cycle with an 80-CE requirement.
In short, ENSLD is Cisco's Enterprise Design exam, and the name tells you what to expect: scenario-driven questions about choosing the right architecture across routing, campus, WAN, services, and automation. Read Cisco's official objectives, pay attention to the March 2026 scope additions, and prepare to justify design decisions rather than recite commands.