300-420 Real Exam Questions
Designing Cisco Enterprise Networks (ENSLD). Everything you need to prepare, practice, and pass.
421
Questions
6
Exam Domains
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Explanations
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Certification Overview
This exam tests enterprise network design across three pillars: modern architectures (SD-Access for campus, SD-WAN for branches), traditional infrastructure optimization (advanced routing, DMVPN, multicast), and cross-cutting concerns (QoS, security services, automation). Success requires understanding how these components integrate into cohesive enterprise designs, not mastery of individual technologies.
What This Certification Proves
The ENSLD (300-420) validates expertise in designing comprehensive enterprise networks using modern architectures like SD-Access, SD-WAN, and advanced routing solutions. This certification demonstrates the ability to architect scalable, secure, and resilient enterprise network solutions across campus, branch, and WAN environments.
Who Should Take This Exam
Network engineers and architects with 5+ years of hands-on enterprise networking experience, transitioning from implementation roles to design responsibilities. Ideal for those supporting multi-site enterprises and seeking to validate architectural competencies beyond protocol knowledge.
Topic Breakdown
6 domains covering 420 questions
| Domain | Questions | Weight |
|---|---|---|
| Advanced Addressing And Routing Solutions | 153 | 36% |
| Wan For Enterprise Networks | 111 | 26% |
| Advanced Enterprise Campus Networks | 91 | 22% |
| Network Services | 35 | 8% |
| Automation | 28 | 7% |
| Automation And Artificial Intelligence | 2 | 0% |
Study Plans
Choose a study plan that matches your schedule and experience level
30 Days
Intensive Sprint
Week 1-2
- Master fundamentals: Advanced Addressing And Routing Solutions
- Read Cisco official documentation
- Complete 15 questions daily
Week 3
- Deep dive: Wan For Enterprise Networks
- Review weak areas from results
- Take 2 full-length exams
Week 4
- Review all flagged questions
- Timed exams to build stamina
- Final revision of key concepts
60 Days
Balanced Approach
Week 1-2
- Survey all exam domains
- Set up study environment
- Begin with foundational topics
Week 3-4
- Focus: Advanced Addressing And Routing Solutions
- Focus: Wan For Enterprise Networks
- 8 questions daily
Week 5-6
- Focus: Advanced Enterprise Campus Networks
- Hands-on labs if applicable
- Review explanations for wrong answers
Week 7-8
- Complete all 421 questions
- Identify and eliminate weak areas
- Take 3 full-length timed tests
90 Days
Comprehensive Study
Month 1
- Learn all exam domains at a comfortable pace
- Build strong foundational knowledge
- 5 questions daily
Month 2
- Deep dive into each domain
- Hands-on practice and labs
- Take weekly timed exams
Month 3
- Work through all 421 questions
- Identify and eliminate weak areas
- Take 3 full-length timed exams
300-420-Specific Tips
- Master SD-Access and SD-WAN fundamentals first—these dominate the exam and are foundation for other design decisions across domains
- Practice designing multi-domain architectures: combine campus design with WAN and security considerations, not isolated topics
- Study EIGRP route summarization and DMVPN scaling patterns deeply; these appear as design constraints in scenario questions
- Work through multicast routing design scenarios (enterprise video, collaboration); understand bandwidth and RP placement tradeoffs
- Focus on design tradeoffs and justifications, not just 'what is X'—the exam tests why you choose one solution over another
- Use the 423 practice questions to identify weak domains early; this exam requires balanced knowledge across 11 domains, not depth in 2-3
- Review real-world enterprise network design case studies; the exam context often involves constraints (branch locations, legacy systems, compliance) that require practical judgment
Relevant Career Roles
Sample Questions
Try 5 free questions from the 300-420 question bank
Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal. Which design provides optimal routing between both networks when the link between routers C and E fails?
At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?
When a first hop redundancy solution is designed, which protocol ensures that load balancing occurs over multiple routers using a single virtual IP address and multiple virtual MAC addresses?
A customer reports that each time a networking component fails, OSPF recalculates the backup path, with causes a short outage. Which solution must the customer implement to improve this situation?
Refer to the exhibit. A customer is running HSRP on the core routers. Over time the company has grown and requires more network capacity. In the current environment, some of the downstream interfaces are almost fully utilized, but others are not. Which solution improves the situation?
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