ENSLD 300-420 study guide
ENSLD 300-420 · Work through your exam, one topic at a time.
The CCNP Enterprise certification page on Cisco.com describes the CCNP Enterprise as the professional-level certification track within Cisco's Enterprise certification family. The ENSLD 300-420 exam, commonly called Designing Cisco Enterprise Networks, is one of the concentration exams associated with that track. This page is an independent study resource for candidates preparing for ENSLD 300-420. It is not affiliated with, endorsed by, or sponsored by Cisco, and it does not reproduce any commercial question bank. Topics on this exam: Network design fundamentals, Campus and branch network design, WAN and SD-WAN design, and Automation and assurance in network design. The ENSLD 300-420 study guide has 4 sections and about 1,649 words.
01Network Design Fundamentals
Domain 1 - Network Design Fundamentals tests how you turn business requirements into a structured, resilient, addressable design: hierarchical models, redundancy, addressing and summarization, and routing-protocol selection. Cisco designs around four principles - hierarchy, modularity, resiliency, flexibility - delivered through the PPDIOO lifecycle (prepare, plan, design, implement, operate, optimize).
415 words, about 2 min02Campus and Branch Network Design
Domain 2 - Campus and Branch Network Design tests your choice of topology, where the Layer 2/Layer 3 boundary sits, first-hop redundancy, wireless and PoE sizing, and fabric (SD-Access) design. Classic design is access-distribution-core.
421 words, about 2 min03WAN and SD-WAN Design
Domain 3 - WAN and SD-WAN Design is the heaviest weighted area. It tests transport and topology selection, Cisco SD-WAN control and data plane, policy, application-aware routing, and high availability.
406 words, about 2 min04Automation and Assurance in Network Design
Domain 4 - Automation and Assurance in Network Design tests how you design a network that can be provisioned programmatically and observed continuously: model-driven interfaces, day-0 and day-N tooling, telemetry, and assurance platforms. Standardize before automating: consistent hostnames, interface descriptions, addressing, and VLAN numbering, expressed as templates.
407 words, about 2 min