Cisco CCNP Designing Enterprise Networks (300-420 ENSLD) v1.1

Many enterprise networks grow one project at a time: a WAN circuit here, a cloud connection there, a campus refresh with no shared design standard. The result is fragile redundancy, inconsistent routing and QoS, and too much reliance on a few senior engineers or outside contractors when the network has to change.

Role fit: This course is built for experienced network engineers, typically with 5–10 years in enterprise routing, campus, and WAN work, who are moving from implementation into design roles. It is not an entry-level course. Team Leads should assign it to staff who already configure OSPF, EIGRP, or BGP and now need to make architecture decisions.

Time investment: Plan for about 30 hours across 29 skills. Each skill runs about 45–85 minutes, so learners can work through it in focused weekly blocks without stepping away from operations.

What changes for your team: Instruction focuses on design tradeoffs rather than memorized configurations. Examples include hierarchical campus design decisions, collapsed core and distribution models, large-scale Layer 3 routing considerations, and SD-WAN overlay, control plane, LAN, security, QoS, multicast, and redundancy design. Automation coverage connects network design to model-driven operations, including gRPC and gNMI concepts that can help teams standardize changes and reduce piecemeal CLI errors.

Support: Review quizzes at the end of each skill help learners find knowledge gaps before preparing for the 300-420 ENSLD exam toward CCNP Enterprise.

IT teams complete this training to make network design decisions with confidence, not guesswork. Instead of memorizing configurations, engineers work through the trade-offs a Team Lead or architect weighs when building campus, WAN, and cloud-connected networks that stay up in a mission-critical environment.

• Fewer campus outages from Layer 2 failures: Engineers learn to plan Spanning Tree behavior on purpose, including root priority and path costs, and align STP roots with FHRP active gateways. The focus is on reducing the chance that one local Layer 2 issue ripples through the wider campus.
• Designs your team can support over time: The course shows how to compare first-hop redundancy options such as HSRP, VRRP, and GLBP, and how to weigh advanced features against simplicity. The result is designs your operations staff can troubleshoot without escalation.
• Resilient WAN and SD-WAN for critical applications: Teams practice routing across redundant WANs, including administrative distance tuning and BGP options, and Cisco SD-WAN choices such as application pinning and application-aware SLAs. The goal is to keep services like voice over IP running during a circuit failure.
• Safer, more observable change management: Engineers see why piecemeal CLI changes can leave devices half-configured when one typo slips in. They learn how NETCONF and REST-based operations support more reliable automation and better operational visibility.

For the IT Director, the payoff is a team that can justify its design choices. Engineers who complete the course can explain IGP, BGP, QoS, multicast, and cloud connectivity decisions to stakeholders instead of defaulting to vendor defaults or outside contractors.

Knowledge

• How IS-IS levels, areas, and NET addressing, EIGRP's feasibility condition, and OSPF summarization and authentication support secure, stable, scalable IGP designs
• How BGP address families, iBGP multi-hop peering, scalability techniques, and the best path algorithm shape enterprise routing decisions
• Campus high-availability tradeoffs, including FHRP feature-versus-simplicity choices, Spanning Tree design considerations, and redundancy planning
• SD-Access fabric components, including underlay, overlay, border nodes, and control plane nodes, plus Cisco SD-WAN architecture, planes of operation, and policy design
• QoS strategy, multicast routing, and automation and telemetry concepts for enterprise network design
• Cloud deployment models and connectivity considerations, including chargeback and self-provisioning

Ability

• Build IPv4 and IPv6 addressing schemes against real design constraints and choose an IPv6 migration strategy
• Select and design an IGP or BGP architecture, including routing across redundant WANs with administrative distance tuning or BGP
• Design hierarchical campus L2 and multicampus L3 infrastructures for resilient gateway placement and predictable failover
• Design SD-Access fabrics for multiple sites and Cisco SD-WAN overlays with redundancy, security, QoS, and multicast in mind
• Compare WAN connectivity and site-to-site VPN options and design end-to-end QoS policy
• Evaluate automation and telemetry approaches for a network design