ENSLD 3.0 WAN for Enterprise Networks (20%)¶
WAN is a choose and justify domain. Questions give you a business case, such as site count, transport mix, security rules and failure tolerance, and ask which technology or topology fits and why the others do not. You will not configure anything on this exam, but you do need to know what each option gives you and what it costs.
| Objective | Verb | Page |
|---|---|---|
| 3.1 WAN connectivity: Layer 2 VPN, MPLS L3VPN, Metro Ethernet, DWDM, 4G/5G, SD-WAN CE | Choose | WAN Connectivity Options |
| 3.2 Site-to-site VPN: DMVPN, L2VPN, L3VPN, IPsec, GRE, GET VPN | Compare | Site-to-Site VPN Design |
| 3.3 WAN HA: single-homed, multihomed, backup, failover | Design | High Availability for the WAN |
| 3.4 Cisco SD-WAN architecture: planes, onboarding, security | Describe | SD-WAN Architecture |
| 3.5 Cisco SD-WAN design: control plane, overlay, LAN, HA, scale, security, QoS, multicast | Design | SD-WAN Design Considerations |
Time budget: about 10 to 12 hours. See the study plan.
Each page replaces the lab with a Design exercise: a short scenario with requirements and constraints, then a collapsible model answer that names the rejected alternatives. Write your own answer first, then compare.
Related material¶
Mechanics are taught elsewhere in the course. Read them if a term is unfamiliar:
- ENCOR SD-WAN for OMP, TLOCs and the control and data plane elements
- ENCOR GRE and IPsec
- ENARSI DMVPN, DMVPN phases and MPLS Layer 3 VPN
- ENARSI BFD
- ENCOR QoS
When you finish, take the WAN practice questions. Aim for 80% or better before moving on.
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