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The Cisco 300-420 exam is one of the requirements for the CCNP Enterprise certificate. Since candidates can choose their certification path according to their area of interest, those aiming to design Cisco enterprise networks should choose to take 300-420 test for sure. It validates one's ability to successfully handle different networks, perform advanced routing and addressing, work with WAN, ensure security, and many more.

WAN for Enterprise Networks

This topic focuses on 20% of the overall content and validates the applicants’ competence in the following areas:

• Designing site-to-site VPN, such as DMVPN, MPLS L3 VPN, L2 VPN, IPsec, GET VPN & GRE;
• Explaining the architecture for Cisco SD-WAN, including management plane orchestration plan, data plane, security, control plane, provisioning, and on-boarding;
• Comparing the connectivity options for WAN, including MPLS L3 VPN, L2 VPN, 4G/5G, DWDM, Metro Ethernet, and SD-WAN customer edge;
• Explaining the design considerations for Cisco SD-WAN (LAN design, control plane design, overlay design, scalability, redundancy, high availability, security design, multicast & QoS over the SD-WAN fabric).
• Designing high availability for enterprise WAN, covering failover, multihomed, backup connectivity, as well as single-homed;

Reference: https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/ensld-300-420.html