#3 - Become Part of Cisco Community

Cisco is one of the largest networking service providers that has a global presence. This has helped such a company develop a wide community so every 300-420 exam-taker is advised to join it. In all, this community has millions of active certified, aspiring, and in-job professionals. Thus, the exam-takers can seek help from the Cisco community related to any problem, know the latest IT trend, take suggestions from in-service specialists, and share the struggle with fellow test-takers.

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Network Services

The questions from this subject area cover 20% of the entire content and evaluate the candidates’ ability to perform the following operations:

• Design the techniques for network management, such as prioritize network management traffic, in-band versus out-of-band, and segmented management networks;
• Design the policies for end-to-end QoS, including queuing, shaping, policing, marking & classification;
• Design SSM, MSDP, and PIM bi-directional multicast services.
• Explain the concepts of multicast routing (rendezvous points, source trees, shared trees, and RPF);
• Choose the relevant QoS strategies to meet the requirements of customers;

Objectives of 300-420 Test

There are various topics that are included in the exam and they are:

• Automation (10%).
The Automation domain includes things like choosing the correct YANG data model taking current requirements into account; differentiating between IETF, Cisco native YANG models, and Openconfig as well as between RESTCONF and NETCONF; understanding the impact of model-drive telemetry, covering on-change and periodic publications; comparing dial-in and dial-out approaches to model-drive telemetry.
• Advanced Address and Routing Solutions (25%).
This domain mainly focuses on creating structured addressing plans for IPv4 and IPv6; creating scalable, stable, and secure routing designs for IS-IS, EIGRP, OSPF, and BGP, including route filtering, load sharing, address families, path preference attributes, and route reflectors; determining IPv6 migration strategies, involving native, boundaries, and overlay.
• Enterprise Networks and WAN (20%).
This section addresses the following areas: comparison of WAN connectivity options (DWDM, Layer 2 VPN, 4G/5G, Metro Ethernet, etc.); designing site-to-site VPN, including dynamic multipoint VPN, Ipsec, GRE, and others; designing high availability for enterprise WAN (failover, backip connectivity, etc.); Cisco SD-WAN architecture (on-boarding, security, control plane, and more); Cisco SD-WAN design considerations (redundancy, security design, overlay design, and others).
• Advanced Enterprise Campus Networks (25%).
This part of the exam content measures one's skills in designing campus networks for high availability and knowledge of techniques for platform abstraction, graceful restart, etc.; designing campus Layer 2 infrastructures and multicampus Layer 3 ones, including route summarization, VRFs, convergence, etc.; describing SD-Access Architecture as well as SD-Access fabric design for wireless and wired access.
• Network Services (20%).
The last domain focuses on the ability to choose proper QoS strategies, designing network management techniques; designing end-to-end QoS policies covering shaping, queuing, marking, and more; describing multicast routing concepts, and creating multicast services, including MSDP, SSM, and PIM bidirectional.

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

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