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Cisco 300-420 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Security Services10%- Security architecture design
  • 1. Threat defense integration
    • 2. Network segmentation
      - Secure connectivity
      Topic 2: WAN for Enterprise Networks20%- WAN connectivity options
      • 1. MPLS, Metro Ethernet, 4G/5G
        • 2. SD-WAN architecture and design
          - VPN design
          • 1. Site-to-site VPN
            • 2. DMVPN, L2VPN, L3VPN
              - WAN resiliency and high availability
              Topic 3: Software-Defined Access (SDA)5%- Control plane and data plane design
              - SD-Access architecture
              - Fabric design and deployment
              Topic 4: Advanced Enterprise Campus Networks25%- Layer 3 campus design
              • 1. Routing in campus infrastructure
                • 2. Virtualization and segmentation
                  - Layer 2 campus design
                  • 1. VLAN and trunking design
                    • 2. Hierarchical architecture
                      • 3. Spanning Tree Protocol optimization
                        - Wireless integration
                        Topic 5: Advanced Addressing and Routing Solutions25%- Routing protocol design
                        • 1. OSPF design
                          • 2. Route redistribution and filtering
                            • 3. IS-IS design
                              • 4. EIGRP design
                                - IPv4 and IPv6 addressing design
                                • 1. Structured addressing plans
                                  • 2. Route summarization and aggregation
                                    Topic 6: Network Services15%- Quality of Service (QoS)
                                    • 1. Policing, shaping, congestion management
                                      • 2. Classification and marking
                                        - IP services
                                        • 1. DHCP, DNS, NAT
                                          - Multicast design

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q229-Q234):

                                          NEW QUESTION # 229
                                          A company must automate a set of complex changes aligned with DR testing in the network.
                                          These changes are specific, and the DR playbook will be adjusted in the future. The playbook has diverse routing and switching assets in scope as well as multiple vendor and hardware platforms.
                                          A developer will create a thin, web front-end microservice and integrate with an Open daylight controller to push changes to the network. Which YANG model should be used?

                                          Answer: B


                                          NEW QUESTION # 230
                                          During the integration of ISE and DNA Center, which of the following are used to establish trust through ISE?

                                          Answer: B


                                          NEW QUESTION # 231
                                          An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications:
                                          * IP address 10.10.10.10/27 configured on the interface GigabitEthernet2/1/0
                                          * connectivity from a directly connected host 10.10.10.1/27
                                          Which YANG data model set must the engineer choose?

                                          Answer: D

                                          Explanation:
                                          The correct model set is the one that configures the IOS XE interface GigabitEthernet2/1/0 with IPv4 address
                                          10.10.10.10 and prefix length 27 using valid XML according to the selected YANG schema. The directly connected host address 10.10.10.1/27 confirms the subnet relationship; both addresses belong to 10.10.10.0
                                          /27, so the interface configuration must use that prefix length rather than a host mask or an unrelated network.
                                          YANG-based configuration is strict: the namespace, container hierarchy, interface type, interface name, and address fields must match the device model. If an option places GigabitEthernet under the wrong container, represents the mask incorrectly, or uses a schema from a different model family, the device will reject the payload or configure the wrong object. Option D correctly represents the IOS XE XML structure and the required addressing. In real operations, the engineer should follow this with a get-config readback against the running datastore to prove that the structured configuration committed as intended. Reference topics: IOS XE interface YANG, XML payload structure, NETCONF configuration, IPv4 subnet validation.


                                          NEW QUESTION # 232
                                          Which function do reverse path forwarding mechanisms perform in a multicast deployment?

                                          Answer: D

                                          Explanation:
                                          Reverse Path Forwarding prevents multicast loops and duplicate packet forwarding. Multicast routing is source-oriented, so a router must verify that multicast traffic arrives on the interface it would use to reach the source or rendezvous point, depending on the tree state. If the packet arrives on the expected reverse-path interface, the RPF check succeeds and the router can forward the packet to the outgoing interface list. If it arrives on the wrong interface, the packet is dropped because accepting it could create a loop or duplicate stream. Cisco multicast designs rely on RPF checks with PIM to maintain loop-free distribution trees across redundant routed topologies. RPF does not notify upstream routers by itself, does not eliminate overlapping multicast group addresses, and is not simply a prune-generation mechanism. Prune behavior can occur as part of PIM tree maintenance, but the function asked here is loop prevention. Reference topics: multicast RPF check, PIM forwarding, source tree, shared tree, outgoing interface list, duplicate suppression.


                                          NEW QUESTION # 233
                                          A client is moving to Model-Driven Telemetry and requires periodic updates. What must the network architect consider with this design?

                                          Answer: C

                                          Explanation:
                                          Periodic updates contain a full copy of the subscribed data element or table for all supported transport protocols.
                                          https://www.cisco.com/c/en/us/td/docs/ios-
                                          xml/ios/prog/configuration/166/b_166_programmability_cg/model_driven_telemetry.html


                                          NEW QUESTION # 234
                                          ......

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