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Cisco 300-420 Exam Syllabus Topics:

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

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q363-Q368):

                                          NEW QUESTION # 363
                                          Drag and drop the descriptions from the left onto the categories they apply to on the right.

                                          Answer:

                                          Explanation:


                                          NEW QUESTION # 364
                                          Which queuing structure is used on SD-WAN Edge routers?

                                          Answer: B

                                          Explanation:
                                          Cisco SD-WAN edge routers use a queuing model based on LLQ and WFQ concepts. Low Latency Queuing provides strict priority treatment for delay-sensitive traffic such as voice and real-time media, while Weighted Fair Queuing gives proportional service to other traffic classes based on bandwidth allocation. This combination aligns with SD-WAN requirements where business-critical and real-time traffic must be protected without starving normal data applications. FIFO is not appropriate for a multi-class WAN design because it does not distinguish application priority during congestion. A pure priority queue would risk starving lower-priority traffic if it were not controlled by policing or bandwidth limits. Hardware-specific campus queuing models such as 1P-4Q-2T describe certain switch egress queue structures, not the generic SD- WAN edge queuing architecture. In a professional SD-WAN QoS design, traffic is classified, marked, mapped to forwarding classes, and then scheduled using priority and weighted queues according to business intent. Reference topics: Cisco SD-WAN QoS, LLQ, WFQ, forwarding classes, application-aware WAN policy.


                                          NEW QUESTION # 365
                                          Refer to the exhibit. A customer requires a Layer 2 network designed to support:
                                          - 500 active logical ports
                                          - trunking of 30 VLANs
                                          - convergence of less than 1 second
                                          Which Spanning Tree Protocol must be selected?

                                          Answer: C


                                          NEW QUESTION # 366
                                          Which design element should an engineer consider when multicast is included in a Cisco SD- Access architecture?

                                          Answer: B

                                          Explanation:
                                          Multicast traffic is transported in the overlay, in the EID space, for both wired and wireless clients.
                                          https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2018/pdf/BRKEWN-2020.pdf


                                          NEW QUESTION # 367
                                          An enterprise needs to enhance its WAN availability after a recent outage with its only MPLS provider. The proposed solution must have a quick deployment, be affordable, be reliable, and work as a backup for the enterprise's primary MPLS connection. Which solution meets these requirements?

                                          Answer: B

                                          Explanation:
                                          To enhance WAN availability quickly and affordably, while ensuring reliability and acting as a backup for the MPLS connection, contracting an internet connection and deploying DMVPN (Dynamic Multipoint Virtual Private Network) is an ideal solution. DMVPN allows for the creation of secure, scalable, and flexible VPNs over the internet, which can serve as a backup for the primary MPLS link. It offers quick deployment and does not require the enterprise to invest in additional expensive MPLS connections. DMVPN can also work seamlessly with existing infrastructure and is cost-effective compared to adding another MPLS provider.


                                          NEW QUESTION # 368
                                          ......

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