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Cisco 300-420 Exam Syllabus Topics:

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

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q225-Q230):

                                          NEW QUESTION # 225
                                          An engineer is designing an EIGRP network for a small branch site where there is only one Layer 3 router. The engineer wants the router to advertise the local LAN network to remote EIGRP neighbors without sending any unnecessary multicast messages on the local LAN. Which action should the engineer take?

                                          Answer: B


                                          NEW QUESTION # 226
                                          An engineer is designing a BGP network for a large customer. To permit efficient scaling, the BGP domain is split into clusters. Which peering solution should be used between the route reflectors in different clusters for the BGP routes to be propagated appropriately?

                                          Answer: D

                                          Explanation:
                                          When configure multi-cluster of BGP RRs, RRs should peer with each RR as non-client according to CCIE routing TCP/IP volumn 2 @2001 page 127
                                          - if the route was learned from nonclient IBGP peer, it is reflected to client only (here RR's route learnt from other RRs is able to reflect to its client)
                                          - if the route was learned from a client, it is reflected to all nonclients and clients, except for the originating client. (routes learnt within the cluster can reflect to nonclient, RR)
                                          - it the route was learnt from an EBGP peer, it is reflected to all nonclients and clients.


                                          NEW QUESTION # 227
                                          A customer requested that a guaranteed service line be enabled for a manufacturing business in different countries. On the customer side, the QoS-aware application is used to process large data chunks. The application cannot tolerate drops and latency should be as low as possible.
                                          Which QoS model must an engineer employ to use the minimum required resources on the ISP network nodes?

                                          Answer: B

                                          Explanation:
                                          A domain-based QoS strategy with Per-Hop Behavior (PHB) is the best fit for guaranteeing a service line with low latency and no packet drops for an application that processes large data chunks. PHB ensures that traffic is classified and treated with consistent behavior across each node in the ISP network. This approach minimizes latency, avoids packet drops, and uses only the necessary resources, optimizing efficiency. It aligns with the requirement to provide high- quality service while conserving ISP network resources.


                                          NEW QUESTION # 228
                                          What is a challenge of the SaaS model?

                                          Answer: A

                                          Explanation:
                                          A major SaaS challenge is the lack of direct application and infrastructure control. With Software as a Service, the provider operates the application stack, platform, upgrades, and supporting infrastructure. The customer benefits from reduced maintenance burden and lower initial deployment cost, but gives up much of the direct control normally available with on-premises applications. This affects troubleshooting, change windows, performance visibility, customization, data residency controls, and integration with existing enterprise systems. Higher initial costs are usually not a SaaS characteristic; SaaS commonly shifts spending toward subscription operating expense. Client computer upgrades are not normally required in the same way as thick-client enterprise software. Data and application integration can be complex, but the option that best captures the core architectural challenge is reduced control over the application and infrastructure. Network architects must account for this by designing secure direct internet access, cloud monitoring, identity integration, and reliable paths to SaaS providers. Reference topics: SaaS architecture, cloud application control, enterprise cloud access, operational visibility, SD-WAN SaaS design.


                                          NEW QUESTION # 229
                                          Refer to the exhibit.

                                          A customer is running HSRP on the core routers. Over time the company has grown and requires more network capacity. In the current environment, some of the downstream interfaces are almost fully utilized, but others are not. Which solution improves the situation?

                                          Answer: D


                                          NEW QUESTION # 230
                                          ......

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