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Cisco 300-420 Exam Syllabus Topics:

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

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q123-Q128):

                                          NEW QUESTION # 123
                                          Refer to the exhibit. An engineer must ensure that the QoS design guarantees bandwidth for the applications, and an application can request a particular type of service to support its delay requirements. Which solution must the engineer select?

                                          Answer: B

                                          Explanation:
                                          The correct solution is IntServ with RSVP. The requirement says the application must be able to request a specific service level and receive guaranteed bandwidth with support for delay requirements. Cisco describes Integrated Services as a QoS model that uses Resource Reservation Protocol to signal per-flow resource requirements across the network. RSVP allows applications or endpoints to request bandwidth and delay treatment; each participating network device can admit or reject the reservation based on available resources.
                                          This is exactly the behavior needed when an application must explicitly request a service profile rather than simply inherit a class marking. DiffServ with DSCP is more scalable, but it only marks traffic and applies class-based per-hop behavior. It does not provide per-flow reservation or allow the application to explicitly reserve resources. DSCP by itself is a marking mechanism, not a reservation protocol. RSVP belongs with IntServ in the classic QoS model. Reference topics: Integrated Services, RSVP, resource reservation, QoS guarantees, delay-sensitive applications.


                                          NEW QUESTION # 124
                                          What is the purpose of an edge node in an SD-Access network fabric?

                                          Answer: B

                                          Explanation:
                                          A fabric edge node in Cisco SD-Access is the access-layer fabric device that connects endpoints to the fabric, applies policy, and registers endpoint reachability with the control plane. Cisco SD-Access design material describes edge nodes as devices that identify and authenticate endpoints, place them into the correct virtual network, and update the fabric control plane with endpoint information. The edge node is also where the anycast Layer 3 gateway commonly resides, allowing consistent gateway behavior across the fabric. Option B describes the control-plane node function, because the control plane maintains endpoint-to-location mappings in the host tracking database. Option C describes a border node, which connects the fabric to external Layer 3 networks. Option D also describes the map-resolver behavior associated with the control plane, not the fabric edge. The purpose of the edge node is therefore endpoint attachment, endpoint detection, policy association, and registration of endpoint information with the control plane so the fabric can forward traffic through the correct overlay path.


                                          NEW QUESTION # 125
                                          An engineer is designing a PIM Anycast RP solution between two data centers. The design must ensure that RP1 in DC1 and RP2 in DC2 inform each other about specific sources that have joined locally. Which solution must the engineer choose?

                                          Answer: B


                                          NEW QUESTION # 126
                                          Which two statements describe source trees in a multicast environment? (Choose two.)

                                          Answer: C,E

                                          Explanation:
                                          Section: Network Services


                                          NEW QUESTION # 127
                                          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: A


                                          NEW QUESTION # 128
                                          ......

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