Pass Guaranteed 2026 Cisco 300-420: Perfect Latest Designing Cisco Enterprise Networks Test Questions

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Cisco 300-420 Exam Syllabus Topics:

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

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q236-Q241):

                                          NEW QUESTION # 236

                                          Refer to the exhibit An engineer working for a telecommunication company with an employee ID 4449:30
                                          959 Is calculating STP scalability for switches to ensure that the numbers are below the maximum supported value for STP logical ports How many logical interfaces are active for switch A?

                                          Answer: A

                                          Explanation:
                                          The active logical interface count for Switch A is 202 based on the spanning-tree scalability method used for logical ports. In STP design, a logical port is counted per active VLAN instance on each active trunk or access interface. A trunk carrying multiple VLANs therefore consumes multiple logical STP ports, while an access link normally consumes one logical STP port for its VLAN. Cisco campus design guidance uses logical-port counts to ensure that the selected STP mode and platform stay within supported scalability limits. The calculation in the exhibit produces 202 active logical interfaces for Switch A, not simply the number of physical links. Answer A counts only physical interfaces and ignores VLAN instances. Answer D is too low because it does not account for all active VLANs across the relevant links. Answer B overstates the count by including VLANs or links that are not active for Switch A. Reference topics: STP scalability, logical ports, VLAN instances, trunk design, Layer 2 campus sizing.


                                          NEW QUESTION # 237
                                          Refer to the exhibit.

                                          An architect is designing a routing solution for a company. The new design will add a circuit routers C and D to protect against loss of connectivity to 10.0.4.0/24 during a link failure between routers B and D. Which solution must the architect choose?

                                          Answer: A


                                          NEW QUESTION # 238
                                          Which method does Cisco SD-WAN use to avoid fragmentation issues?

                                          Answer: C

                                          Explanation:
                                          https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/sd-wan/nb-06-cisco-sd-wan-ebook-cte-en.pdf


                                          NEW QUESTION # 239
                                          Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)

                                          Answer: A,D


                                          NEW QUESTION # 240
                                          What is the purpose of the fabric control plane in a Cisco SD-Access architecture?

                                          Answer: A


                                          NEW QUESTION # 241
                                          ......

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