100% Pass Quiz 2026 Perfect Cisco 300-420: Designing Cisco Enterprise Networks Test Cram Review

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Cisco 300-420 Exam Syllabus Topics:

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

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q174-Q179):

                                          NEW QUESTION # 174
                                          An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?

                                          Answer: B


                                          NEW QUESTION # 175
                                          An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?

                                          Answer: B

                                          Explanation:
                                          Traffic shaping is the QoS mechanism that queues excess packets and transmits them later to conform to a configured rate. In Cisco QoS design, shaping smooths bursts by buffering traffic instead of immediately discarding it when the offered rate exceeds the configured rate. This makes shaping appropriate on egress interfaces where the enterprise router has a higher physical interface speed than the actual provider committed information rate. WRED and RED are congestion-avoidance mechanisms that drop packets probabilistically to prevent full queue exhaustion, especially for TCP traffic. They do not intentionally hold excess packets for later transmission as the primary behavior. Policing enforces a traffic rate by dropping or remarking traffic that exceeds the configured contract; it does not buffer traffic to smooth bursts. Therefore, when the design requirement says excess packets must be queued for later transmission, the mechanism must be shaping. In WAN edge QoS, shaping is often paired with child queuing policies so latency-sensitive and business-critical classes receive correct treatment inside the shaped parent rate.


                                          NEW QUESTION # 176
                                          An engineer is designing a BGP solution supporting a VXLAN environment over a Layer 3 IPv4 network fabric with these requirements
                                          * provide Layer 2 adjacency
                                          * allow VM migration of workloads between sites
                                          * IGP is OSPF
                                          Which BGP address family must the engineer choose?

                                          Answer: D


                                          NEW QUESTION # 177

                                          Refer to the exhibit. An architect must design a solution to connect bank site A with bank site B and support:
                                          * network operation center monitoring end-to-end L3VPN and L2VPN traffic
                                          * company adding thousands of routes in the next two years
                                          Which two BGP solutions must the design include? (Choose two.)

                                          Answer: B,C


                                          NEW QUESTION # 178
                                          Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable. Which solution must the engineer choose?

                                          Answer: B

                                          Explanation:
                                          https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-sham-link.html


                                          NEW QUESTION # 179
                                          ......

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