Free PDF 2026 Cisco Trustable 300-420: Exam Designing Cisco Enterprise Networks Topic

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Cisco 300-420 Exam Syllabus Topics:

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

                                          >> Exam 300-420 Topic <<

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q99-Q104):

                                          NEW QUESTION # 99

                                          Refer to the exhibit. An architect must design a resilient gateway solution based on these requirements:
                                          * VLAN 10 and VLAN 11 support voice and video applications.
                                          * Link and node failures must have minimal impact on traffic.
                                          * Provide protection against false hello packets.
                                          * Support IPv6.
                                          Which solution must the architect choose?

                                          Answer: D


                                          NEW QUESTION # 100
                                          A customer is discussing QoS requirements with a network consultant. The customer has specified that endto-end path verification is a requirement. Which QoS solution meets this requirement?

                                          Answer: C

                                          Explanation:
                                          https://www.cisco.com/en/US/technologies/tk543/tk766/technologies_white_paper09186a00800a
                                          3e2f.html


                                          NEW QUESTION # 101

                                          Refer to the exhibit. A network engineer working for a private service provider with an employee ID: 4670:71:
                                          451 must design a BGP solution based on:
                                          * All traffic originating from AS100 must pass through AS200 to reach the NTP and DHCP server
                                          * When a link failure occurs between R3 and R4, traffic must follow the R2-R9 link to reach the NTP and DHCP server.
                                          Which solution must the design include?

                                          Answer: C

                                          Explanation:
                                          A higher local preference on R3 for the relevant routes is the correct method to influence outbound traffic inside the autonomous system. Local preference is a well-known discretionary BGP attribute used within an AS to choose the preferred exit path. A higher local preference is preferred over a lower one, and the attribute is propagated to iBGP peers so routers in the AS make a consistent outbound decision. The requirement says all traffic originating from AS100 must pass through AS200 toward the NTP and DHCP server, and if the R3- to-R4 link fails, the path must move to the R2-to-R9 link. Applying local preference on R3 toward the routers that need to reach the data center establishes R3 as the primary exit while preserving the alternate path through R2 and R9. AS-path prepending is mainly used to influence inbound traffic from other autonomous systems, not the local AS exit choice. Redistributing IGP metrics into BGP is less deterministic and not the right policy control. Reference topics: BGP local preference, outbound traffic engineering, iBGP policy propagation, primary and backup path design.


                                          NEW QUESTION # 102
                                          Which feature of Cisco SD-WAN Secure Direct Cloud Access divides user traffic into different zones and VPNs or VRFs?

                                          Answer: D

                                          Explanation:
                                          Secure segmentation is the Cisco SD-WAN Secure Direct Cloud Access function that separates user traffic into different zones and VPNs or VRFs. In Cisco SD-WAN, VPNs provide logical segmentation that is comparable to VRF separation in traditional routing. Secure Direct Cloud Access extends this segmentation model when users access internet and cloud applications directly from the branch. The design can keep corporate, guest, payment, voice, IoT, and other traffic classes isolated, with policy and security controls applied per segment or zone. Centralized data policy controls forwarding behavior, but the feature that divides traffic into separate zones and VPN or VRF contexts is secure segmentation. Perimeter control and application-aware routing are useful security and performance functions, but they do not describe the core segmentation mechanism. Segmentation is a fundamental SD-WAN design requirement because direct cloud access must not collapse trust boundaries simply because traffic no longer hairpins through a central data center. Reference topics: Cisco SD-WAN secure segmentation, VPNs, VRFs, direct cloud access, zone-based policy.


                                          NEW QUESTION # 103
                                          Refer to the exhibit.

                                          Refer to the exhibit. All routers currently reside in OSPF area 0. The network manager recently used R1 and R2 as aggregation routers for remote branch locations and R3 and R4 for aggregation routers for remote office locations. The network has since been suffering from outages, which are causing frequent SPF runs. To enhance stability and introduce areas to the OSPF network with the minimal number of ABRs possible, which two solutions should the network manager recommend? (Choose two.)

                                          Answer: A,B


                                          NEW QUESTION # 104
                                          ......

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