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Cisco 300-420 Exam Syllabus Topics:

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

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                                          Cisco Designing Cisco Enterprise Networks Sample Questions (Q218-Q223):

                                          NEW QUESTION # 218
                                          An engineer is designing a multicast network for a company specializing in VoD content. Receivers are across the Internet, and for performance reasons, the multicast framework close to the receivers within each AS. For high availability, if the sources in one AS are no longer available, the receivers of that AS must be able to receive the VoD content from sources in another AS. Which feature must the design include?

                                          Answer: C

                                          Explanation:
                                          Explanation
                                          https://learningnetwork.cisco.com/s/question/0D53i00000KsrGrCAJ/rendezvous-point-high-availability-mechan


                                          NEW QUESTION # 219
                                          Refer to the exhibit. The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect optimizes the network to reduce the impact when a link fails. Which solution should the architect include in the design?

                                          Answer: B


                                          NEW QUESTION # 220
                                          A customer's current Layer 2 infrastructure is running Spanning Tree 802.1d, and all configuration changes are manually implemented on each switch. An architect must redesign the Layer 2 domain to achieve these goals:
                                          * reduce the impact of topology changes
                                          * reduce the time spent on network administration
                                          * reduce manual configuration errors
                                          Which two solutions should the architect include in the new design? (Choose two.)

                                          Answer: B,E


                                          NEW QUESTION # 221
                                          Since installing a cisco TelePresence system, the company is experiencing other application having response issues when the system in use. As a result, the company asked an architect to recommend a QoS solution. The customer is currently using a CBWFQ policy to manage traffic on an internet connection with a speed of 100 Mbps. Which link-capacity limit must the architect choose for strict-priority for the real-time traffic?

                                          Answer: C

                                          Explanation:
                                          The strict-priority queue should be limited to approximately 33 Mbps on a 100 Mbps Internet connection.
                                          Cisco QoS design guidance warns that strict priority traffic must be bounded, because excessive priority traffic can starve other queues and cause poor application performance for non-real-time traffic. For voice and interactive video, priority queuing is appropriate, but the priority class should normally be constrained to about one-third of the link capacity in a converged enterprise design. That makes 33 Mbps the best choice for a 100 Mbps link. A 75 Mbps strict-priority allocation is far too high and would leave inadequate bandwidth for routing, signaling, business data, and default traffic. A 50 Mbps allocation still gives real-time media excessive control of the interface. A 25 Mbps allocation may work in some environments but is not the standard upper-limit design answer for strict priority in this Cisco context. The architect should also classify TelePresence accurately, mark traffic consistently, and police the priority queue to protect the WAN.
                                          Reference topics: LLQ, CBWFQ, strict priority limits, TelePresence QoS, WAN congestion management.


                                          NEW QUESTION # 222
                                          A network engineer must design a multicast solution to prevent the spoofing of multicast streams and ensure efficient bandwidth utilization. The network will be merged with another multicast domain in the future, and the merge must require minimum effort. Which two solutions meet the customer requirements? (Choose two.)

                                          Answer: A,C

                                          Explanation:
                                          PIM-SSM with IGMPv3 is the correct multicast design. Source-Specific Multicast requires receivers to identify both the multicast group and the permitted source, normally through IGMPv3 membership reports.
                                          That source-specific join model prevents unauthorized or spoofed sources from injecting traffic into the group because receivers do not simply accept traffic from any source for a group address. It also improves bandwidth efficiency because the network builds forwarding state only for the requested source and group pair, without requiring shared trees or rendezvous point discovery. PIM-SM with MSDP can interconnect multicast domains, but it is built around Any-Source Multicast behavior and does not provide the same source- specific anti-spoofing property. IGMPv2 cannot signal source-specific joins, which is why IGMPv3 is required for SSM. Since the network may merge with another multicast domain later, SSM also reduces integration complexity by avoiding RP and MSDP dependencies. Therefore, PIM-SSM and IGMPv3 meet both the security and efficiency requirements. Reference topics: PIM-SSM, IGMPv3, source-specific joins, multicast security, bandwidth efficiency.


                                          NEW QUESTION # 223
                                          ......

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