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Passing the Cisco 300-420 Exam is a prerequisite for obtaining the Cisco Certified Design Expert (CCDE) certification. Designing Cisco Enterprise Networks certification is highly valued in the industry and indicates that the holder has a deep understanding of network design principles and can design and implement complex networking solutions.

Cisco 300-420 certification exam is a challenging test that requires a significant amount of preparation and study. Candidates must have a solid understanding of Cisco enterprise network design principles, concepts, and best practices. They must also have a deep understanding of the latest networking technologies and trends, including software-defined networking (SDN), network automation, and network programmability.

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Cisco 300-420 exam is a certification exam that tests the knowledge and skills required to design and implement Cisco enterprise networks. 300-420 exam is intended for network professionals who are responsible for designing and implementing enterprise networks using Cisco technologies. 300-420 Exam is a comprehensive test of the candidate's understanding of network design principles, protocols, and technologies.

Cisco Designing Cisco Enterprise Networks Sample Questions (Q89-Q94):

NEW QUESTION # 89
Which design achieves SD-WAN control plane redundancy?

Answer: D

Explanation:
SD-WAN control plane redundancy can be achieved by using multiple instances of the vManage management system in clusters. Clustering vManage instances provides high availability and redundancy for the control plane, ensuring that if one vManage instance fails, another can take over without service interruption.


NEW QUESTION # 90

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

Explanation:
The design goal is to reduce the impact of branch and remote-office instability while using the fewest possible ABRs. In OSPF, topology changes inside an area trigger SPF calculations for routers in that area. Creating separate areas behind aggregation points contains those changes and prevents every branch link flap from affecting the entire backbone. The minimal-ABR approach is to place the area boundary at the higher aggregation layer, where fewer routers connect the new areas to area 0. In the described topology, R5 and R6 can serve as ABRs for both sets of downstream aggregation connections. That supports a new area for the R1
/R2 branch connections with R5 and R6 as ABRs, and a new area for the R3/R4 remote-office connections with R5 and R6 as ABRs. Making R1, R2, R3, and R4 the ABRs increases the ABR count and spreads area- boundary functions deeper into the network. A single new area for all downstream connections would reduce isolation between different failure domains. The selected design improves stability and keeps the OSPF hierarchy clean.


NEW QUESTION # 91
An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?

Answer: D

Explanation:
The best allocation is to give each branch adjacent /24 prefixes from the 10.0.0.0/8 private range, using one
/24 for data and the next contiguous /24 for voice. Each /24 provides 254 usable host addresses, which satisfies the requirement for up to 128 hosts. More importantly, pairing two contiguous /24s creates a clean
/23 summary per branch. For example, 10.0.0.0/24 for data and 10.0.1.0/24 for voice summarize as 10.0.0.0
/23; the next branch can use 10.0.2.0/24 and 10.0.3.0/24 summarized as 10.0.2.0/23. This pattern supports aggregation and keeps the security team's identification simple because voice prefixes can consistently use the odd-numbered third octet. Option C uses /25 prefixes, but /25 provides only 126 usable addresses, which fails a strict requirement for up to 128 hosts if the subnet and broadcast addresses are excluded. Separate
172.16 ranges reduce per-site summarization clarity. Reference topics: RFC 1918 addressing, VLSM, route summarization, branch addressing design, data and voice prefix allocation.


NEW QUESTION # 92

Refer to the exhibit. An architect must create a stable and scalable EIGRP solution for a customer. The design must:
*conserve bandwidth, memory, and CPU processing
*prevent suboptimal routing
*avoid any unnecessary queries
Which two solutions must the architect select? (Choose two.)

Answer: B,D

Explanation:
Route summarization and EIGRP stub routing are the two correct design techniques for a stable and scalable EIGRP deployment. Summarization reduces the number of prefixes advertised upstream, conserves bandwidth and memory, hides route flaps behind the summary boundary, and reduces the size of the EIGRP topology table. Stub routing prevents branch or access devices from being used as transit routers and limits the scope of EIGRP queries. This is critical because uncontrolled EIGRP query propagation can increase convergence time and processing load, especially in larger hierarchical networks. Prefix lists and distribute lists can filter routes, but filtering alone does not provide the same query-boundary and topology-hiding benefits as summarization and stubs. Static redistribution increases complexity and can create loop or policy risks if not controlled with tags and metrics. The question specifically asks to conserve bandwidth, memory, and CPU, prevent suboptimal routing, and avoid unnecessary queries; summarization and stub routing are the direct Cisco design answers. The architect should summarize at hierarchy boundaries and configure access or branch routers as EIGRP stubs where they should not provide transit. Reference topics: EIGRP summarization, EIGRP stub routing, query scope, hierarchical routing.


NEW QUESTION # 93
Refer to the exhibit.

EIGRP has been configured on all links. The spoke nodes have been configured as EIGRP stubs, and the WAN links to R3 have higher bandwidth and lower delay than the links to R4. When a link failure occurs at the R1-R2 link, what happens to traffic on R1 that is destined for a subnet attached to R2?

Answer: B


NEW QUESTION # 94
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