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| Section | Objectives |
|---|---|
| Topic 1: WAN and Edge Connectivity Design | - SD-WAN architecture and design considerations - Traditional WAN and internet edge design |
| Topic 2: Security Design in Enterprise Networks | - Segmentation and access control design - VPN and perimeter security architecture |
| Topic 3: Network Services Design | - Multicast and QoS design considerations - Routing protocols design (OSPF, EIGRP, BGP) |
| Topic 4: Enterprise Campus Network Design | - Spine-leaf and hierarchical design models - Campus LAN architecture |
| Topic 5: Network Automation and Programmability | - API-driven network automation concepts - Controller-based networking design |
| Topic 6: Enterprise Network Design Principles | - Scalability and high availability design - Design methodologies and best practices |
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質問 # 98 
Refer to the exhibit. A network engineer must design a BGP solution based on:
* The route reflector must have one or more direct physical connections to the core routers (R3 and R4).
* The route reflector must have full redundancy and avoid a single point of failure.
* R2 to R1 link utilization is 90%. and the remaining links are less than 50% utilized.
Which two solutions must the design Include?(Choose two.)
正解：B、D
質問 # 99
An engineer is designing a Layer 3 campus network running EIGRP between the core, aggregation, and access layers. The access layer switches will be connected to the aggregation layer using Layer 3 copper connections. The engineer wants to improve convergence time for access layer switch failures. Which technique must the design include?
正解：B
解説：
BFD for EIGRP is the strongest design option for improving convergence after access-layer switch or uplink failure on Layer 3 links. EIGRP hello and hold timers can detect failures, but aggressive timer reduction increases control-plane chatter and still may not provide consistent subsecond detection across platforms.
Cisco BFD is specifically designed to provide rapid forwarding-path failure detection for routing protocols, including EIGRP, independent of the routing protocol hello mechanism. On point-to-point Layer 3 uplinks, BFD can notify EIGRP quickly when a neighbor path fails, allowing DUAL to react without waiting for the EIGRP hold timer. Summarization from access to aggregation is useful for query scoping and stability, but it does not directly detect an access switch failure faster. Summarization from core to aggregation has even less relevance to access uplink failure detection. Therefore, the design should enable BFD for EIGRP on the access-layer uplinks, with timer values chosen carefully according to platform capability and operational stability. Reference topics: EIGRP convergence, BFD, routed access, failure detection, DUAL.
質問 # 100
Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?
正解：A
解説：
A Fusion device enables Virtual routing and forwarding (VRF) leaking across SD-Access Fabric domains, and enables host connectivity to shared services, such as DHCP, DNS, NTP, ISE, Cisco DNA Center, Wireless LAN Controllers (WLC) and similar.
質問 # 101
A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single AS.
and auto-summarization Is disabled. Which two actions must the company choose? (Choose two.)
正解：A、E
解説：
The scalable EIGRP hub-and-spoke design should make each spoke a stub router and summarize routes from the spokes toward the hubs. Cisco EIGRP documentation states that stub routing improves network stability, reduces resource utilization, and simplifies branch or edge router configuration. Stub spokes limit the routes they advertise and prevent the hub routers from sending unnecessary queries through remote sites.
Summarizing spoke routes toward the hubs further reduces routing-table size and contains convergence events when a subnet fails behind a spoke. Exchanging all routes between every location would increase memory, CPU, and query scope, which is the opposite of good EIGRP scale design. Summarizing only between the hubs may be useful in a dual-data-center design, but it does not solve the spoke scaling requirement. Splitting the network into two autonomous systems is unnecessary when the requirement states that all locations belong to a single AS. Reference topics: EIGRP hub-and-spoke design, stub routing, route summarization, query scope reduction, branch scale.
質問 # 102
An engineer is designing a WAN solution for a customer with teams in different branch locations that need to communicate. The teams also need to access enterprise applications hosted in the data center and the cloud. The customer also must provide guests with connectivity to the internet only, and the internet gateway is located in the data center. Which solution must the engineer choose?
正解：A
質問 # 103
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