總結挑戰 · Summary Challenge

Which three options represent characteristics of a resilient network? (Choose three.)下列哪三個選項代表韌性網路的特性？（選三項。）

link congestions鏈路壅塞small failure domains較小的故障網域low latency低延遲short downtime短停機時間redundancy of links and devices鏈路與裝置的備援

You are asked to design a small LAN. You decide to follow the three-tier architecture model, and your goal is to build a secure network. Which statement is true?你被要求設計一個小型 LAN。你決定採用三層式架構模型，目標是建置一個安全的網路。下列哪一項敘述正確？

Security features should be implemented only in the distribution layer devices.安全功能應僅在分佈層裝置上實作。Security features should be implemented only in the core layer devices.安全功能應僅在核心層裝置上實作。Security features should be implemented in the distribution and core layer devices.安全功能應在分佈層與核心層裝置上實作。Security features should be implemented in all three layers, access, distribution and core.安全功能應在存取層、分佈層與核心層這三層全部實作。Security features should be implemented only in the access layer devices.安全功能應僅在存取層裝置上實作。Security features should be implemented in the access and distribution layer devices.安全功能應在存取層與分佈層裝置上實作。

Data center monitoring shows increased loads on the aggregation links from leaf switches to spine switches. To avoid congesting the links, you decide to expand the topology. Which action would be the most appropriate to make?資料中心監控顯示，從葉交換器到骨幹交換器的聚合鏈路負載增加。為避免鏈路壅塞，你決定擴充拓樸。哪一項行動最為恰當？

To mitigate congestion of aggregation links, you add a leaf switch to the network.為減輕聚合鏈路的壅塞，你在網路中新增一台葉交換器。To mitigate congestion of aggregation links, you throttle the bandwidth available to servers.為減輕聚合鏈路的壅塞，你限制伺服器可用的頻寬。To mitigate congestion of aggregation links, you add a spine switch to the network.為減輕聚合鏈路的壅塞，你在網路中新增一台骨幹交換器。To mitigate congestion of aggregation links, you increase the capacity of the links connecting servers to the leaf switches.為減輕聚合鏈路的壅塞，你增加連接伺服器與葉交換器之鏈路的容量。

What is the main benefit of spine-leaf architecture?骨幹葉狀（spine-leaf）架構的主要優點是什麼？

It is typically used in any environment (service provider, enterprise, and data center).它通常可用於任何環境（服務供應商、企業與資料中心）。It is optimized for north-south traffic.它針對南北向流量做了最佳化。It is very flexible because end devices can connect to both leaves and spines.由於終端裝置可同時連接到葉交換器與骨幹交換器，因此非常有彈性。It is a very scalable design.這是一種非常可擴充的設計。

Which statement correctly describes roles and characteristics of network device functional planes?下列哪一項敘述正確描述了網路裝置功能平面的角色與特性？

The control plane only handles traffic sent to the IP addresses of the device itself.控制平面只處理傳送給裝置本身 IP 位址的流量。The control and management planes influence how the data plane forwards traffic.控制平面與管理平面會影響資料平面轉送流量的方式。The management plane traffic never crosses the data plane.管理平面的流量永遠不會通過資料平面。The data plane only forwards signals among physical interfaces. It does not create data structures nor perform lookups.資料平面只在實體介面之間轉送訊號，不會建立資料結構，也不會執行查詢。

A customer would like to lease a data center from your company for their new video game development. Which service should you offer to your customer?有客戶想向你的公司租用資料中心，用於開發他們的新電玩遊戲。你應該提供哪一種服務給客戶？

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Which three options represent benefits of virtualization? (Choose three.)下列哪三個選項代表虛擬化的優點？（選三項。）

With virtualization, fewer total resources are used at the same load across several servers.透過虛擬化，在多台伺服器上以相同負載運作時，所使用的總資源較少。Virtualization requires less expertise from IT staff.虛擬化需要較少的 IT 人員專業知識。Virtualization enables better resource management and better utilization of resources.虛擬化能實現更好的資源管理，並提升資源利用率。With virtualization, fewer guest operating system problems with unsupported hardware are encountered.透過虛擬化，較不會遇到客體作業系統因硬體不受支援而產生的問題。With virtualization, it is easier to replace physical hardware even in case of one physical host.透過虛擬化，即使是單一實體主機的情況，也更容易更換實體硬體。With virtualization, VMs can be easily reproduced on another physical host.透過虛擬化，VM 可輕鬆複製到另一台實體主機上。With virtualization, the operating system within a VM (the guest operating system) is completely independent from host’s physical hardware resources.透過虛擬化，VM 內的作業系統（即客體作業系統）完全獨立於主機的實體硬體資源。

Summary Challenge總結挑戰