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EMC E20-020 問題練習

Cloud Infrastructure Specialist Exam for Cloud Architects 試験

最新更新時間: 2019/05/10,合計64問。

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Question No : 1
What is a benefit of a service catalog?

正解:
Explanation:

Question No : 2
An organization is considering the use of a cloud gateway to backup services to a public cloud. They will use their existing backup application.
What is a design consideration?

正解:

Question No : 3
An organization wants to build a pilot cloud for developers to learn and practice cloud-native application design. The organization expects that the cloud will host many tiny instances that will use few resources.
What accurately describes the optimal CPU and memory configuration?

正解:

Question No : 4
An organization wants to deploy applications that can programmatically alter network behavior. In addition, they want to deploy additional network services in real-time.
Which cloud-management component should be included in the design to support this requirement?

正解:
Explanation:
An SDN controller is an application in software-defined networking (SDN) that manages flow control to enable intelligent networking. SDN controllers are based on protocols, such as OpenFlow, that allow servers to tell switches where to send packets. In effect, the SDN controller serves as a sort of operating system (OS) for the network. By taking the control plane off the network hardware and running it as software instead, the controller facilitates automated network management and makes it easier to integrate and administer business applications.
References: http://searchsdn.techtarget.com/definition/SDN-controller-software-defined­networking-controller

Question No : 5
A cloud design contains multiple hosts that are running a hypervisor. Each host has only two physical 10 Gb network adapters. The hosts reside in different subnets but can communicate with each other. Each host will support numerous virtual machines and network segments.
What is needed to support a network segmentation in the current configuration?

正解:
Explanation:
NVGRE (Network Virtualization using Generic Routing Encapsulation) is a network virtualization technology that attempts to alleviate the scalability problems associated with large cloud computing deployments. It uses Generic Routing Encapsulation (GRE) to tunnel layer 2 packets over layer 3 networks. Incorrect: Not C: MLAG is the ability of two and sometimes more switches to act like a single switch when forming link bundles. This allows a host to uplink to two switches for physical diversity, while still only having a single bundle interface to manage.
References: https://en.wikipedia.org/wiki/Network_Virtualization_using_Generic_Routing_Encapsulation

Question No : 6
You are creating a cloud infrastructure design for an organization. The cloud design includes physical servers with hypervisors which will be used to host consumer services. The hosts are managed through a hypervisor element manager.
Which step should be taken to secure the hypervisor environment?

正解:

Question No : 7
During an assessment for an organization’s cloud design, a cloud architect discovers that developers will be creating applications for tenants. The applications will self-scale based on an internal trigger. The architect has included cloud management platform (CMP) components in the design that will support this requirement.
To meet this requirement, what else should the cloud architect consider?

正解:

Question No : 8
An organization plans to deploy a spine/leaf network topology to support a cloud design. Leaf switches will use layer-3 protocols to communicate with the spine switches. Hosts will each connect to two leaf switches using layer-2 protocols.
Which technology must be enabled between the host and leaf switches to provide the maximum throughput for a single data stream?

正解:
Explanation:
Generic Network Virtualization Encapsulation (Geneve) is the peacemaking protocol drafted to unify VXLAN, NVGRE, and whatever other tunneling protocols emerge for network virtualization. Geneve doesn’t exactly replace VXLAN and other protocols. Rather, it provides a common superset among them, so that outside software can provide hooks to Geneve rather than having to accommodate multiple encapsulation standards. Note: NVGRE (Network Virtualization using Generic Routing Encapsulation) is a network virtualization technology that attempts to alleviate the scalability problems associated with large cloud computing deployments. It uses Generic Routing Encapsulation (GRE) to tunnel layer 2 packets over layer 3 networks. Its principal backer is Microsoft.
References: https://www.sdxcentral.com/articles/news/intel-supports-geneve-unify-vxlan­nvgre/2014/09/

Question No : 9
A cloud architect is designing a private cloud for an organization. The organization has no existing backup infrastructure. They want to offer consumers the ability to backup virtual machine instances using image-based backups.
What should the cloud architect look for when selecting a backup application for this environment?

正解:
Explanation:
A cloud storage gateway provides basic protocol translation and simple connectivity to allow the incompatible technologies to communicate transparently. The gateway can make cloud storage appear to be a NAS filer, a block storage array, a backup target or even an extension of the application itself. References: http://searchcloudstorage.techtarget.com/definition/cloud-storage-gateway

Question No : 10
You are creating a cloud infrastructure design for an organization. You learn that, for compliance reasons, the organization needs to maintain a separate set of infrastructures for certain deployed services.
Which part of the design will be impacted by this requirement?

正解:

Question No : 11
Which categories of network traffic should be isolated from inter-host communication and each other?

正解:

Question No : 12
Which type of storage is optimal for high performance and low latency applications?

正解:
Explanation:
Block storage has been king of the hill for performance-centric applications.
References: http://searchcloudstorage.techtarget.com/feature/How-an-object-store-differs­from-file-and-block-storage

Question No : 13
Which aspect of the project definition does the cloud design scope provide?

正解:

Question No : 14
After developing prototype applications in the public cloud, developers determined that they want software defined network functionality.
Which ability will this requirement provide for the developers?

正解:
Explanation:
Software-defined networking (SDN) is an approach to computer networking that allows network administrators to manage network services through abstraction of higher-level functionality. This is done by decoupling the system that makes decisions about where traffic is sent (the control plane) from the underlying systems that forward traffic to the selected destination (the data plane).
Reference: https://en.wikipedia.org/wiki/Software-defined_networking

Question No : 15
Which benefits might be realized by designing a separate infrastructure pool to host network functions?

正解:

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