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Dell E20-020 Exam Practice Questions (P. 5)

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Question #21
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?
  1. A
    Virtual machine hardware is on the backup application vendor’s compatibility list
  2. B
    Hypervisor servers’ hardware is on the backup application vendor’s compatibility list
  3. C
    Backup application can be integrated with the selected CMP components
  4. D
    Backup application supports a cloud gateway for accessing the cloud-based virtual machines

Correct Answer:
D
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 #22
What describes the storage categories represented by OpenStack Swift and EMC XtremIO requirements?
  1. A
    Swift = Distributed Object Storage XtremIO = Central Storage
  2. B
    Swift = Central Storage XtremIO = Distributed File Storage
  3. C
    Swift = Distributed Block Storage XtremIO = Distributed Object Storage
  4. D
    Swift = Distributed File Storage

Correct Answer:
A
OpenStack Swift is a globally-distributed object storage with a single namespace thats durable enough for the most demanding private clouds and now brought to you in an easy-to-deploy/scale/manage system.
XtremIO is a flash-based Storage Array.
References:
https://www.swiftstack.com/#testimonial/2
http://www.emc.com/collateral/white-papers/h11752-intro-to-XtremIO-array-wp.pdf

Question #23
A cloud architect has determined that the cloud management infrastructure requires an authentication and PKI environment. In addition, each tenant will require its own authentication and PKI environment.
What describes these separate environments in a cloud design document?
  1. A
    Availability zones
  2. B
    Fault domains
  3. C
    Multi-tenancy
  4. D
    Trust zones

Correct Answer:
C
The term "software multitenancy" refers to a software architecture in which a single instance of software runs on a server and serves multiple tenants. A tenant is a group of users who share a common access with specific privileges to the software instance.
Incorrect:
Not A: Availability zones (AZs) are isolated locations within data center regions from which public cloud services originate and operate.
Not B: A fault domain is a set of hardware components computers, switches, and more that share a single point of failure.
Not D: Zones of trust are a defined area of the system where by by necessity, by the presence of key information assets and by the wider environmental context the connections within the zone are treated as at the same level of trust. This effectively couples the components within that subsystem for security purposes.
References:
https://en.wikipedia.org/wiki/Multitenancy

Question #24
When implementing QoS across a cloud network, how is storage traffic usually prioritized?
  1. A
    Most important
  2. B
    More important than tenant traffic but less important than management traffic
  3. C
    More important than management traffic but less important than tenant traffic
  4. D
    Least improtant

Correct Answer:
C

Question #25
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?
  1. A
    Ensuring the cloud storage provider is using the same compression algorithm as the backup software
  2. B
    Ensuring data is encrypted and key management is defined
  3. C
    Ensuring the cloud storage provider is using the same PKI solution as the organization
  4. D
    Ensuring the backup application supports the same authentication mechanism as the public cloud provider

Correct Answer:
B

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