EMC E20-020 Online Practice Questions and Exam Preparation

EMC E20-020 Online Questions & Answers

• Question 21:

  What is a challenge that is unique to hybrid cloud deployments for authentication and authorization systems?

  A. Maintaining administrative user credential security
  B. Additional requirements for single sign-on capabilities
  C. Additional costs of scaling authentication server management
  D. Maintaining authentication availability during an inter-cloud link outage
  B. Additional requirements for single sign-on capabilities

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  Single Sign On The advantage of having a single point of control over users' access to any organizational assets should be clear. Extending centralized authentication policy to cloud resources provides not only continuity of control but also maximizes user convenience so that the user need not provide different credentials based on the location of the resource. This will be particularly important as resources migrate to the cloud over time. References: https://technet.microsoft.com/en-us/magazine/hh389788.aspx

• Question 22:

  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?

  A. High CPU core count and high memory capacity
  B. High CPU core count and moderate memory capacity
  C. Moderate CPU core count and moderate memory capacity
  D. Moderate CPU core count and high memory capacity
  C. Moderate CPU core count and moderate memory capacity

• Question 23:

  An organization wants to include performance monitoring in their cloud environment. However, they want to minimize the number of accounts and passwords that must be created on target devices and sent across the network.

  Which monitoring solution should a cloud architect recommend to meet this requirement?

  A. Proxy
  B. Agent-based
  C. Agentless
  D. Central
  D. Central

• Question 24:

  An organization wants to enable consumers to deploy IaaS and PaaS instances from a service catalog. These instances will all be deployed on a specific hypervisor. The organization has informed you that they want to use a preferred server vendor when building their new private cloud. What must be confirmed about the design?

  A. Server hardware is compatible with PaaS solution
  B. Server hardware is on the hypervisor vendor's compatibility list
  C. Server hardware is supported by the service catalog solution
  D. IaaS instances have the compatible drivers for the physical server hardware
  D. IaaS instances have the compatible drivers for the physical server hardware

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  Explanation: Section: (none)

• Question 25:

  A cloud design contains multiple hosts that are running a hypervisor. Each host has only two physical 10 Gb network adapters that are aggregated for bandwidth and failover. The physical switch ports for each host are configured as access ports. Each host will support numerous virtual machines and network segments. These virtual machines will communicate with other virtual machines on the same network segments. Why would overlay networks be required for this design?

  A. Support for more than two virtual switches
  B. Support for more than one virtual segment
  C. Support for more than two virtual machines
  D. Support for more than one distributed virtual switch
  B. Support for more than one virtual segment

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  An overlay network is a computer network that is built on top of another network. Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Virtual overlay networks use tunneling protocols to extend isolated network segments between servers for multi-tenant data center networks. References: http://searchsdn.techtarget.com/tip/Virtual-overlay-networks-Tunneling- protocolsenable-multi-tenancy

• Question 26:

  A cloud architect is evaluating an organization's need to support thousands of virtual machine instances and some form of encryption. Which encryption type should be selected and why?

  A. Storage array encryption to provide centralized management
  B. Full file systems encryption to simplify key management
  C. Network-based encryption to increase security at the cost of server overhead
  D. Self-encrypting storage devices to increase security at the cost of increased overhead
  B. Full file systems encryption to simplify key management

• Question 27:

  An organization plans to deploy many cloud-native applications that will generate a considerable amount of east-west traffic. The cloud-native applications will be deployed on hosts running hyppervisors. Why would distributed routers be considered in this design?

  A. Enable network segment
  B. Improve network performance between hosts
  C. Minimize Internet traffic
  D. Protect against a physical router failure
  B. Improve network performance between hosts

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  Distributed Virtual Router (DVR) aims to isolate the failure domain of the traditional network node and to optimize network traffic by eliminating the centralized L3 agent. It does that by moving most of the routing previously performed on the network node to the compute nodes.

  * East/west traffic (Traffic between different networks in the same tenant, for example between different tiers of your app) previously all went through one of your network nodes whereas with DVR it will bypass the network node, going directly between the compute nodes hosting the VMs. Etc. References: http://assafmuller.com/2015/04/15/distributed- virtual-routing-overview-and-eastwest-routing/

• Question 28:

  An organization wants to provide backup services in the cloud. They have no backup infrastructure in place. The organization has concerns about losing data if a site disaster occurs. They want to maintain control of backup data placement because of data privacy laws. Finally, they want to maintain at least one month's worth of backups onsite.

  Which backup solution will meet these requirements?

  A. Local backup
  B. Remote backups
  C. Local backup with replication
  D. Local backups with cloud gateway
  D. Local backups with cloud gateway

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  Cloud gateway allows EMC customers to move on-premise data from EMC arrays to public cloud storage providers. Clod gateway facilitate data migration from on-premises to a public cloud storage service to create a true hybrid cloud storage environment. Cloud gateways such as Riverbed's SteelStore (formally known as Whitewater) can act as a local backup target for funneling data to a storage cloud for offsite storage. References: http://blogs.forrester.com/ henry_baltazar/14-07-09- gateways_will_accelerate_data_migration_to_the_cloud

• Question 29:

  Which authentication and authorization feature is critical for service providers when supporting multi-tenancy?

  A. Integration with external authentication services
  B. Integration with external directory services
  C. Portal authentication services
  D. Single sign-on capability
  A. Integration with external authentication services

• Question 30:

  An organization wants to deploy cloud applications using block storage. The architect has included a hyperscale storage solution in the cloud design. Which requirements led to including this solution in the design?

  A. Organization wants to purchase a storage array Organization will use a full mesh topology to combine storage and application processing
  B. Organization wants to purchase a storage array Organization will use a spine/leaf topology to combine storage and application processing
  C. Organization wants to purchase a storage array Organization wants to keep storage processing separate from the application processing
  D. Organization does not want to purchase a storage array Organization wants to use a full mesh topology to combine storage and application processing
  B. Organization wants to purchase a storage array Organization will use a spine/leaf topology to combine storage and application processing

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  When customers want converged/hyper-converged infrastructure appliances (or rack scale systems) - what customers ask for is this:

  They want a management and orchestration stack that spans the domains of compute/storage/virtualization (in appliances), and this extends to the top-of-rack network and spine/leaf network (in rack-scale systems that must scale to and

  beyond rack boundaries operationally).

  Note: Hyperscale storage is the storage of vast quantities of information in media capable of increasing in size rapidly, efficiently, and indefinitely. In a data center, hyperscale storage capacity commonly runs into the petabytes.

  References:http://virtualgeek.typepad.com/virtual_geek/page/4/