Giovanni De Lucia
Quiz by , created more than 1 year ago

Computing Infrastructures Multiple Choiche and True/False quiz collection

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Giovanni De Lucia
Created by Giovanni De Lucia about 1 year ago
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Question 1 of 91

1

In the Microkernel architecture of VMs:

Select one of the following:

  • Drivers are part of the Guest VMs

  • Drivers are part of the Hypervisor

  • Drivers are part of a specific service VM

  • Drivers are part of the Guest OS

Explanation

Question 2 of 91

1

Which statement about Paravirtualization is correct?

Select one of the following:

  • It is the same of Kernel-level Virtualization

  • Guest OS and VMM are independent each other

  • It cannot be used with traditional Operating Systems

  • Hooks are not required

Explanation

Question 3 of 91

1

Which is the goal of the "machine-learning software as a service"?

Select one of the following:

  • Provide networking paradigms for machine learning

  • Provide ready-to-use machine learning applications

  • Provide platform and toolboxes for machine learning

  • Provide hardware infrastructures for machine learning

Explanation

Question 4 of 91

1

An emulator:

Select one of the following:

  • emulates only the ISA but not the ABI

  • emulates only the ABI and not the ISA

  • reproduces the machine by providing not only ABI but ISA (user/ system)

  • supports the Java Runtime Environment

Explanation

Question 5 of 91

1

Does an emulator read, interpret and execute all the bytes included in the memory of system it is going to reproduce?

Select one of the following:

  • True
  • False

Explanation

Question 6 of 91

1

The program in warehouse-scale computing may consist of tens or more individual programs:

Select one of the following:

  • True
  • False

Explanation

Question 7 of 91

1

Data centers are buildings where multiple servers and communication units are co-located

Select one of the following:

  • True
  • False

Explanation

Question 8 of 91

1

What is a computing infrastructure?

Select one of the following:

  • Technological infrastructure that provides hardware and software for computation to other systems and services

  • Technological infrastructure that provides applications to other systems and services

Explanation

Question 9 of 91

1

Tower servers consumes less space than rack and blade:

Select one of the following:

  • True
  • False

Explanation

Question 10 of 91

1

Blade servers require expensive configurations:

Select one of the following:

  • True
  • False

Explanation

Question 11 of 91

1

TOR switch refers to:

Select one of the following:

  • Tower switch

  • Top-of-rack switch

Explanation

Question 12 of 91

1

Racks shelves may contain switches:

Select one of the following:

  • True
  • False

Explanation

Question 13 of 91

1

What is a Network Attached Storage (NAS)?

Select one of the following:

  • a storage system directly attached to a server or workstation

  • a computer connected to a network that provides only file-based data storage services to other devices

  • a remote storage unit connected to PC using a specific networking technology

  • a computer connected to a network that provides computation to other devices

Explanation

Question 14 of 91

1

Downtime is a period of time, or a percentage of a time span, when a system is unavailable or offline __________

Select one of the following:

  • none of the other

  • because of routine maintenance

  • because of system crashes

  • regardless of the cause

Explanation

Question 15 of 91

1

In a three-layer network architecture of a Datacenter, which is the layer that is typically associated to the TOR switch?

Select one of the following:

  • Access

  • Core

  • Aggregation

  • None of the others

Explanation

Question 16 of 91

1

Which definition is not encompassed by Dependability:

Select one of the following:

  • Reversibility: ability to reverse a broken service

  • Reliability: continuity of correct service

  • Maintainability: reparation to restore correct service

  • Availability: readiness for correct service

Explanation

Question 17 of 91

1

In the context of SSDs, Blocks are the smallest unit that can be read/written

Select one of the following:

  • True
  • False

Explanation

Question 18 of 91

1

Paravirtualization is a particular type of kernel-level Virtualization that does not rely on a host OS

Select one of the following:

  • True
  • False

Explanation

Question 19 of 91

1

The structure (or topology) of a reliability block diagram is always the same as the structure (or topology) of the modeled system

Select one of the following:

  • True
  • False

Explanation

Question 20 of 91

1

A system virtual machine provides a complete system environment that can support an operating system (potentially with many user processes)

Select one of the following:

  • True
  • False

Explanation

Question 21 of 91

1

Which sentence about Tier Level 4 of datacenter is not correct?

Select one of the following:

  • Fault-tolerant site infrastructure with availability of 99.995%

  • Meets or exceeds all Tier 3 requirements

  • Single non-redundant distribution path serving the IT equipment

  • All cooling equipment is independently dual-powered

Explanation

Question 22 of 91

1

What is a hybrid cloud computing system?

Select one of the following:

  • a cloud used for a single organization

  • a cloud whose energy is produced both by diesel and batteries

  • a cloud shared by several organization

  • a cloud composed by private and public cloud systems

Explanation

Question 23 of 91

1

Paravirtualization cannot be used with unmodified OS

Select one of the following:

  • True
  • False

Explanation

Question 24 of 91

1

Servers in data centers are like regular personal-computers with the same form factor

Select one of the following:

  • True
  • False

Explanation

Question 25 of 91

1

Warehouse-scale computers run a large number of very small applications

Select one of the following:

  • True
  • False

Explanation

Question 26 of 91

1

An Edge Computing system provides higher performance (in terms of memory and computation) than Internet-of-Things devices:

Select one of the following:

  • True
  • False

Explanation

Question 27 of 91

1

Which of the following is not a feature of a fat tree topology in a data center network architecture?

Select one of the following:

  • None of the others

  • It has multiple connections to the core

  • It has a recursive organization

  • It has a three-tier model

Explanation

Question 28 of 91

1

In the context of SSDs, one of the following activities is NOT managed by the Flash Translation Layer:

Select one of the following:

  • Defragmentation

  • Address Translation

  • Garbage Collection

  • Data Allocation

Explanation

Question 29 of 91

1

A System VM:

Select one of the following:

  • Provides the interface to system ISA and user ISA

  • Provides the interface to system ABI and the user ISA

  • Provides the interface to system ABI and the user ABI

  • Provides the interface to system calls and user ABI

Explanation

Question 30 of 91

1

Consider an array of N disks. Select the right order of the RAID levels in terms of effective data storage in ascending order, i.e. for the lower to the higher data storage availability.

Select one of the following:

  • RAID 1+0, RAID 6, RAID 5

  • RAID 6, RAID 5, RAID 1+0

  • None of the others

  • RAID 1+0, RAID 5, RAID 6

Explanation

Question 31 of 91

1

Warehouse-scale computers belong to a single organization, use a relatively homogeneous hardware and system software platform, and share a common systems management layer

Select one of the following:

  • True
  • False

Explanation

Question 32 of 91

1

All faults occurring in a system cause a failure of the system

Select one of the following:

  • True
  • False

Explanation

Question 33 of 91

1

In the context of SSDs, Pages are the smallest unit that can be erased

Select one of the following:

  • True
  • False

Explanation

Question 34 of 91

1

Graphical Processing Units support data-parallel computation

Select one of the following:

  • True
  • False

Explanation

Question 35 of 91

1

A deep neural-network cannot be trained on multiple Graphical Processing Units

Select one of the following:

  • True
  • False

Explanation

Question 36 of 91

1

A System Virtual Machine can provide its functionality:

Select one of the following:

  • Only on the hardware

  • Only on top of an Operating System

  • Either working directly on the hardware or running on an Operating System

  • None of the others

Explanation

Question 37 of 91

1

Hybrid Clouds are systems where one or more public cloud services are combined with private data
center resources into a single virtually managed environment.

Select one of the following:

  • True
  • False

Explanation

Question 38 of 91

1

Graphical Processing Units within a tray are connected using high-bandwidth interconnects, such as NVlink:

Select one of the following:

  • True
  • False

Explanation

Question 39 of 91

1

The need for a constant Internet connection is one of the advantages of data centers

Select one of the following:

  • True
  • False

Explanation

Question 40 of 91

1

In-rack cooling refers to cooling equipment where the cooling coils are adjacent to the rack.

Select one of the following:

  • True
  • False

Explanation

Question 41 of 91

1

Warehouse-scale computers belong to a single organization, use a relatively homogeneous hardware and system software platform, and share a common systems management layer

Select one of the following:

  • True
  • False

Explanation

Question 42 of 91

1

In datacenter storage context, DAS means Distributed Application Storage:

Select one of the following:

  • True
  • False

Explanation

Question 43 of 91

1

Which is the difference between Guest and Host?

Select one of the following:

  • Guest: the underlying platform supporting the environment/system; Host: the software that runs in the VM environment

  • Guest: the software that runs in the VM environment; Host: the underlying platform supporting the environment/system

  • Guest: the underlying platform supporting the environment/system; Host: the virtual machine manager supporting the execution of virtual machines

  • Guest: the underlying platform running in the virtual machine manager; Host: the software that runs in the VM environment

Explanation

Question 44 of 91

1

To increase reliability, which of the following actions is not correct?

Select one of the following:

  • Use multiple redundant components

  • Reduce MTTR to a minimum

  • Have spare components at disposal

  • Use elements with higher MTTF

Explanation

Question 45 of 91

1

Warehouse-scale computers can be designed to operate on multiple data centers

Select one of the following:

  • True
  • False

Explanation

Question 46 of 91

1

Rotational delay is the time to rotate the read head to reach the desired track

Select one of the following:

  • True
  • False

Explanation

Question 47 of 91

1

A system having very small reliability may have large availability

Select one of the following:

  • True
  • False

Explanation

Question 48 of 91

1

In the context of data centers, scalability is the ability for the infrastructure __________ without cost, efficiency, and reliability being compromised. Select the correct item to be included in the previous sentence.

Select one of the following:

  • to be enlarged or to handle an increment of the input requests

  • to run in a larger building

  • none of the others

  • to improve the cooling strategy

Explanation

Question 49 of 91

1

Which is the most appropriate definition for "fault"?

Select one of the following:

  • Any library inconsistency in the Operating System

  • Any defect in the silicon caused by dust particles during manufacturing

  • Any inappropriate usage of the system

  • Any event interfering with the nominal behavior of the system

Explanation

Question 50 of 91

1

One of these levels is NOT part of a typical three-layers network architecture of a data-center?

Select one of the following:

  • Access

  • Aggregation

  • Core

  • Cloud

Explanation

Question 51 of 91

1

In the context of rack servers, 1U is 44.45cm

Select one of the following:

  • True
  • False

Explanation

Question 52 of 91

1

In a reliability block diagram, adding components in series decrease the system reliability with respect to the reliability of the single component

Select one of the following:

  • True
  • False

Explanation

Question 53 of 91

1

Warehouse-scale computers run a large number of very small applications

Select one of the following:

  • True
  • False

Explanation

Question 54 of 91

1

What are the benefits of data center virtualization?

Select one of the following:

  • All of the other answers listed are correct.

  • Consolidation and ease of manageability.

  • Cost savings in power and cooling of the data center.

  • Flexibility and agility.

Explanation

Question 55 of 91

1

When dependability-related requirements must be considered?

Select one of the following:

  • Only during requirements definition

  • When starting testing/verification activities

  • When a prototype of the system is available

  • In every phase of the design flow

Explanation

Question 56 of 91

1

The program in warehouse-scale computing is a service provided by internet:

Select one of the following:

  • True
  • False

Explanation

Question 57 of 91

1

Traditional data centers can host hardware and software for multiple organizational units or different companies.

Select one of the following:

  • True
  • False

Explanation

Question 58 of 91

1

Which is the configuration characterizing the three-layers network architecture of a data-center?

Select one of the following:

  • Sensors – Aggregation – Cloud

  • Access - Aggregation – Cloud

  • Access – Aggregation – Core

  • Access – Fog – Core

Explanation

Question 59 of 91

1

Tower servers have a cable management that is more complex than Rack ones:

Select one of the following:

  • True
  • False

Explanation

Question 60 of 91

1

Gmail is an example of:

Select one of the following:

  • Software as a Service

  • Hardware as a service

  • Platform as a Service

  • Infrastructure as a service

Explanation

Question 61 of 91

1

Consider an array of N disks. Select the right order of the RAID levels in terms of effective data
storage in descending order, i.e. for the higher to the lower data storage availability.

Select one of the following:

  • RAID 0, RAID 4, RAID 6

  • RAID 6, RAID 0, RAID 4

  • None of the others

  • RAID 4, RAID 6, RAID 0

Explanation

Question 62 of 91

1

Data centers are well suited for real-time decisions in autonomous car context

Select one of the following:

  • True
  • False

Explanation

Question 63 of 91

1

After a fault activation the system is always expected to fail

Select one of the following:

  • True
  • False

Explanation

Question 64 of 91

1

The reliability of a Triple Modular Redundancy (TMR) system is always greater than the reliability
of the single copy of the system

Select one of the following:

  • True
  • False

Explanation

Question 65 of 91

1

What is a Data Center?

Select one of the following:

  • None of the others

  • A building or portion of a building whose primary function is to research new data.

  • A building or a portion of a building whose primary function is to house a computer room and its related support areas.

  • A room in a building dedicated to monitoring data and information.

Explanation

Question 66 of 91

1

Seek delay is the time needed by the disk to place the desired sector under the read head

Select one of the following:

  • True
  • False

Explanation

Question 67 of 91

1

What is the Hardware-level virtualization?

Select one of the following:

  • The virtualization layer is placed between the operating system and the applications

  • The virtualization layer is above the applications

  • The virtualization layer is placed between the hardware and the operating system

  • The virtualization layer is placed below the hardware

Explanation

Question 68 of 91

1

Which aspect is a drawback of data center computing platform?

Select one of the following:

  • Power consumption

  • Device independence

  • Universal access

  • Unlimited storage capacity

Explanation

Question 69 of 91

1

Racks shelves are used to store servers and other IT equipments:

Select one of the following:

  • True
  • False

Explanation

Question 70 of 91

1

In warehouse-scale computers the software running on these systems executes on clusters of hundreds to thousands of individual servers

Select one of the following:

  • True
  • False

Explanation

Question 71 of 91

1

In a data center for AI, servers includes both general purpose CPUs and accelerators (such as
GPUs, TPUs and FPGAs):

Select one of the following:

  • True
  • False

Explanation

Question 72 of 91

1

NVlink is a low-bandwidth connection among Graphical Processing Units:

Select one of the following:

  • True
  • False

Explanation

Question 73 of 91

1

A process VM:

Select one of the following:

  • Provides the interface to system calls and user ABI

  • Provides the interface to system ABI and the user ISA

  • Provides the interface to system calls and user ISA

  • Provides the interface to system ABI and the user ABI

Explanation

Question 74 of 91

1

One of these configurations is not considered in Data-center network architectures. Which one?

Select one of the following:

  • D-Cell

  • Three layers

  • Fat-tree

  • Direct Connections

Explanation

Question 75 of 91

1

What is the average latency for an Hard Disk Drive?

Select one of the following:

  • Time to wait for the sector

  • Time to wait for the data transfer

  • Time to wait for the head movement

  • Time to wait for the cylinder

Explanation

Question 76 of 91

1

In the context of SSDs, Pages are the smallest unit that can be read/written

Select one of the following:

  • True
  • False

Explanation

Question 77 of 91

1

In-row cooling adds an air-to-water heat exchanger at the back of a rack so the hot air exiting the
servers immediately flows over coils cooled by water.

Select one of the following:

  • True
  • False

Explanation

Question 78 of 91

1

Select the wrong definition. A Virtual Machine:

Select one of the following:

  • none of the others

  • may appear as having different resources than the physical machine

  • may result in a different level of performance with respect to the physical machine

  • provides identical software behavior

Explanation

Question 79 of 91

1

Tower servers can be cooled easily:

Select one of the following:

  • True
  • False

Explanation

Question 80 of 91

1

What is the TBW in a Solid State Disk?

Select one of the following:

  • Total amount of data that must be written into an SSD before the completion of the space

  • Total amount of data that can be written into an SSD before it is likely to fail

  • Total amount of data that can be read from an SSD

  • Total amount of data that can be written into an SSD

Explanation

Question 81 of 91

1

The following sentence: "The probability that the component does not fail in the interval 0 ... t,
knowing that at the instant t = 0 the component was working correctly" defines:

Select one of the following:

  • Dependability

  • Reliability

  • Availability

  • None of the other

Explanation

Question 82 of 91

1

Consider an array of N disks. Select the right order of the RAID levels in terms of MTTFRAID
in descending order, i.e. for the higher to the lower MTTF. Consider a number of disks N that is
large enough to satisfy the minimum requirements for all the RAID levels.

Select one of the following:

  • None of the others

  • RAID 5, RAID 1+0, RAID 0+1

  • RAID 1+0, RAID 0+1, RAID 5

  • RAID 0+1, RAID 5, RAID 1+0

Explanation

Question 83 of 91

1

Racks servers have a cable management that is more complex than Tower ones:

Select one of the following:

  • True
  • False

Explanation

Question 84 of 91

1

Traditional data centers typically host a large number of relatively small- or medium-sized applications

Select one of the following:

  • True
  • False

Explanation

Question 85 of 91

1

In-row cooling works like in-rack cooling except the cooling coils are not in the rack, but adjacent
to the rack.

Select one of the following:

  • True
  • False

Explanation

Question 86 of 91

1

Rack, blade and towers are form factor of servers in data centers

Select one of the following:

  • True
  • False

Explanation

Question 87 of 91

1

Warehouse-scale computers comprise important components related to power delivery, cooling, and building infrastructure

Select one of the following:

  • True
  • False

Explanation

Question 88 of 91

1

What is a Graphical Processing Unit (GPU)?

Select one of the following:

  • A specialized hardware meant to provide storage in a data center

  • A specialized hardware meant to support data-parallel computation

  • An Internet-of-Things device meant to operate in the field

  • A specialized hardware meant to provide networking in a data center

Explanation

Question 89 of 91

1

Rack servers need additional cooling systems due to their high overall component density

Select one of the following:

  • True
  • False

Explanation

Question 90 of 91

1

Is the Java Runtime Environment an example of system virtual machine?

Select one of the following:

  • True
  • False

Explanation

Question 91 of 91

1

Which is the main characteristic of the D-Cell topology for data center network architectures?

Select one of the following:

  • The network is organized in a distributed way

  • The network comprises edge, aggregation and core layers

  • the network is organized in a recursive way

  • the network is organized in a hierarchical way

Explanation

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