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Beschreibung

Computing Infrastructures Multiple Choiche and True/False quiz collection
Giovanni De Lucia
Quiz von Giovanni De Lucia, aktualisiert more than 1 year ago
Giovanni De Lucia
Erstellt von Giovanni De Lucia vor mehr als ein Jahr
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Zusammenfassung der Ressource

Frage 1

Frage
In the Microkernel architecture of VMs:
Antworten
  • 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

Frage 2

Frage
Which statement about Paravirtualization is correct?
Antworten
  • 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

Frage 3

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

Frage 4

Frage
An emulator:
Antworten
  • 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

Frage 5

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

Frage 6

Frage
The program in warehouse-scale computing may consist of tens or more individual programs:
Antworten
  • True
  • False

Frage 7

Frage
Data centers are buildings where multiple servers and communication units are co-located
Antworten
  • True
  • False

Frage 8

Frage
What is a computing infrastructure?
Antworten
  • Technological infrastructure that provides hardware and software for computation to other systems and services
  • Technological infrastructure that provides applications to other systems and services

Frage 9

Frage
Tower servers consumes less space than rack and blade:
Antworten
  • True
  • False

Frage 10

Frage
Blade servers require expensive configurations:
Antworten
  • True
  • False

Frage 11

Frage
TOR switch refers to:
Antworten
  • Tower switch
  • Top-of-rack switch

Frage 12

Frage
Racks shelves may contain switches:
Antworten
  • True
  • False

Frage 13

Frage
What is a Network Attached Storage (NAS)?
Antworten
  • 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

Frage 14

Frage
Downtime is a period of time, or a percentage of a time span, when a system is unavailable or offline __________
Antworten
  • none of the other
  • because of routine maintenance
  • because of system crashes
  • regardless of the cause

Frage 15

Frage
In a three-layer network architecture of a Datacenter, which is the layer that is typically associated to the TOR switch?
Antworten
  • Access
  • Core
  • Aggregation
  • None of the others

Frage 16

Frage
Which definition is not encompassed by Dependability:
Antworten
  • Reversibility: ability to reverse a broken service
  • Reliability: continuity of correct service
  • Maintainability: reparation to restore correct service
  • Availability: readiness for correct service

Frage 17

Frage
In the context of SSDs, Blocks are the smallest unit that can be read/written
Antworten
  • True
  • False

Frage 18

Frage
Paravirtualization is a particular type of kernel-level Virtualization that does not rely on a host OS
Antworten
  • True
  • False

Frage 19

Frage
The structure (or topology) of a reliability block diagram is always the same as the structure (or topology) of the modeled system
Antworten
  • True
  • False

Frage 20

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

Frage 21

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

Frage 22

Frage
What is a hybrid cloud computing system?
Antworten
  • 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

Frage 23

Frage
Paravirtualization cannot be used with unmodified OS
Antworten
  • True
  • False

Frage 24

Frage
Servers in data centers are like regular personal-computers with the same form factor
Antworten
  • True
  • False

Frage 25

Frage
Warehouse-scale computers run a large number of very small applications
Antworten
  • True
  • False

Frage 26

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

Frage 27

Frage
Which of the following is not a feature of a fat tree topology in a data center network architecture?
Antworten
  • None of the others
  • It has multiple connections to the core
  • It has a recursive organization
  • It has a three-tier model

Frage 28

Frage
In the context of SSDs, one of the following activities is NOT managed by the Flash Translation Layer:
Antworten
  • Defragmentation
  • Address Translation
  • Garbage Collection
  • Data Allocation

Frage 29

Frage
A System VM:
Antworten
  • 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

Frage 30

Frage
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.
Antworten
  • 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

Frage 31

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

Frage 32

Frage
All faults occurring in a system cause a failure of the system
Antworten
  • True
  • False

Frage 33

Frage
In the context of SSDs, Pages are the smallest unit that can be erased
Antworten
  • True
  • False

Frage 34

Frage
Graphical Processing Units support data-parallel computation
Antworten
  • True
  • False

Frage 35

Frage
A deep neural-network cannot be trained on multiple Graphical Processing Units
Antworten
  • True
  • False

Frage 36

Frage
A System Virtual Machine can provide its functionality:
Antworten
  • 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

Frage 37

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

Frage 38

Frage
Graphical Processing Units within a tray are connected using high-bandwidth interconnects, such as NVlink:
Antworten
  • True
  • False

Frage 39

Frage
The need for a constant Internet connection is one of the advantages of data centers
Antworten
  • True
  • False

Frage 40

Frage
In-rack cooling refers to cooling equipment where the cooling coils are adjacent to the rack.
Antworten
  • True
  • False

Frage 41

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

Frage 42

Frage
In datacenter storage context, DAS means Distributed Application Storage:
Antworten
  • True
  • False

Frage 43

Frage
Which is the difference between Guest and Host?
Antworten
  • 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

Frage 44

Frage
To increase reliability, which of the following actions is not correct?
Antworten
  • Use multiple redundant components
  • Reduce MTTR to a minimum
  • Have spare components at disposal
  • Use elements with higher MTTF

Frage 45

Frage
Warehouse-scale computers can be designed to operate on multiple data centers
Antworten
  • True
  • False

Frage 46

Frage
Rotational delay is the time to rotate the read head to reach the desired track
Antworten
  • True
  • False

Frage 47

Frage
A system having very small reliability may have large availability
Antworten
  • True
  • False

Frage 48

Frage
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.
Antworten
  • 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

Frage 49

Frage
Which is the most appropriate definition for "fault"?
Antworten
  • 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

Frage 50

Frage
One of these levels is NOT part of a typical three-layers network architecture of a data-center?
Antworten
  • Access
  • Aggregation
  • Core
  • Cloud

Frage 51

Frage
In the context of rack servers, 1U is 44.45cm
Antworten
  • True
  • False

Frage 52

Frage
In a reliability block diagram, adding components in series decrease the system reliability with respect to the reliability of the single component
Antworten
  • True
  • False

Frage 53

Frage
Warehouse-scale computers run a large number of very small applications
Antworten
  • True
  • False

Frage 54

Frage
What are the benefits of data center virtualization?
Antworten
  • 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.

Frage 55

Frage
When dependability-related requirements must be considered?
Antworten
  • Only during requirements definition
  • When starting testing/verification activities
  • When a prototype of the system is available
  • In every phase of the design flow

Frage 56

Frage
The program in warehouse-scale computing is a service provided by internet:
Antworten
  • True
  • False

Frage 57

Frage
Traditional data centers can host hardware and software for multiple organizational units or different companies.
Antworten
  • True
  • False

Frage 58

Frage
Which is the configuration characterizing the three-layers network architecture of a data-center?
Antworten
  • Sensors – Aggregation – Cloud
  • Access - Aggregation – Cloud
  • Access – Aggregation – Core
  • Access – Fog – Core

Frage 59

Frage
Tower servers have a cable management that is more complex than Rack ones:
Antworten
  • True
  • False

Frage 60

Frage
Gmail is an example of:
Antworten
  • Software as a Service
  • Hardware as a service
  • Platform as a Service
  • Infrastructure as a service

Frage 61

Frage
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.
Antworten
  • RAID 0, RAID 4, RAID 6
  • RAID 6, RAID 0, RAID 4
  • None of the others
  • RAID 4, RAID 6, RAID 0

Frage 62

Frage
Data centers are well suited for real-time decisions in autonomous car context
Antworten
  • True
  • False

Frage 63

Frage
After a fault activation the system is always expected to fail
Antworten
  • True
  • False

Frage 64

Frage
The reliability of a Triple Modular Redundancy (TMR) system is always greater than the reliability of the single copy of the system
Antworten
  • True
  • False

Frage 65

Frage
What is a Data Center?
Antworten
  • 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.

Frage 66

Frage
Seek delay is the time needed by the disk to place the desired sector under the read head
Antworten
  • True
  • False

Frage 67

Frage
What is the Hardware-level virtualization?
Antworten
  • 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

Frage 68

Frage
Which aspect is a drawback of data center computing platform?
Antworten
  • Power consumption
  • Device independence
  • Universal access
  • Unlimited storage capacity

Frage 69

Frage
Racks shelves are used to store servers and other IT equipments:
Antworten
  • True
  • False

Frage 70

Frage
In warehouse-scale computers the software running on these systems executes on clusters of hundreds to thousands of individual servers
Antworten
  • True
  • False

Frage 71

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

Frage 72

Frage
NVlink is a low-bandwidth connection among Graphical Processing Units:
Antworten
  • True
  • False

Frage 73

Frage
A process VM:
Antworten
  • 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

Frage 74

Frage
One of these configurations is not considered in Data-center network architectures. Which one?
Antworten
  • D-Cell
  • Three layers
  • Fat-tree
  • Direct Connections

Frage 75

Frage
What is the average latency for an Hard Disk Drive?
Antworten
  • 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

Frage 76

Frage
In the context of SSDs, Pages are the smallest unit that can be read/written
Antworten
  • True
  • False

Frage 77

Frage
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.
Antworten
  • True
  • False

Frage 78

Frage
Select the wrong definition. A Virtual Machine:
Antworten
  • 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

Frage 79

Frage
Tower servers can be cooled easily:
Antworten
  • True
  • False

Frage 80

Frage
What is the TBW in a Solid State Disk?
Antworten
  • 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

Frage 81

Frage
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:
Antworten
  • Dependability
  • Reliability
  • Availability
  • None of the other

Frage 82

Frage
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.
Antworten
  • 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

Frage 83

Frage
Racks servers have a cable management that is more complex than Tower ones:
Antworten
  • True
  • False

Frage 84

Frage
Traditional data centers typically host a large number of relatively small- or medium-sized applications
Antworten
  • True
  • False

Frage 85

Frage
In-row cooling works like in-rack cooling except the cooling coils are not in the rack, but adjacent to the rack.
Antworten
  • True
  • False

Frage 86

Frage
Rack, blade and towers are form factor of servers in data centers
Antworten
  • True
  • False

Frage 87

Frage
Warehouse-scale computers comprise important components related to power delivery, cooling, and building infrastructure
Antworten
  • True
  • False

Frage 88

Frage
What is a Graphical Processing Unit (GPU)?
Antworten
  • 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

Frage 89

Frage
Rack servers need additional cooling systems due to their high overall component density
Antworten
  • True
  • False

Frage 90

Frage
Is the Java Runtime Environment an example of system virtual machine?
Antworten
  • True
  • False

Frage 91

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