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CI - PoliMI

Description

Computing Infrastructures Multiple Choiche and True/False quiz collection
Giovanni De Lucia
Quiz by Giovanni De Lucia, updated more than 1 year ago
Giovanni De Lucia
Created by Giovanni De Lucia over 1 year ago
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Resource summary

Question 1

Question
In the Microkernel architecture of VMs:
Answer
  • 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

Question 2

Question
Which statement about Paravirtualization is correct?
Answer
  • 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

Question 3

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

Question 4

Question
An emulator:
Answer
  • 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

Question 5

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

Question 6

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

Question 7

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

Question 8

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

Question 9

Question
Tower servers consumes less space than rack and blade:
Answer
  • True
  • False

Question 10

Question
Blade servers require expensive configurations:
Answer
  • True
  • False

Question 11

Question
TOR switch refers to:
Answer
  • Tower switch
  • Top-of-rack switch

Question 12

Question
Racks shelves may contain switches:
Answer
  • True
  • False

Question 13

Question
What is a Network Attached Storage (NAS)?
Answer
  • 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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

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

Question 22

Question
What is a hybrid cloud computing system?
Answer
  • 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

Question 23

Question
Paravirtualization cannot be used with unmodified OS
Answer
  • True
  • False

Question 24

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

Question 25

Question
Warehouse-scale computers run a large number of very small applications
Answer
  • True
  • False

Question 26

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

Question 27

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

Question 28

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

Question 29

Question
A System VM:
Answer
  • 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

Question 30

Question
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.
Answer
  • 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

Question 31

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

Question 32

Question
All faults occurring in a system cause a failure of the system
Answer
  • True
  • False

Question 33

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

Question 34

Question
Graphical Processing Units support data-parallel computation
Answer
  • True
  • False

Question 35

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

Question 36

Question
A System Virtual Machine can provide its functionality:
Answer
  • 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

Question 37

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

Question 38

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

Question 39

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

Question 40

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

Question 41

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

Question 42

Question
In datacenter storage context, DAS means Distributed Application Storage:
Answer
  • True
  • False

Question 43

Question
Which is the difference between Guest and Host?
Answer
  • 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

Question 44

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

Question 45

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

Question 46

Question
Rotational delay is the time to rotate the read head to reach the desired track
Answer
  • True
  • False

Question 47

Question
A system having very small reliability may have large availability
Answer
  • True
  • False

Question 48

Question
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.
Answer
  • 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

Question 49

Question
Which is the most appropriate definition for "fault"?
Answer
  • 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

Question 50

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

Question 51

Question
In the context of rack servers, 1U is 44.45cm
Answer
  • True
  • False

Question 52

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

Question 53

Question
Warehouse-scale computers run a large number of very small applications
Answer
  • True
  • False

Question 54

Question
What are the benefits of data center virtualization?
Answer
  • 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.

Question 55

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

Question 56

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

Question 57

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

Question 58

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

Question 59

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

Question 60

Question
Gmail is an example of:
Answer
  • Software as a Service
  • Hardware as a service
  • Platform as a Service
  • Infrastructure as a service

Question 61

Question
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.
Answer
  • RAID 0, RAID 4, RAID 6
  • RAID 6, RAID 0, RAID 4
  • None of the others
  • RAID 4, RAID 6, RAID 0

Question 62

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

Question 63

Question
After a fault activation the system is always expected to fail
Answer
  • True
  • False

Question 64

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

Question 65

Question
What is a Data Center?
Answer
  • 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.

Question 66

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

Question 67

Question
What is the Hardware-level virtualization?
Answer
  • 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

Question 68

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

Question 69

Question
Racks shelves are used to store servers and other IT equipments:
Answer
  • True
  • False

Question 70

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

Question 71

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

Question 72

Question
NVlink is a low-bandwidth connection among Graphical Processing Units:
Answer
  • True
  • False

Question 73

Question
A process VM:
Answer
  • 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

Question 74

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

Question 75

Question
What is the average latency for an Hard Disk Drive?
Answer
  • 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

Question 76

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

Question 77

Question
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.
Answer
  • True
  • False

Question 78

Question
Select the wrong definition. A Virtual Machine:
Answer
  • 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

Question 79

Question
Tower servers can be cooled easily:
Answer
  • True
  • False

Question 80

Question
What is the TBW in a Solid State Disk?
Answer
  • 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

Question 81

Question
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:
Answer
  • Dependability
  • Reliability
  • Availability
  • None of the other

Question 82

Question
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.
Answer
  • 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

Question 83

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

Question 84

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

Question 85

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

Question 86

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

Question 87

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

Question 88

Question
What is a Graphical Processing Unit (GPU)?
Answer
  • 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

Question 89

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

Question 90

Question
Is the Java Runtime Environment an example of system virtual machine?
Answer
  • True
  • False

Question 91

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