38720438
Descripción
Test por Giovanni De Lucia, actualizado hace más de 1 año
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Creado por Giovanni De Lucia
hace más de 1 año
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Pregunta 1
Pregunta
In the Microkernel architecture of VMs:
Respuesta
-
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
Pregunta 2
Pregunta
Which statement about Paravirtualization is correct?
Respuesta
-
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
Pregunta 3
Pregunta
Which is the goal of the "machine-learning software as a service"?
Respuesta
-
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
Pregunta 4
Pregunta
An emulator:
Respuesta
-
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
Pregunta 5
Pregunta
Does an emulator read, interpret and execute all the bytes included in the memory of system it is going to reproduce?
Respuesta
- True
- False
Pregunta 6
Pregunta
The program in warehouse-scale computing may consist of tens or more individual programs:
Respuesta
- True
- False
Pregunta 7
Pregunta
Data centers are buildings where multiple servers and communication units are co-located
Respuesta
- True
- False
Pregunta 8
Pregunta
What is a computing infrastructure?
Respuesta
-
Technological infrastructure that provides hardware and software for computation to other systems and services
-
Technological infrastructure that provides applications to other systems and services
Pregunta 9
Pregunta
Tower servers consumes less space than rack and blade:
Respuesta
- True
- False
Pregunta 10
Pregunta
Blade servers require expensive configurations:
Respuesta
- True
- False
Pregunta 11
Pregunta
TOR switch refers to:
Respuesta
-
Tower switch
-
Top-of-rack switch
Pregunta 12
Pregunta
Racks shelves may contain switches:
Respuesta
- True
- False
Pregunta 13
Pregunta
What is a Network Attached Storage (NAS)?
Respuesta
-
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
Pregunta 14
Pregunta
Downtime is a period of time, or a percentage of a time span, when a system is unavailable or offline __________
Respuesta
-
none of the other
-
because of routine maintenance
-
because of system crashes
-
regardless of the cause
Pregunta 15
Pregunta
In a three-layer network architecture of a Datacenter, which is the layer that is typically associated to the TOR switch?
Respuesta
-
Access
-
Core
-
Aggregation
-
None of the others
Pregunta 16
Pregunta
Which definition is not encompassed by Dependability:
Respuesta
-
Reversibility: ability to reverse a broken service
-
Reliability: continuity of correct service
-
Maintainability: reparation to restore correct service
-
Availability: readiness for correct service
Pregunta 17
Pregunta
In the context of SSDs, Blocks are the smallest unit that can be read/written
Respuesta
- True
- False
Pregunta 18
Pregunta
Paravirtualization is a particular type of kernel-level Virtualization that does not rely on a host OS
Respuesta
- True
- False
Pregunta 19
Pregunta
The structure (or topology) of a reliability block diagram is always the same as the structure (or topology) of the modeled system
Respuesta
- True
- False
Pregunta 20
Pregunta
A system virtual machine provides a complete system environment that can support an operating system (potentially with many user processes)
Respuesta
- True
- False
Pregunta 21
Pregunta
Which sentence about Tier Level 4 of datacenter is not correct?
Respuesta
-
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
Pregunta 22
Pregunta
What is a hybrid cloud computing system?
Respuesta
-
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
Pregunta 23
Pregunta
Paravirtualization cannot be used with unmodified OS
Respuesta
- True
- False
Pregunta 24
Pregunta
Servers in data centers are like regular personal-computers with the same form factor
Respuesta
- True
- False
Pregunta 25
Pregunta
Warehouse-scale computers run a large number of very small applications
Respuesta
- True
- False
Pregunta 26
Pregunta
An Edge Computing system provides higher performance (in terms of memory and computation) than Internet-of-Things devices:
Respuesta
- True
- False
Pregunta 27
Pregunta
Which of the following is not a feature of a fat tree topology in a data center network architecture?
Respuesta
-
None of the others
-
It has multiple connections to the core
-
It has a recursive organization
-
It has a three-tier model
Pregunta 28
Pregunta
In the context of SSDs, one of the following activities is NOT managed by the Flash Translation Layer:
Respuesta
-
Defragmentation
-
Address Translation
-
Garbage Collection
-
Data Allocation
Pregunta 29
Pregunta
A System VM:
Respuesta
-
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
Pregunta 30
Pregunta
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.
Respuesta
-
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
Pregunta 31
Pregunta
Warehouse-scale computers belong to a single organization, use a relatively homogeneous hardware and system software platform, and share a common systems management layer
Respuesta
- True
- False
Pregunta 32
Pregunta
All faults occurring in a system cause a failure of the system
Respuesta
- True
- False
Pregunta 33
Pregunta
In the context of SSDs, Pages are the smallest unit that can be erased
Respuesta
- True
- False
Pregunta 34
Pregunta
Graphical Processing Units support data-parallel computation
Respuesta
- True
- False
Pregunta 35
Pregunta
A deep neural-network cannot be trained on multiple Graphical Processing Units
Respuesta
- True
- False
Pregunta 36
Pregunta
A System Virtual Machine can provide its functionality:
Respuesta
-
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
Pregunta 37
Pregunta
Hybrid Clouds are systems where one or more public cloud services are combined with private data
center resources into a single virtually managed environment.
Respuesta
- True
- False
Pregunta 38
Pregunta
Graphical Processing Units within a tray are connected using high-bandwidth interconnects, such as NVlink:
Respuesta
- True
- False
Pregunta 39
Pregunta
The need for a constant Internet connection is one of the advantages of data centers
Respuesta
- True
- False
Pregunta 40
Pregunta
In-rack cooling refers to cooling equipment where the cooling coils are adjacent to the rack.
Respuesta
- True
- False
Pregunta 41
Pregunta
Warehouse-scale computers belong to a single organization, use a relatively homogeneous hardware and system software platform, and share a common systems management layer
Respuesta
- True
- False
Pregunta 42
Pregunta
In datacenter storage context, DAS means Distributed Application Storage:
Respuesta
- True
- False
Pregunta 43
Pregunta
Which is the difference between Guest and Host?
Respuesta
-
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
Pregunta 44
Pregunta
To increase reliability, which of the following actions is not correct?
Respuesta
-
Use multiple redundant components
-
Reduce MTTR to a minimum
-
Have spare components at disposal
-
Use elements with higher MTTF
Pregunta 45
Pregunta
Warehouse-scale computers can be designed to operate on multiple data centers
Respuesta
- True
- False
Pregunta 46
Pregunta
Rotational delay is the time to rotate the read head to reach the desired track
Respuesta
- True
- False
Pregunta 47
Pregunta
A system having very small reliability may have large availability
Respuesta
- True
- False
Pregunta 48
Pregunta
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.
Respuesta
-
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
Pregunta 49
Pregunta
Which is the most appropriate definition for "fault"?
Respuesta
-
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
Pregunta 50
Pregunta
One of these levels is NOT part of a typical three-layers network architecture of a data-center?
Respuesta
-
Access
-
Aggregation
-
Core
-
Cloud
Pregunta 51
Pregunta
In the context of rack servers, 1U is 44.45cm
Respuesta
- True
- False
Pregunta 52
Pregunta
In a reliability block diagram, adding components in series decrease the system reliability with respect to the reliability of the single component
Respuesta
- True
- False
Pregunta 53
Pregunta
Warehouse-scale computers run a large number of very small applications
Respuesta
- True
- False
Pregunta 54
Pregunta
What are the benefits of data center virtualization?
Respuesta
-
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.
Pregunta 55
Pregunta
When dependability-related requirements must be considered?
Respuesta
-
Only during requirements definition
-
When starting testing/verification activities
-
When a prototype of the system is available
-
In every phase of the design flow
Pregunta 56
Pregunta
The program in warehouse-scale computing is a service provided by internet:
Respuesta
- True
- False
Pregunta 57
Pregunta
Traditional data centers can host hardware and software for multiple organizational units or different companies.
Respuesta
- True
- False
Pregunta 58
Pregunta
Which is the configuration characterizing the three-layers network architecture of a data-center?
Respuesta
-
Sensors – Aggregation – Cloud
-
Access - Aggregation – Cloud
-
Access – Aggregation – Core
-
Access – Fog – Core
Pregunta 59
Pregunta
Tower servers have a cable management that is more complex than Rack ones:
Respuesta
- True
- False
Pregunta 60
Pregunta
Gmail is an example of:
Respuesta
-
Software as a Service
-
Hardware as a service
-
Platform as a Service
-
Infrastructure as a service
Pregunta 61
Pregunta
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.
Respuesta
-
RAID 0, RAID 4, RAID 6
-
RAID 6, RAID 0, RAID 4
-
None of the others
-
RAID 4, RAID 6, RAID 0
Pregunta 62
Pregunta
Data centers are well suited for real-time decisions in autonomous car context
Respuesta
- True
- False
Pregunta 63
Pregunta
After a fault activation the system is always expected to fail
Respuesta
- True
- False
Pregunta 64
Pregunta
The reliability of a Triple Modular Redundancy (TMR) system is always greater than the reliability
of the single copy of the system
Respuesta
- True
- False
Pregunta 65
Pregunta
What is a Data Center?
Respuesta
-
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.
Pregunta 66
Pregunta
Seek delay is the time needed by the disk to place the desired sector under the read head
Respuesta
- True
- False
Pregunta 67
Pregunta
What is the Hardware-level virtualization?
Respuesta
-
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
Pregunta 68
Pregunta
Which aspect is a drawback of data center computing platform?
Respuesta
-
Power consumption
-
Device independence
-
Universal access
-
Unlimited storage capacity
Pregunta 69
Pregunta
Racks shelves are used to store servers and other IT equipments:
Respuesta
- True
- False
Pregunta 70
Pregunta
In warehouse-scale computers the software running on these systems executes on clusters of hundreds to thousands of individual servers
Respuesta
- True
- False
Pregunta 71
Pregunta
In a data center for AI, servers includes both general purpose CPUs and accelerators (such as
GPUs, TPUs and FPGAs):
Respuesta
- True
- False
Pregunta 72
Pregunta
NVlink is a low-bandwidth connection among Graphical Processing Units:
Respuesta
- True
- False
Pregunta 73
Pregunta
A process VM:
Respuesta
-
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
Pregunta 74
Pregunta
One of these configurations is not considered in Data-center network architectures. Which one?
Respuesta
-
D-Cell
-
Three layers
-
Fat-tree
-
Direct Connections
Pregunta 75
Pregunta
What is the average latency for an Hard Disk Drive?
Respuesta
-
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
Pregunta 76
Pregunta
In the context of SSDs, Pages are the smallest unit that can be read/written
Respuesta
- True
- False
Pregunta 77
Pregunta
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.
Respuesta
- True
- False
Pregunta 78
Pregunta
Select the wrong definition. A Virtual Machine:
Respuesta
-
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
Pregunta 79
Pregunta
Tower servers can be cooled easily:
Respuesta
- True
- False
Pregunta 80
Pregunta
What is the TBW in a Solid State Disk?
Respuesta
-
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
Pregunta 81
Pregunta
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:
Respuesta
-
Dependability
-
Reliability
-
Availability
-
None of the other
Pregunta 82
Pregunta
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.
Respuesta
-
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
Pregunta 83
Pregunta
Racks servers have a cable management that is more complex than Tower ones:
Respuesta
- True
- False
Pregunta 84
Pregunta
Traditional data centers typically host a large number of relatively small- or medium-sized applications
Respuesta
- True
- False
Pregunta 85
Pregunta
In-row cooling works like in-rack cooling except the cooling coils are not in the rack, but adjacent
to the rack.
Respuesta
- True
- False
Pregunta 86
Pregunta
Rack, blade and towers are form factor of servers in data centers
Respuesta
- True
- False
Pregunta 87
Pregunta
Warehouse-scale computers comprise important components related to power delivery, cooling, and building infrastructure
Respuesta
- True
- False
Pregunta 88
Pregunta
What is a Graphical Processing Unit (GPU)?
Respuesta
-
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
Pregunta 89
Pregunta
Rack servers need additional cooling systems due to their high overall component density
Respuesta
- True
- False
Pregunta 90
Pregunta
Is the Java Runtime Environment an example of system virtual machine?
Respuesta
- True
- False
Pregunta 91
Pregunta
Which is the main characteristic of the D-Cell topology for data center network architectures?
Respuesta
-
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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