Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Computing infrastructures 🔋 > Risposta multipla > Flashcards

Risposta multipla Flashcards

1
Q

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

A All cooling equipment is independently dual-powered
B Single non-redundant distribution path serving the IT equipment
C Meets or exceeds all Tier 3 requirements
D Fault-tolerant site infrastructure with availability of 99.995%

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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.

A to be enlarged or to handle an increment of the input requests
B to run in a larger building
C none of the others
D to improve the cooling strategy

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which is the most appropriate definition for “fault”?

A Any library inconsistency in the Operating System
B Any defect in the silicon caused by dust particles during manufacturing
C Any inappropriate usage of the system
D Any event interfering with the nominal behavior of the system

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A Access
B Aggregation
C Core
D Cloud

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Question 1
Which is the main characteristic of the D-Cell topology for data center network architectures?

A The network is organized in a distributed way
B The network comprises edge, aggregation and core layers
C the network is organized in a recursive way
D the network is organized in a hierarchical way

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A It has multiple connections to the core
B None of the others
C It has a recursive organization
D It has a three-tier model

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the Hardware-level virtualization?

A The virtualization layer is placed between the operating system and the applications
B The virtualization layer is above the applications
C The virtualization layer is placed between the hardware and the operating system
D The virtualization layer is placed below the hardware

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which aspect is a drawback of data center computing platform?

A Power consumption
B Device independence
C Universal access
D Unlimited storage capacity

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A Defragmentation
B Address Translation
C Garbage Collection
D Data Allocation

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

A System VM:

A Provides the interface to system ISA and user ISA
B Provides the interface to system ABI and the user ISA
C Provides the interface to system ABI and the user ABI
D Provides the interface to system calls and user ABI

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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.

A RAID 1+0, RAID 6, RAID 5
B RAID 6, RAID 5, RAID 1+0
C None of the others
D RAID 1+0, RAID 5, RAID 6

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A D-Cell
B Three layers
C Fat-tree
D Direct Connections

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the average latency for an Hard Disk Drive?

A Time to wait for the sector
B Time to wait for the data transfer
C Time to wait for the head movement
D Time to wait for the cylinder

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the TBW in a Solid State Disk?

A Total amount of data that must be written into an SSD before the completion of the space
B Total amount of data that can be written into an SSD before it is likely to fail
C Total amount of data that can be read from an SSD
D Total amount of data that can be written into an SSD

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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:

A Dependability
B Reliability
C Availability
D None of the other

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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.

A None of the others
B RAID 5, RAID 1+0, RAID 0+1
C RAID 1+0, RAID 0+1, RAID 5
D RAID 0+1, RAID 5, RAID 1+0

A

C

17
Q

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

A Have spare components at disposal
B Reduce MTTR to a minimum
C Use elements with low MTTF
D Use multiple redundant components

A

C

18
Q

What is a Network Attached Storage (NAS)?

A a computer connected to a network that provides computation to other devices
B a remote storage unit connected to PC using a specific networking technology
C a storage system directly attached to a server or workstation
D a computer connected to a network that provides only file-based data storage services to

A

D

19
Q

Select the wrong definition. A Virtual Machine:

A none of the others
B may appear as having different resources than the physical machine
C may result in a different level of performance with respect to the physical machine
D provides identical software behavior

A

A

20
Q

What are the benefits of data center virtualization?
A All of the other answers listed are correct.
B Consolidation and ease of manageability.
C Cost savings in power and cooling of the data center.
D Flexibility and agility

A

A

21
Q

Which statement about Paravirtualization is correct?
A It cannot be used with traditional Operating Systems
B Hooks are not required
C Guest OS and VMM are independent each other
D It is the same of Kernel-level Virtualization

A

A

22
Q

When dependability-related requirements must be considered? Select the right answer.
A Only during requirements definition
B When starting testing/verification activities
C When a prototype of the system is available
D In every phase of the design flow

A

D

23
Q

A System Virtual Machine can provide its functionality:
A Only on the hardware
B Only on top of an Operating System
C Either working directly on the hardware or running on an Operating System
D None of the others

A

C

24
Q

In a three-layer network architecture of a Datacenter, which is the layer that is
typically associated to the TOR switch?
A Access
B Core
C Aggregation
D None of the others

A

A

25
Q

Which is the difference between Guest and Host?

A Guest: the underlying platform supporting the environment/system; Host: the software that
runs in the VM environment
B Guest: the software that runs in the VM environment; Host: the underlying platform supporting the environment/system
C Guest: the underlying platform supporting the environment/system; Host: the virtual machine manager supporting the execution of virtual machines
D Guest: the underlying platform running in the virtual machine manager; Host: the software
that runs in the VM environment

A

B

26
Q

In the Microkernel architecture of VMs:
A Drivers are part of a specific service VM
B Drivers are part of the Hypervisor
C Drivers are part of the Guest OS
D Drivers are part of the Guest VMs

A

A

27
Q

Downtime is a period of time, or a percentage of a time span, when a system is unavailable or
offline.
A regardless of the cause
B because of system crashes
C none of the other
D because of routine maintenance

A

A

28
Q

What is a Graphical Processing Unit (GPU)?
A A specialized hardware meant to provide storage in a data center
B A specialized hardware meant to support data-parallel computation
C An Internet-of-Things device meant to operate in the field
D A specialized hardware meant to provide networking in a data center

A

B

29
Q

Which is the configuration characterizing the three-layers network architecture of a data-center?
A Sensors – Aggregation – Cloud
B Access - Aggregation – Cloud
C Access – Aggregation – Core
D Access – Fog – Core

A

C

30
Q

Gmail is an example of:
A Software as a Service
B Hardware as a service
C Platform as a Service
D Infrastructure as a service

A

A

31
Q

What is a Data Center?

A None of the others
B A building or portion of a building whose primary function is to research new data.
C A building or a portion of a building whose primary function is to house a computer room
and its related support areas.
D A room in a building dedicated to monitoring data and information

A

C

Computing infrastructures 🔋 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions