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Computing Infrastructures > Closed Questions > Flashcards

Closed Questions Flashcards

1
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

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2
Q

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

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

A

C

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3
Q

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

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

A

A

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4
Q

What is a hybrid cloud computing system?

A - a cloud used for a single organization
B - a cloud whose energy is produced both by diesel and batteries
C - a cloud shared by several organization
D - a cloud composed by private and public cloud systems

A

D

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5
Q

Paravirtualization cannot be used with unmodified OS

True or False

A

True

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6
Q

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

True or False

A

False

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7
Q

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

True or False

A

False

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8
Q

In datacenter storage context, DAS means Distributed Application Storage

True or False

A

False (Direct Attached Storage)

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9
Q

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

True or False

A

True

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10
Q

What is a Network Attached Storage (NAS)?

A - a storage system directly attached to a server or workstation

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

C - a remote storage unit connected to PC using a specific networking technology

D - a computer connected to a network that provides computation to other devices

A

B

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11
Q

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

A - none of the other

B - because of routine maintenance

C - because of system crashes

D - regardless of the cause

A

D

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12
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

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13
Q

Which definition is not encompassed by Dependability:

A - Reversibility: ability to reverse a broken service

B - Reliability: continuity of correct service

C - Maintainability: reparation to restore correct service

D - Availability: readiness for correct service

A

A

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14
Q

Racks shelves may contain switches

True or False

A

True

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15
Q

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

True or False

A

False

In Solid State Drives (SSDs), the smallest units that can be written or read are typically referred to as “pages,” not blocks. However, SSDs manage data internally in blocks, which consist of multiple pages. So, while pages are the smallest units that can be written or read, blocks are important for the internal management of data within an SSD.

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16
Q

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

True or False

A

False

17
Q

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

True or False

A

False

RBD may not always precisely match the physical or logical structure of the modeled system. Sometimes, for the sake of analysis or simplicity, the RBD may abstract or combine certain components or subsystems. Additionally, the RBD may include redundancy or mitigation strategies that are not explicitly present in the physical system but are included for reliability analysis purposes.

18
Q

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

True or False

A

True

19
Q

Edge computing can improve the performance and reduce the latency of applica- tions by reducing the distance data has to travel.

True or False

A

True

20
Q

The Internet of Things (IoT) layer is part of the computing continuum.

True or False

A

True

21
Q

NASs can provide high-speed, low-latency access to storage resources for applica- tions that require fast access to data.

True or False

A

False

22
Q

Cooling towers use cold water to remove heat and to function effectively.

True or Flase

A

False

23
Q

A PUE of 1.0 means that all of the power consumed by a data center is being used by the IT equipment.

True or False

A

True

24
Q

DAS devices are typically shared by multiple servers.

True or False

A

False

25
Q

FPGAs are more power-efficient and offer higher performance compared to CPUs for certain types of workloads

True or False

A

True

26
Q

Full virtualization provides better performance than paravirtualization.

True or False

A

False

27
Q

Closed loop cooling systems are not suitable for high-density datacenters where heat dissipation is critical.

True or False

A

False

28
Q

Cloud architectures are designed to provide on-demand access to shared computing resources.

True or False

A

True

29
Q

Hot/cold aisle containment reduces the efficiency of the cooling method for data-centers

True or False

A

False

30
Q

Edge computing is not a suitable alternative to cloud computing for applications that require large-scale data processing.

True or False

A

True

31
Q

RAID 0 provides the best read and write performance of any RAID level composed of the same amount of disks.

True or False

A

True

32
Q

Datacenters within the same Geographic Areas share the same power and network infrastructure

True or False

A

False

33
Q

TOR switches are typically used in small-scale datacenter deployments and are not suitable for larger networks.

True or False

A

False

34
Q

Virtualization can help reduce energy consumption by consolidating multiple physical machines into fewer physical ones.

True or False

A

True

35
Q

POD, Virtual-Chassis, DCell and BCube models are all evolutions of the leaf-spine network architectures.

True or False

A

False

36
Q

Type 2 hypervisors run on top of a guest operating system that provides indirect access to hardware resources.

True or False

A

False

37
Q

In-row cooling systems allow for higher server densities and increased rack power densities in datacenters.

True or False

A

True

38
Q

DAS (Direct Attached Storage) is a storage system directly attached to the datacenter network.

True or False

A

False

Computing Infrastructures (9 decks)

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