[Cloud Computing and Data Center Planning] [Final Review Questions] [Autumn 2022]

Question count: 41 Full score: 100.0

1. Multiple choice questions (7 questions in total)

1. Which of the following virtual machine systems can be installed independently on the computerhardwareAbove, no other operating system is needed
A.VMware Workstation
XenServer
VPC

2.DockerThe difference from KVM and Xen virtualization is
A. Fast startup, small resource usage, based on linux container technology
Belongs to semi-virtualization
Belongs to semi-virtualization
Belongs to lightweight virtualization

3. What is dockerVirtualization technology
It's a virtual machine, a virtual machine
It is a heavyweight virtualization technology
It's a paravirtualization technology
It is an open source application container engine

4. The following is not a computer room grade A-level in GB 50174-2017
A. Interruption of the operation of electronic information system will cause significant economic losses
B. Interruption of the operation of electronic information systems will cause serious disorder in public places
C. The site facilities in the electronic information system computer room should be configured according to redundant requirements. During the system operation, the site facilities are within the redundant capacity and should not cause interruption of the electronic information system operation due to equipment failure.
D. The site facilities in the electronic information system computer room should be configured according to the fault-tolerant system. During the operation of the electronic information system, the site facilities should not be interrupted due to operational errors, equipment failures, external power interruptions, maintenance and maintenance.

/The correspondence between EIA-942 computer room grading and GB 50174-2017 computer room grading, the wrong one is
Tier4 corresponding to TIA/EIA-942
Tier2 corresponding to TIA-942
Tier1 corresponding to TIA-942
3 Basically classified as B.

6. Regarding the statements on GB 50174-2017 computer room classification and TIA/EIA-942 computer room classification, the correct one is
50174-2017 Grading the computer room to four levels A B C D
B.Tier942 classifies the computer room four levels: TIA-A, TIA-B, TIA-C, and TIA-D.
50174-2017 Classification of computer rooms in one, two, three levels
D.Tier942 classifies the computer room four levels: TIA1, TIA2, TIA3 and TIA4.

7. Regarding energy efficiency management, the following statement is correct:
A. Energy saving requires reducing energy use and energy consumption
B. From the perspective of data center operation and use, the energy efficiency of a data center can be broadly defined as the ratio of the computing tasks performed by the data center server to the total energy consumed during the task execution.
C. A typical data center, the core IT equipment, including computing, storage, network, etc., will definitely consume more than half of the energy consumption of the entire data center.
D. The lower the ambient temperature setting of the data center, the more energy-saving it is.

2. Multiple choice questions (15 questions in total)

1. Which of the following components are included in the virtual infrastructure
A. Bare Metal Management Program
B. Virtual infrastructure services
Centralization of resource management
D. Several automation solutions

2. Which of the following architectural models are usually included in server virtualization?
A. Host Model (OS-Hosted VMM)
B. Native Architecture Model (Hypervisor VMM)
C. Hybrid Model (Hybrid VMM)
Virtual Machine Model

3. Which of the following statements are incorrect
-V's system architecture has two modes and two partitions
B. Install the Guest Host host in the child partition in user mode to provide services to the parent partition
C. User mode is an external working mode based on the support of kernel mode.
D. Kernel mode isWindowsOperating system kernel andComputer hardwareThe collaborative working mode provides services to the user mode

4. Common types of virtualization are
A. Server virtualization
B. Desktop virtualization
C. Storage virtualization
D. Network virtualization and application virtualization

5. In the x86 architecture, which of the following methods are for virtualization of CPU privileged instructions
A. CPU virtualization technology based on simulation execution
B. CPU virtualization technology based on operating system assistance
C. Hardware-assisted CPU virtualization technology
D. Software-assisted CPU virtualization technology

6. The basic three-layer architecture of cloud computing is
as a Service (SaaS)
as a Service (XaaS)
as a Service (IaaS)
as a Service (PaaS)

7. The following measures can effectively reduce energy consumption.
A. Airflow structure, minimize the mixing of hot airflow with the cold airflow that has not passed through the equipment, and the path from the indoor unit to the working point is as short as possible, thereby reducing transmission losses.
B. Increase the cold channel temperature, which can increase the cold channel temperature from 18 °C to 20 °C to 27 °C. A higher cold channel temperature can increase the temperature of the frozen water, thereby reducing the working time of the host.
C. Using natural cooling technology, for example, the cooling tower adopts a natural evaporation and heat dissipation mode, which can greatly reduce the energy consumption of the chiller unit. Google's computer rooms in Belgium even 100% utilizes natural cooling technology.
D. Try to shorten the transmission distance between high-voltage power supply and equipment to reduce line loss

8. The following are the goals of data center construction
A. Efficient, green, energy-saving
B. Stable, safe and reliable
C. Unified integration and centralized management
D. Standard extensible

9. In the process of site selection of data centers, factors that need to be considered are:
A. Ensure power supply, smooth communication and convenient transportation
B. Stay away from noise sources and strong electromagnetic field interference
C. Natural disasters
D. Stay away from residential or commercial areas

10. Which of the following aspects need to be paid attention to during the decoration process of data center
A. Anti-static, dustproof,
B. Anti-radiation and anti-shock
C. Waterproof, moisture-proof, lightning-proof, fire-proof,
D. Noise protection

11. The following statement about lightning is correct
A. The damage caused by lightning to the data center is reflected in the lightning strike and fire.
B. Lightning is divided into induction lightning and direct lightning
C. Direct lightning strikes are relatively harmful, and induction lightning damage can be ignored.
D. Prevent direct lightning strikes, and lightning rods are enough

12. The following statements about the IaaS service model of cloud computing are correct.
Provides computing resources and infrastructure services close to bare metal
The key technology and solution is virtualization technology
A typical representative is AWS
Provides an environment for developers to build applications

13. The following statement about PaaS is correct
It is a business model that provides the operation and development environment of application services as a service
B. Distributed parallel computing is a key technology for PaaS
C. Large file distributed storage is a key technology in PaaS
AppEngine is a typical PaaS application

14. The following statement about SaaS mode is correct
It is a cloud service provided to individuals
The key technology is multi-tenant technology
Can be based on PaaS or can be directly deployed on IaaS
The main users are developers

15. The following statement about cloud computing deployment model is correct
A. Public cloud is a cloud computing service for the Internet public
B. The main purpose of private cloud is to provide more reliable and flexible services within the enterprise.
C. In the early stage of building a private cloud, a large amount of investment is required for enterprises.
D. Public cloud has economies of scale and has relatively low operating costs

3. Fill in the blanks (7 questions in total)

1. The two channels stored are () channel and () channel.

data

manage

2. Common network virtualization applications include ( ) and ( ).

Virtual LAN/VLAN

Virtual Private Network/VPN

3. List three technical foundations of cloud computing (), (), and ().

Virtualization

Distributed computing

parallel computing

Grid calculation

Utility calculation

4. The main functions of virtualization include (), (), and ().

Partition

isolation

Package

5. List three cloud computing deployment models (), (), and ().

Public cloud

Private Cloud

Hybrid Cloud/Alliance Cloud

6. List two IaaS cloud computing products ( ) and ( ).

Alibaba Cloud

AWS

7. List 3 SaaS products ( ), ( ), ( )

Baidu Cloud Disk

Tencent Cloud Documentation

Zoom

4. Judgment questions (5 questions in total)

30. In the host model of server virtualization, physical resources are managed by the virtual machine monitor.
A. Right
B. Wrong

31. In the host model of server virtualization, all virtualization functions are provided by the virtual machine monitor.
A. Right
B. Wrong

32. In the host model of server virtualization, the virtual machine monitor can directly call the host's resources to realize the virtualization of processor, memory and I/O devices.
A. Right
B. Wrong

33. In the host model of server virtualization, after the VMM creates a virtual machine, it usually participates in scheduling as a process of the host operating system.
A. Right
B. Wrong

34. In the host model of server virtualization, the security of the virtual machine depends not only on the security of the VMM, but also on the security of the host operating system.
A. Right
B. Wrong

5. Short answer questions (7 questions in total)

35. Briefly describe the advantages of virtualization

(1) Improve utilization efficiency.
(2) Easy to isolate applications.
(3) Save overall costs.
(4) It is flexibility and adaptability.
(5) SupportHigh availability。
(6) Have disaster recovery capabilities.
(7) Improve management efficiency.
(8) Simplify data center management and can be used to build software-defined data centers.

36. What is virtualization and what is a virtual machine?

Virtualization refers to the computing components running on a virtual rather than real basis, and use "virtual" software to replace or simulate "real" servers, CPUs, networks and other hardware products. Virtualization is also a process of creating software-based or virtual (rather than physical) representations for some components. Virtualization transforms physical resources into manageable logical resources to eliminate isolation between physical structures and blend physical resources into a whole.
A virtual machine refers to a simulated computer in an operating system running on a physical computer, which is theoretically equivalent to an entity. Each virtual machine can install its own operating system or application and connect to the network. Virtual machines usually have an operating system, virtual resources and hardware, and their management methods are basically the same as those of physical machines. Each virtual machine has some virtual devices that provide the same functionality as physical hardware and are more portable, safer, and easier to manage.

37. From the perspective of physical resource management, virtual machine management, host and virtual machine operating system, briefly describe the characteristics and advantages and disadvantages of the host model in server virtualization.

Physical resources are managed by the host operating system.
VMM obtains resources by calling the services of the host operating system, realizing the virtualization of processors, memory and I/O devices.
Host and virtual machine operating systems are traditional operating systems, such as Windows,Linuxetc., do not have virtualization functions.
All virtualization functions are provided by VMM. After the VMM creates a virtual machine, it usually participates in scheduling as a process of the host operating system.

Advantages: You can make full use of the device drivers of existing OS. VMMs do not need to implement a large number of device drivers themselves, and can easily achieve I/O device virtualization.
Disadvantages: Because resources are controlled by Host OS, VMM needs to call Host OS services to obtain resources for virtualization, and its efficiency and functions will be affected to a certain extent. The security of virtual machines depends not only on the security of VMM, but also on the security of the host operating system.

38. How many levels of mapping are used in memory virtualization technology, and what are the differences? Who is responsible for the maintenance and management?

Using two-level mapping

The guest operating system maintains the mapping from virtual memory to physical memory (page table)
VMM maintains mapping from physical memory to machine memory (shadow page table)

39. In addition to technical constraints, what factors need to be considered when selecting a cloud computing data center?

First, geographical location, natural conditions, and natural environment. It should be kept away from areas prone to natural disasters such as earthquakes, typhoons, floods, etc.
The weather conditions are comfortable and stable, and the environment is clean; it should be as convenient as possible rather than remote, and its geographical location should be conducive to transportation and communication.

Second, social and local human resources conditions. It mainly examines the local economic and cultural development level, science and technology education environment, transportation convenience conditions, human resources supply and level. As a concentrated reflection of information technology, data centers have very high requirements for various social resources.

Third, local water, electricity and gas supporting facilities. The business characteristics of the data center and its quality and capacity requirements determine the data center's requirements for local power supply capacity, and the power supply must be sufficient and stable.

Fourth, cost factors for construction and operation. For a construction project, cost must be a factor that must be weighed repeatedly. Costs involve local planning and land prices, house construction prices, rental and property prices, network communication costs, electricity prices, water prices, labor costs and local consumption levels.

Fifth, the surrounding environmental conditions of the location. The site selection should avoid factories and warehouses that produce dust, oil fume, harmful gases, and produce or store corrosive, flammable, and explosive products, and stay away from highways and railways above 1,500m to avoid the impact of vibration on the host.

Sixth, policy environment, policies provided by local governments. A good policy environment will help the formation of a base climate and promote customer selection and settlement.

40. What is UPS and what is its function?

Uninterruptible Power System, called "uninterruptible power system" or "uninterruptible power supply system"
The UPS will ensure that the output is stable, pure, uninterrupted sine wave AC voltage, so that the computer system can work properly.

41. Please classify the X86 server from the chassis structure and appearance, node density, number of supported CPUs, and functional dimensions.

Classified by chassis structure and appearance: tower server, rack server.

Classified by node density: single-node server, two-node server ("Gemini"), "Four-sub-star", "Eight-sub-star", etc., four nodes or more, and the density of a single server is four nodes or more, which is called a high-density server; blade machines are a type of high-density server.

Classified by the number of supported CPUs: Single-channel server: a server that supports only one CPU; Multi-channel server: a server that supports dual-channel or above is collectively called a multi-channel server.

Classified by function: file server, database server, mail server, web server, DNS server.

Reference

Major in Data Science and Big Data Technology - Cloud Computing ●Virtualization Course Final Review Paper and its Short Answer (1)

Major in Data Science and Big Data Technology - Cloud Computing ●Virtualization Course Final Review Paper and its Short Answer (2)

Electronic information room design and construction specifications/Zhihu@Information System