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Comp3100 Cringe ass Final Exam > Cringe > Flashcards

Cringe Flashcards

1
Q

What is the definition of Distributed Systems

A

A distributed system is a collection of autonomous computing
elements that appears to its users as a single coherent system.

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2
Q

What are some characteristic Features of Distributed Systems

A
  • Autonomous computing elements, also referred to as nodes, be
    they hardware devices or software processes.
  • Single coherent system: users or applications perceive a single
    system ⇒ nodes need to collaborate.
  • Its easily expandable, Adding new computers is hidden from users
  • It has continuous availability, Failures in one component can be covered by other components
  • It is supported by middleware
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3
Q

What are some features of Distributed Systems

A
  • No shared memory – message-based communication
  • Each runs its own local OS
  • Heterogeneity
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4
Q

What does a distributed system look like?

A
  • The distributed system “looks like” a single computer rather than a
    collection of separate computers. It Hide internal organization, communication details and Provides a uniform interface
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5
Q

What Goals does Distributed Systems want to accomplish

A
  • Availability (support sharing of resources)
  • Distribution transparency
  • Openness
  • Scalability
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6
Q

What is Goal 1 of Distributed Systems (Resource Availability) Entail?

A
  • Support user access to remote resources (printers, data files, web pages, CPU cycles) and the fair sharing of the resources
  • Economics of sharing expensive resources
  • Performance enhancement – due to multiple processors; also due to ease of collaboration and info exchange – access to remote services
  • Resource sharing introduces security problems.
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7
Q

What is Goal 2 of Distributed Systems (Distribution Transparency) Entail?

A
  • Software hides some of the details of the distribution of system resources. This makes the system more user friendly
  • A distributed system that appears to its users & applications to be a single computer system is said to be transparent. This means that Users & apps should be able to access remote resources in the same way they access local resources.
  • Transparency has several dimensions.
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8
Q

What are the different types of distribution transparency?

A
  • Access: Hide differences in data representation and how an object is accessed
  • Location: Hide where an object is located
  • Relocation: Hide that an object may be moved to another location while in use
  • Migration: Hide that an object may move to another location
  • Replication: Hide that an object is replicated
  • Concurrency: Hide that an object may be shared by several independent users
  • Failure: Hide the failure and recovery of an object
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9
Q

What is Goal 3 of Distributed Systems (Openness) Entail?

A
  • Be able to interact with services from other open systems, irrespective of the underlying environment:
  • Interface Definition/Description Languages (IDL): used to describe the interfaces between software components, usually in a distributed system
  • Interoperability: the ability of two different systems or applications to work together
  • Portability: an application designed to run on one distributed system can run on another system that implements the same interface.
  • Extensibility: Easy to add new components, features
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10
Q

What is Goal 4 of Distributed Systems (Scalability) Entail?

A
  • Dimensions that may scale with respect to size
  • Dimensions that may scale With respect to geographical distribution
  • Dimensions that may scale With respect to the number of administrative organizations spanned
  • A scalable system still performs well as it scales up along any of the three dimensions.
  • Scale-up vs Scale-out
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11
Q

What are pitfalls in relation to the development of distributed systems?

A
  • Many distributed systems are needlessly complex caused by mistakes that required patching later on. Many false assumptions are often made.
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12
Q

What are the many false assumptions made when developing distributed Systems

A
  • The network is reliable
  • The network is secure
  • The network is homogeneous
  • The topology does not change
  • Latency is zero
  • Bandwidth is infinite
  • Transport cost is zero
  • There is one administrator
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13
Q

What are the three types of distributed Systems?

A
  • High performance distributed computing systems (HPDC)
  • Distributed information systems (DIS)
  • Distributed systems for pervasive computing (Pervasive)
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14
Q

What is HDPC in relation to Parallel Computing

A
  • High-performance distributed computing started with parallel computing.
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15
Q

What is HDPC in relation to Cluster computing

A
  • Essentially a group of high-end systems connected through a LAN
  • Homogeneous: same OS, near-identical hardware
  • Single managing node
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16
Q

What is HDPC in relation to Grid computing

A

The next step: lots of nodes from everywhere. These are Heterogeneous, Dispersed across several organizations, Can easily span a wide-area network. Remember, To allow for collaborations, grids generally use virtual organizations. In essence, this is a grouping of users (or better: their IDs) that will allow for authorization on resource allocation.

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17
Q

What is HDPC in relation to cloud computing?

A

Its resource utilisation is: Elasticity, with dynamic resource provisioning. Furthermore its cost efficient as you pay for the servers using PAYG (pay as you go). These servers would be things like AWS or Microsoft Azure.

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18
Q

What is the situation, basic approach and next step of Distributed Information Systems when integrating applications

A
  • Situation: Organizations confronted with many networked applications, but achieving interoperability was painful.
  • Basic approach:
  • A networked application is one that runs on a server making its services available to remote clients. Simple integration: clients combine requests for (different) applications; send that off; collect responses, and present a coherent result to the user.
  • RPC (functions)
  • RMI (Objects)
  • MOM (Publish/Subscribe)
  • Next Step: Allow direct application-to-application communication, leading to Enterprise Application Integration.
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19
Q

What could an example be of a Distributed Information System: Enterprise Application Integration of Nested Transactions

A
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20
Q

How would you integrate applications in a Distributed Information System?

A
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21
Q

What is a Distributed Pervasive System?

A

A Distributed Pervasive System is a network of interconnected devices or nodes, often mobile or embedded in the environment, that seamlessly provide services and exchange information without requiring explicit user commands, thereby integrating computing into the user’s everyday activities and environment. They naturally blend into the user’s environment.
They also have three overlapping subtypes. These are:
- Ubiquitous computing systems: pervasive and continuously present, i.e., there is a continuous interaction between system and user.
- Mobile computing systems: pervasive, but emphasis is on the fact that devices are inherently mobile
- Sensor (and actuator) networks: pervasive, with emphasis on the actual (collaborative)sensing and actuation of the environment.

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22
Q

What are the core elements of a ubiquitous computing system?

A
  1. (Distribution) Devices are networked, distributed, and accessible in a transparent manner
  2. (Interaction) Interaction between users and devices is highly unobtrusive
  3. (Context awareness) The system is aware of a user’s context in order to optimize interaction
  4. (Autonomy) Devices operate autonomously without human intervention, and are thus highly self-managed
  5. (Intelligence) The system as a whole can handle a wide range of dynamic actions and interactions
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23
Q

What are the distinctive features of a mobile computing system?

A
  • A myriad of different mobile devices (smartphones, tablets, GPS devices, remote controls, active badges.
  • Mobile implies that a device’s location is expected to change over time ⇒change of local services, reachability, etc. Keyword: discovery.
  • Communication may become more difficult: no stable route, but also perhaps no guaranteed connectivity ⇒ disruption-tolerant
    networking.
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24
Q

What are the characeristics of a sensor network?

A
  • The nodes to which sensors are attached are: Many (10s - 1000s) and they are Simple (small memory/compute/communication capacity) Often battery-powered (or even battery-less).
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25
Q

What are the three types of System models?

A
  • Physical models: consider the types of computers and devices that constitute a system and their interconnectivity, without details of specific technologies.
  • Architectural models: describe a system in terms of the computational and communication tasks performed by its computational elements; the computational elements being individual computers or aggregates of them supported by appropriate network interconnections. Client-server and peer-to-peer are two of the most commonly used forms of architectural model for distributed systems.
  • Fundamental models take an abstract perspective in order to describe solutions to individual issues faced by most distributed systems.
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26
Q

How do physical models work?

A
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27
Q

How do Architectural Models work?

A

They work under the framework WWHP. This stands for:
- Who: who is communicating?
- How: How to communicate?
- What: What are the roles and responsibilities?
- Placement: How the processes are mapped to physical infrastructure?

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28
Q

What is Architectural Models - who?

A
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29
Q

What is Architectural Models - how?

A
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30
Q

What is Architectural Models - What?

A
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31
Q

What is Architectural Models - Placement?

A
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32
Q

What is architectural styles?

A

A style is formulated in terms of (replaceable) components with well-defined interfaces the way that components are connected to each other the data exchanged between components. It is also formulated in terms of how these components and connectors are jointly configured into a system.

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33
Q

What is a connector?

A

A mechanism that mediates communication, coordination, or cooperation among components. For Example: facilities for (remote) procedure call, messaging, or streaming.

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34
Q

What does layered Architecture look like?

A
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35
Q

What does Software and hardware service layers in distributed systems look like?

A
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36
Q

What do Two-tier and three-tier architectures look like?

A
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37
Q

What is two-party communication?

A

This is communication between two parties, usually between a server and a client.

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38
Q

What is application layering?

A
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39
Q

What is an example of application layering

A
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40
Q

What is the problem and Solution for using legacy to build middleware?

A
  • Problem: - The interfaces offered by a legacy component are most likely not
    suitable for all applications
  • Solution: A wrapper or adapter offers an interface acceptable to a client application. Its functions are transformed into those available at the component.
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41
Q

What is the problem and Solution for using legacy to build middleware?

A
  • Problem: - The interfaces offered by a legacy component are most likely not
    suitable for all applications
  • Solution: A wrapper or adapter offers an interface acceptable to a client application. Its functions are transformed into those available at the component.
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42
Q

How do you organise wrappers?

A
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43
Q

What is the problem with Developing adaptable middleware

A

Middleware contains solutions that are good for most applications ⇒ you may Developing adaptable middleware want to adapt its behaviour for specific applications.

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44
Q

What are the Centralized system architectures

A
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45
Q

What are some Multi-tiered centralized system

A
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46
Q

What are the Alternative organizations

A
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47
Q

What is Structured P2P?

A
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48
Q

What is Unstructured P2P?

A
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49
Q

What is Flooding versus random walk

A
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50
Q

What is Super-peer networks? These are also called Organzied P2P

A
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51
Q

What is Edge-server architecture?

A
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52
Q

What is Collaboration In terms of The BitTorrent case

A
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53
Q

What are the 3 fundamental models?

A
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54
Q

What does the basic networking model look like?

A
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55
Q

What are the Low- Level Layers?

A
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56
Q

What is the transport layer?

A
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57
Q

What is the Middleware Protocols

A
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58
Q

what does An adapted layering scheme look like?

59
Q

What is Message-oriented middleware?

60
Q

What is Basic RPC operation

61
Q

What is RPC: Parameter passing

62
Q

What is Asynchronous RPCs

63
Q

What is Multicast RPC

64
Q

What is Client-to-server binding (DCE)

65
Q

What is Message-oriented middleware

66
Q

What is a general model

67
Q

What is a Message broker

68
Q

What does the general architecture look like for a Message broker

69
Q

What is an Identifier

70
Q

What is Broadcasting

71
Q

What is Forwarding pointers

72
Q

What is Hierarchical Location Services (HLS)

73
Q

What is HLS: Tree organization

74
Q

What is HLS: Lookup operation

75
Q

What is a Name space

76
Q

What is a Name resolution

77
Q

What is synchronisation

78
Q

What is coordination

79
Q

What is the Impact of Clock Synchronization

80
Q

What is the Atomic Time System

81
Q

What is UTC

82
Q

How do Clocks in a Distributed System work?

83
Q

What does a Perfect network look like?

84
Q

What does a Synchronous network look like

85
Q

What is the Berkeley algorithm?

86
Q

What is Logical Time?

87
Q

What is Mutual exclusion

88
Q

What is Permission-based, centralized mutual exclusion?

89
Q

What is Mutual exclusion: Token ring algorithm

90
Q

What is Election algorithms

91
Q

What is Election by bullying

92
Q

What is Election in a ring

93
Q

What does Graph-based Leader Election look like?

94
Q

What is Dependability - ARMS

95
Q

Explain Reliability versus availability

96
Q

What are the THREE TYPES OF FAULTS

97
Q

What are the types of failures

98
Q

What is Dependability versus security

99
Q

What is Halting failures

100
Q

What is Redundancy for failure masking

101
Q

What is Process resilience

102
Q

What is Consensus under arbitrary failure semantics

103
Q

What is a flooding based algorithm

104
Q

What is Paxos?

A

Paxos is realistic, very difficult to implement, and very complex. Solution - Never execute an operation before it is clear that It has never been learned.

105
Q

What is a distributed file system?

106
Q

What is DFS: Architecture

107
Q

What are Mechanisms for DFS

108
Q

What is Mounting

109
Q

What is caching?

110
Q

What are the two types of virtulisation types?

A
  • Full virtualization: No OS source modification
  • Para-virtualization: “slight” OS source modification
111
Q

What is Full virtualization

112
Q

What is Paravirtualization

113
Q

What are the Hypervisor types

114
Q

What is Type-1 Hypervisor: Xen

115
Q

What is Type-2 Hypervisor: KVM

116
Q

What is QEMU

117
Q

What is QEMU

118
Q

What is Container virtualization

119
Q

What are Linux Containers

120
Q

What are Docker containers

121
Q

What are the specifications of Server/VM migration

122
Q

How to Migrate a VM

123
Q

What are the Virtualization challenges

124
Q

What are the Types of cluster

125
Q

What is Parallel programming

126
Q

What is Cluster middleware

127
Q

What are the Characteristics/benefits of cluster middleware

128
Q

What is A Grid

129
Q

What are the Types of Grid

130
Q

Data centres (DCs): what is a server?

131
Q

What are DCs: compact servers

132
Q

What are the DC Components

133
Q

Why Move to Cloud Computing?

134
Q

How does cloud computing address economies of scale, Data centre consolidation, Improved utilisation, Improved cost efficiency

135
Q

What are the Cloud (representative) service types

136
Q

What is cloud stack

137
Q

What are the Cloud stack and service types

138
Q

What are the Cloud deployment models

139
Q

What is RCS

140
Q

What is availability and security in the public cloud?

141
Q

Availability in the public cloud: why is it so important?

142
Q

What is Perimeter-based Security

143
Q

What is Zero-trust Security

Comp3100 Cringe ass Final Exam (1 decks)

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