DS Summary at Frankfurt University Of Applied Sciences | Flashcards & Summaries

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A distributed system is system with:

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a. Hard and software components
b. Based on different but connected computers

c. Communicate with each other based on a specific protocol

d. Interchange message with each other

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Examples of Distributed Systems

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Cloud Computing, E-Commerce, Internet

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Advantages of Distributed Systems

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a. Cost effectiveness (Mircroprocessor have a better cost/performance ratio than legacy systems)

b. Performance & Reliability (Better performance, the blackout of one component does not lead in a blackout of the whole system)

c. Scalability & Flexibility (Incremental increase/decrease of the computing power are possible as well as load balance)

d. Inherent distributing (No one is the owner of a distributed system)

e. Shared Data & Peripheral (Using shared data and expensive peripherals, like printers)

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Disadvantages of Distributed Systems

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a. Hardware (Low cost componentes usually have a worse quality so a blackout is much more possible)

b. Software (Complexity will increase, you have to care about distributes responsibility)

c. Network (Bottleneck, possible loss of data)

d. Security (Hacker attacks are possible, harder to manage, distributes responsibility)

e. Consistency (You have to take care that data is up-to-date)

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Requirements for distributed systems

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a. Scalability (1. The ability of a computer application or product to continue to function well as it is changed in size or volume in order to meet a user's need 

2. Distributed systems have to be designed so that bottlenecks do not occur 

3. Horizontal scalability: adding server to the network, Vertical scalability: extending an existing server )

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General transparency

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A system is transparent if changes stick to previous external interfaces as much as possible while changing its internal behaviour

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Transparency in context of distributed systems

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Means that any form of distributed system should hide its distributed nature from its users, appearing and functioning as a normal centralized system 

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Scaling Transparency 

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Allows the sytem and applications to expand in scale without change to the system structure or the application algorithm

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Access Transparency 

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Regardless of how resource access and representation has to be performed on each individual computing entity, the users of distributed system should always access resources in a single uniform way

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Location Transparency

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Users of distributed system should not have to be aware of where a resource is physically located

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Migration Transparency

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User should not be aware of whether a resource is physically located

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Distributed Systems definition


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Autonomous computers are part of distributed system, if they are able to solve problem in the network

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Beispielhafte Karteikarten für deinen DS Summary Kurs an der Frankfurt University of Applied Sciences - von Kommilitonen auf StudySmarter erstellt!

Q:

A distributed system is system with:

A:

a. Hard and software components
b. Based on different but connected computers

c. Communicate with each other based on a specific protocol

d. Interchange message with each other

Q:

Examples of Distributed Systems

A:

Cloud Computing, E-Commerce, Internet

Q:

Advantages of Distributed Systems

A:

a. Cost effectiveness (Mircroprocessor have a better cost/performance ratio than legacy systems)

b. Performance & Reliability (Better performance, the blackout of one component does not lead in a blackout of the whole system)

c. Scalability & Flexibility (Incremental increase/decrease of the computing power are possible as well as load balance)

d. Inherent distributing (No one is the owner of a distributed system)

e. Shared Data & Peripheral (Using shared data and expensive peripherals, like printers)

Q:

Disadvantages of Distributed Systems

A:

a. Hardware (Low cost componentes usually have a worse quality so a blackout is much more possible)

b. Software (Complexity will increase, you have to care about distributes responsibility)

c. Network (Bottleneck, possible loss of data)

d. Security (Hacker attacks are possible, harder to manage, distributes responsibility)

e. Consistency (You have to take care that data is up-to-date)

Q:

Requirements for distributed systems

A:

a. Scalability (1. The ability of a computer application or product to continue to function well as it is changed in size or volume in order to meet a user's need 

2. Distributed systems have to be designed so that bottlenecks do not occur 

3. Horizontal scalability: adding server to the network, Vertical scalability: extending an existing server )

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Q:

General transparency

A:

A system is transparent if changes stick to previous external interfaces as much as possible while changing its internal behaviour

Q:

Transparency in context of distributed systems

A:

Means that any form of distributed system should hide its distributed nature from its users, appearing and functioning as a normal centralized system 

Q:

Scaling Transparency 

A:

Allows the sytem and applications to expand in scale without change to the system structure or the application algorithm

Q:

Access Transparency 

A:

Regardless of how resource access and representation has to be performed on each individual computing entity, the users of distributed system should always access resources in a single uniform way

Q:

Location Transparency

A:

Users of distributed system should not have to be aware of where a resource is physically located

Q:

Migration Transparency

A:

User should not be aware of whether a resource is physically located

Q:

Distributed Systems definition


A:

Autonomous computers are part of distributed system, if they are able to solve problem in the network

DS Summary

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