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Erstellt / Aktualisiert 28.11.2020 / 17.07.2021
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Cloud Computing Characteristics (NIST)

  • On-Demand Self-Service

  • Broad Network Access

  • Resource Pooling

  • Rapid Elasticity

  • Measured Service

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Why is cloud computing not enough?

  • Requires continuous connectivity

  • Too high latency

  • Bandwidth limitations

  • Regulations / privacy requirements

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What is the edge?

Outskirt of an administrative domain

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What is Fog Computing?

What does it provide?

  • Extension of the cloud model

    • applications can reside on multiple layers of a networks' topology

  • Combining cloud resources with edge devices and potential intermediary nodes in the network

 

  • Provides the ability to analyze data near the edge for

    • improving efficiency or

    • to operate while disconnected from a larger network

  • Cloud service can be used for tasks that require mode resources or elasticity

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Fog Computing Characteristics

  • Runs required computations near the end-user

  • Uses lower latency storage at or near the edge

  • Uses low latency communication

  • Implements elements of management

  • Uses Cloud for strategic tasks

  • Multi-tenancy on a massive scale is required for some use cases

  • Geo Distributed

    • Physical location is significant

    • A dynamic pool of sites => unreliable connections between sites

    • Sites may be resource-constrained

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In which areas does Fog Computing benefit?

  • Data Collection, Analytics & Privacy

  • Security

    • Moving security closed to the edge => higher performance security applications

  • Compliance Requirements

    • Geofencing, data sovereignty, copyright enforcement

  • Real-Time

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Challenges to Adoption of Fog Computing (inherent)

  • General

    • They result from the very idea of using fog resources

    • Technical constraints

      • limits of computational power

    • Logical constraints

      • tradeoffs in distributed systems

    • Market constraints

      • there are currently no managed edge services

  • No Edge Services

  • Lack of Standardized Hardware

  • Management Effort

  • Managing QoS

    • IoT or autonomous cars have stronger quality requirements

    • More problems (network latency/partitioning, message loss/reordering) in non-centralized systems

  • No Network Transparency

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Challenges to Adoption of Fog Computing (external)

  • General

    • The result from external entities

    • Government agencies

    • Attackers

  • Physical Security

    • E.g attaching hardware on top of street light pole instead of eye level

    • Protection against fire and vandalism

  • Legal and Regulatory Requirements

    • Data needs to be held in a certain physical location (eHealth)

    • Liquid Fog-based applications might have trouble fulfilling certain aspects of privacy regulations