FC

• On-Demand Self-Service

• Broad Network Access

• Resource Pooling

• Rapid Elasticity

• Measured Service

• Requires continuous connectivity

• Too high latency

• Bandwidth limitations

• Regulations / privacy requirements

Outskirt of an administrative domain

• 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

• 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

• Data Collection, Analytics & Privacy

• Security

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

• Compliance Requirements

  • Geofencing, data sovereignty, copyright enforcement

• Real-Time

• 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

• 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