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Failure Domain

A failure domain encompasses a section of a network that is negatively effected when a device or service experiences a problem.

The size of a failure domain and its potential impact depends on the device or service that is malfunctioning. A large failure domain could be classed as either a single device that provides multiple services or a single service that spans over multiple devices, whereby should one element fail the entire network is negatively impacted.

It is generally considered a best practice to keep a failure domain as small as possible within an environment.

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Stephen Ransome is an IT consultant and network nerd with experience ranging from SMBs to Service Providers, he has a passion for learning new technologies and delivering solutions that count. He has some alphabet soup, including CCIE#41102 and is far more cynical than he should be.