Performance degradation

Thijs de Zoete

A condition in which services are not available or performing optimally. We speak of this status went performance measurements fall outside predetermined limits, resulting in a lower quality of service.

Downtime

Thijs de Zoete

Also known as outage duration. Downtime refers to a period of time that a system fails to provide or perform its primary function. Unlike uptime, which is often expressed in a percentage, we express downtime in units of time.

SLA

Thijs de Zoete

Service Level Agreement: the contract between the service provider and the client that documents what services will be delivered, and their quality.

Edge servers

Thijs de Zoete

Edge servers are the servers at the ‘edge’ of a CDN network, and are a provider’s closet asset to the end user – these are the servers in a PoP. The edge server caches and or mirrors content that is otherwise stored on the Origin server.

Origin

Thijs de Zoete

Origin refers to the web server where the ‘original’ content is stored, as opposed to cache servers or edge servers. Though the end-user won’t notice a difference between the original content and its copies, we often use the term Origin to refer to the server that is updated and maintained by the content supplier.

ISP

Thijs de Zoete

Internet Service Provider: the company that provides Internet services to consumers and businesses. 

SSL

Thijs de Zoete

Secure Socket Layer: the secure connection between Internet browsers and websites, over which private data can be safely transmitted. Websites secured with SSL can be identified in the browser by the padlock icon next to the URL.

RUM

Thijs de Zoete

Real User Measurements or Real User Monitoring. Monitoring a property’s performance and availability by placing a Javascript tag on a website which will be loaded during page load. The Javascript code will then perform measurements and send the results back to a server for analysis.

multi-cdn

Thijs de Zoete

The combined networks of existing CDN providers into one larger network.

Throughput

Thijs de Zoete

The amount of bandwidth that is available for the data to travel.