Are you actively monitoring your WAN service level agreement? Uptime is also a common metric that is often used for data services such as shared hosting, virtual private servers and dedicated servers. General agreements include network availability percentage, operating time, number of planned maintenance windows, etc. Because applications are moved from dedicated hardware to the cloud, they must reach the same level of service, or even more sophisticated than conventional installations. SLAs for cloud services focus on data center features and more recently include network features (see Carrier`s Cloud) to support end-to-end SLAs.  How does an ALS differ from a contract? The main difference is that contracts can be entered into without indicating service levels. While it is unlikely that most companies will meet regularly with service providers to report on performance under a standard contract, the level of service agreement involves a negotiated agreement, regular evaluation, strong communication and the possibility of adaptation.