IT Shared Services Catalog | 84  The available storage tiers’ costs vary by data accessibility rates. Higher availability rates have higher costs while lower availability rates have lower costs. Agencies should perform data accessibility studies on the data they plan to host using Cloud Enterprise Storage before any cloud migration to determine which storage tiers are appropriate for their data. Network Interconnect  Cloud network services include network egress, load balancing, application gateway and firewalls.  Services also include VPN gateway, cloud interconnects, CDN, DNS and traffic management, as well as DDoS protection and IP addressing. Relational Database  Agencies may choose the type of database instance they would like to launch. Agencies are cautioned to appropriately size database instances to best fit their needs within their projected costs model before launching a cloud instance. Virtual Server  Leveraging the state cloud management platform, agencies may provision virtual servers (e.g., AWS EC2 instances).  These servers come in a variety of sizes, each with different pricing models to accommodate diverse use cases and applications.  IT Shared Services agencies select from a variety of VM images with hardened Windows Server or Red Hat Enterprise Linux operating systems and required agent software pre-installed. Virtual Desktop  Virtual Desktop provides virtualization of the Windows operating system, including virtualized desktops and applications in the cloud.  Regardless of your device type (Windows, Mac, iOS, Android or any other device with an HTML5 web client) bring-your-own-device (BYOD) and remote connect to your enterprise experience. Web Hosting  Static and dynamic websites can be deployed as a PaaS offering. Resources can be automatically scaled up or down based on the usage.