60 WebSphere Application Server V8.5 Concepts, Planning, and Design Guide
The gateway acts as a proxy so that gateway service users do not need to know whether the
underlying service is being provided internally or externally. The gateway provides a single
point of control, access, and validation of web service requests. It can be used to control
which web services are available to groups of web service users.
2.6 Clusters and high availability
A cluster is a collection of servers that are managed together. With clusters, enterprise
applications can scale beyond the amount of throughput that can be achieved with a single
application server. Also, enterprise applications are made highly available because requests
are automatically routed to the ...