© 2004 Cisco Systems, Inc. All rights reserved. ARCH v Module Summary An enterprise requires its network to be highly available to ensure that its mission-critical applications are available. Increased availability is a measurable quantity that translates into real cost savings. When designing a network for high availability, consider the reliability of each network hardware and software component, redundancy, protocol attributes, circuits and carriers, and environmental and power features that contribute to the overall availability of the network.