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This Concept Map, created with IHMC CmapTools, has information related to: ch2 arch desi, Some of those challenges include: Caching and Replication One tool for increasing throughput, availability and time critical sensitivity is storing extra copies of data in memory (caching) or on a local disk (replication). Data stored can be small (translated web addresses) or large (multiple copies of corporate databases). There are many challenges in managing data that can be changed in one place while having copies in other places., Some of those challenges include: Performance issues are Responsiveness: Users want both speed and consistency. Throughput: IT systems are expensive, and are often sold on the basis of their ability to perform the most work for the least money. Load balancing: High potential throughput can be defeated if the work is not distributed to make maximum use of potential because some of the system is idle., Some of those challenges include: Quality of service Performance is one aspect of quality of service. Others include: Reliability: this includes availability (“uptime”) and freedom from errors. Security: this is protection from compromise or loss of information or investment. Time Criticality: some information must be available in the right place at the right time. This is a major concern in designing networks., Some of those challenges include: Dependability Correctness is ensuring that data is current and accurate. Fault tolerance is ensuring that when something goes wrong, the system can recover or bypass the fault rapidly without loss of information. Security includes identifying users, determining privileges and protection of systems and data., Design requirements for distributed architectures There are many challenges in designing computer systems. Some of those challenges