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This Concept Map, created with IHMC CmapTools, has information related to: Chapter 1 Distributed Systems 2, Challenges Variety and difference as applied to: Networks, Computer hardware, Operating systems, Programming languages, Implementation by different developers Heterogeneity, Challenges The presence of multiple users and source of concurrent request to its reource Concurrency, Challenges Detecting failures, Masking failures (retransmit, multiple copies, Tolerating failures, Recovery from failures Redundancy Failure Handling, Challenges Access transparency Location transparency Concurrency transparency Replication transparency Failure transparency Mobility transparency Performance transparency Scaling transparency Transparency, Challenges Can system be extended and re-implemented in various ways Can new resource-sharing services be addedand made available Requires key interfaces to be published Openness, Challenges Three components Confidentiality Integrity Availability Security, Resource Sharing eXtensible Markup Language Describes the structure of a document: Defines new tags: Specifies metadata that lets programs discover document structure XML, Challenges Remains effective when there is significant increase in number of resources and number of users Scalability