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Distributed operating systemsThe security service allows clients and servers to authenticate each other and perform authenticated RPC. The heart of the security system is a way for clients to be authenticated and receive PACs without having their passwords appear on the network, not even in encrypted form. PACs allow clients to prove who they are in a convenient and foolproof way. Finally, the distributed file system provides a single, system-wide name space for all files. A global file name consists of a cell name followed by a local name. The DCE file system consists (optionally) of the DCE local file system, Episode, plus the file exporter, which makes all the local file systems visible throughout the system. Files are cached using a token scheme that maintains the traditional single-system file semantics. Although DCE provides many facilities and tools, it is not complete and probably never will be. Some areas in which more work is needed are specification and design techniques and tools, debugging aids, runtime management, object orientation, atomic transactions, and multimedia support. PROBLEMS 1. A university is installing DCE on all computers on campus ...» |
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