Discussion Questions from CS 5523 Lecture 28: Review of Chapters 8 and 9, Study notes of Operating Systems

Download Discussion Questions from CS 5523 Lecture 28: Review of Chapters 8 and 9 and more Study notes Operating Systems in PDF only on Docsity! 1 CS 5523 Lecture 28: Review Questions from Chapter 8 Questions from Chapter 9 Review sheet Discussion Questions from CDK Chapter 8 [CDK 8.1] Why is there no open or close operation in the interface to the flat file service or the directory service. What are the differences between our directory service Lookup operation and the UNIX open? 2 Discussion Questions from CDK Chapter 8 [CDK 8.4] Why should UFIDs be unique across all possible file systems? How is uniqueness for UFIDs ensured? Discussion Questions from CDK Chapter 8 [CDK 8.5] To what extent does Sun NFS deviate from one-copy file update semantics? Construct a scenario in which two user- level processes sharing a file would operate correctly in a single UNIX host but would observe inconsistencies when running in different hosts. 5 Discussion Questions from CDK Chapter 8 [CDK 8.16] How does AFS deal with the risk that callback messages may be lost? Discussion questions from CDK Chapter 9 CDK [9.2] Discuss the problems raised by the use of aliases in a name service, and indicate how, if at all, these may be overcome. 6 Discussion questions from CDK Chapter 9 CDK [9.3] Explain why iterative navigation is necessary in a name service in which different name spaces are partially integrated, such as the file naming scheme provided by NFS. Discussion questions from CDK Chapter 9 CDK [9.4] Describe the problem of unbound names in multicast navigation. What is implied by the installation of a server for responding to lookups of unbound names? 7 Discussion questions from CDK Chapter 9 CDK [9.8] Why do DNS root servers hold entries for two-level names such as yahoo.com and purdue.com, rather than one-level names such as edu and com? Discussion questions from CDK Chapter 9 CDK [9.9] Which other name server addresses do DNS name servers hold by default, and why?