DISTRIBUTED SYSTEMS EXAM 1 QUESTIONS AND
ANSWERS
What year was the term "middleware" first used to describe software that
functions between applications software and OS services?
1968
access transparency
distribution transparency that's responsible for hiding differences in data
transparency and object accessibility between machines or operating software
failure transparency
transparency that hides the failure of a system component from the end user or
application and immediately recovers
location transparency
users cannot tell where an object is physically located in a system
concurrency transparency
transparency that allows users to utilize the same resource without noticing any
of the other users
replication transparency
transparency that hides that several copies of a resource exist or that several of
the same process exist to cover if any fail
migration transparency
supports the mobility of processes and resources utilized by users without
impacting on-going communication or processes
relocation transparency
hide that an object or resource may be moved to another location while in use
the authors claim that increase in openness results in a proliferation of
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ANSWERS
What year was the term "middleware" first used to describe software that
functions between applications software and OS services?
1968
access transparency
distribution transparency that's responsible for hiding differences in data
transparency and object accessibility between machines or operating software
failure transparency
transparency that hides the failure of a system component from the end user or
application and immediately recovers
location transparency
users cannot tell where an object is physically located in a system
concurrency transparency
transparency that allows users to utilize the same resource without noticing any
of the other users
replication transparency
transparency that hides that several copies of a resource exist or that several of
the same process exist to cover if any fail
migration transparency
supports the mobility of processes and resources utilized by users without
impacting on-going communication or processes
relocation transparency
hide that an object or resource may be moved to another location while in use
the authors claim that increase in openness results in a proliferation of
______________________
