OS DISTRIBUTED SYSTEMS EXAM QUESTIONS
AND ANSWERS
distributed system - ANSWER A ____________________ is a
collection of processors that do not share memory or
a clock. Instead, each node has its own local memory. The nodes
communicate
with one another through various networks, such as high-speed buses
and the
Internet
s processors, sites, machines, and hosts (processors in dist sys)
-We mainly use site to indicate the location of a machine and node
to refer to a specific system at a site
4 major reasons**: resource
sharing, computation speedup, reliability, and communication.
resource sharing - ANSWER ________________________ provides
mechanisms for sharing
files at remote sites, processing information in a distributed database,
printing
files at remote sites, using remote specialized hardware devices (such
as a
supercomputer), and performing other operations
computation speedup - ANSWER a distributed system allows us to
distribute
the subcomputations among the various sites. The subcomputations can
be
run concurrently and thus provide _________.
load sharing (in a distributed system) - ANSWER if a
particular site is currently overloaded with jobs, some of them can be
moved
to other, lightly loaded sites. This movement of jobs is called _______ or
job migration. Automated _______, in which the distributed operating
system automatically moves jobs, is not yet common in commercial
systems.
, reliability - ANSWER If one site fails in a distributed system, the
remaining sites can continue
operating, giving the system better ________
communication - ANSWER When several sites are connected to one
another by a _______________________ network,
users at the various sites have the opportunity to exchange information.
At
a low level, messages are passed between systems, much as messages
are
passed between processes in the single-computer message system
discussed
in Section 3.4. Given message passing, all the higher-level functionality
found
in standalone systems can be expanded to encompass the distributed
system.
Such functions include file transfer, login, mail, and remote procedure
calls
(RPCs).
ad- long distance communication
The advantages of distributed systems have resulted in an industry-wide
trend toward downsizing. Many companies are replacing their
mainframes with networks of workstations or personal computers
remote login - ANSWER This command results in the formation of an
encrypted socket connection
between the local machine at UMC, for example, and the "crk.umn.edu"
computer. After this connection has been established, the networking
software
creates a transparent, bidirectional link so that all characters entered by
the user
are sent to a process on "cs.yale.edu" and all the output from that
process is sent
back to the user. The process on the remote machine asks the user for a
login
name and a password. Once the correct information has been received,
the
AND ANSWERS
distributed system - ANSWER A ____________________ is a
collection of processors that do not share memory or
a clock. Instead, each node has its own local memory. The nodes
communicate
with one another through various networks, such as high-speed buses
and the
Internet
s processors, sites, machines, and hosts (processors in dist sys)
-We mainly use site to indicate the location of a machine and node
to refer to a specific system at a site
4 major reasons**: resource
sharing, computation speedup, reliability, and communication.
resource sharing - ANSWER ________________________ provides
mechanisms for sharing
files at remote sites, processing information in a distributed database,
printing
files at remote sites, using remote specialized hardware devices (such
as a
supercomputer), and performing other operations
computation speedup - ANSWER a distributed system allows us to
distribute
the subcomputations among the various sites. The subcomputations can
be
run concurrently and thus provide _________.
load sharing (in a distributed system) - ANSWER if a
particular site is currently overloaded with jobs, some of them can be
moved
to other, lightly loaded sites. This movement of jobs is called _______ or
job migration. Automated _______, in which the distributed operating
system automatically moves jobs, is not yet common in commercial
systems.
, reliability - ANSWER If one site fails in a distributed system, the
remaining sites can continue
operating, giving the system better ________
communication - ANSWER When several sites are connected to one
another by a _______________________ network,
users at the various sites have the opportunity to exchange information.
At
a low level, messages are passed between systems, much as messages
are
passed between processes in the single-computer message system
discussed
in Section 3.4. Given message passing, all the higher-level functionality
found
in standalone systems can be expanded to encompass the distributed
system.
Such functions include file transfer, login, mail, and remote procedure
calls
(RPCs).
ad- long distance communication
The advantages of distributed systems have resulted in an industry-wide
trend toward downsizing. Many companies are replacing their
mainframes with networks of workstations or personal computers
remote login - ANSWER This command results in the formation of an
encrypted socket connection
between the local machine at UMC, for example, and the "crk.umn.edu"
computer. After this connection has been established, the networking
software
creates a transparent, bidirectional link so that all characters entered by
the user
are sent to a process on "cs.yale.edu" and all the output from that
process is sent
back to the user. The process on the remote machine asks the user for a
login
name and a password. Once the correct information has been received,
the
