DISTRIBUTED SYSTEMS (ch.1) (
EXAM QUESTIONS WITH
100%VERIFIED ANSWERS
There are no differences between middleware and operating systems. - ✔✔F (main
difference is that middleware services are offered in are offered in a networked environment)
Typical middleware services also include:
o Communication
o Transactions:
o Service composition
o Reliability. -
✔✔T
Remote Procedure Calls (RPCs) is an example of communication services offered by
the middleware. - ✔✔T
It is acceptable that a transaction can be only executed partly since distributed systems only
APPEAR to be a single coherent systems and executing transactions is a service offered by
distributed systems. - ✔✔F (transactions must be executed in an all-or-nothing fashion)
Google maps viewing the weather on different locations is an example of an application
making use of services offered by a distributed system. - ✔✔T (making use of service
composition service)
, Middleware cannot offer reliability services - ✔✔F (reliability is one of the services
offered by middlewares)
The design goals of a distributed systems are:
• Resource sharing
• Distribution transparency
• Openness
• Scalability - ✔✔T
Each user must make use of their own copies of resources since distributed systems do not
support multiple accesses to the same resource - ✔✔F (one of the design goals of a
distributed system is that it supports resource sharing)
Resources can only be data files and objects. - ✔✔F (resources can be virtually anything,
but typical examples include peripherals, storage facilities, data, files, services, and networks)
In distribution transparency, an end user would not be able to tell exactly on which computer
a process is currently executing, or even perhaps that part of a task has been spawned off to
another process executing somewhere else. - ✔✔T
We want to hide differences in machine architectures, but more important is that we reach
agreement on how data is to be represented by different machines and operating systems. We
do this to achieve:
A. Location Transparency
B. Failure Transparency
C. Access Transparency
D. Migration Transparency - ✔✔C
We hide where an object is located in order to achieve:
A. Location Transparency
EXAM QUESTIONS WITH
100%VERIFIED ANSWERS
There are no differences between middleware and operating systems. - ✔✔F (main
difference is that middleware services are offered in are offered in a networked environment)
Typical middleware services also include:
o Communication
o Transactions:
o Service composition
o Reliability. -
✔✔T
Remote Procedure Calls (RPCs) is an example of communication services offered by
the middleware. - ✔✔T
It is acceptable that a transaction can be only executed partly since distributed systems only
APPEAR to be a single coherent systems and executing transactions is a service offered by
distributed systems. - ✔✔F (transactions must be executed in an all-or-nothing fashion)
Google maps viewing the weather on different locations is an example of an application
making use of services offered by a distributed system. - ✔✔T (making use of service
composition service)
, Middleware cannot offer reliability services - ✔✔F (reliability is one of the services
offered by middlewares)
The design goals of a distributed systems are:
• Resource sharing
• Distribution transparency
• Openness
• Scalability - ✔✔T
Each user must make use of their own copies of resources since distributed systems do not
support multiple accesses to the same resource - ✔✔F (one of the design goals of a
distributed system is that it supports resource sharing)
Resources can only be data files and objects. - ✔✔F (resources can be virtually anything,
but typical examples include peripherals, storage facilities, data, files, services, and networks)
In distribution transparency, an end user would not be able to tell exactly on which computer
a process is currently executing, or even perhaps that part of a task has been spawned off to
another process executing somewhere else. - ✔✔T
We want to hide differences in machine architectures, but more important is that we reach
agreement on how data is to be represented by different machines and operating systems. We
do this to achieve:
A. Location Transparency
B. Failure Transparency
C. Access Transparency
D. Migration Transparency - ✔✔C
We hide where an object is located in order to achieve:
A. Location Transparency
