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Operating System
1081
Computer Science Fundamentals
998
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OS I/O Systems
In polling ____________
busy – wait cycles wait for I/O from device
interrupt handler receives interrupts
interrupt-request line is triggered by I/O device
all of the mentioned
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OS The Linux System
________ replacement generally results in greater system throughput.
Local
Global
Universal
Public
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OS Security
Which two of the following are authentication algorithms?
MAC
AES
DAS
Digital-signature
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OS Distributed File Systems
What are design issues in distributed system structure?
Scalability
Fault-tolerance
Clustering
All of the mentioned
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OS CPU Scheduling
Which of the following scheduling algorithms gives minimum average waiting time?
FCFS
SJF
Round – robin
Priority
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Computer Science Fundamentals
Convert (6532)8 to hexadecimal.
(A01)16
(A02)16
(D5A)16
(C01)16
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OS Protection
What is a major feature of segmentation?
Program is divided in data memory and program memory
Program is executed in segments
Program is divided into pieces having different access rights
It has effect of an unbounded architecture
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OS I/O Systems
A non blocking system call _________________
halts the execution of the application for an extended time
does not halt the execution of the application
does not block the interrupts
none of the mentioned
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rikazzz
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OS Distributed Communication
In a programmed input/output(PIO) __________
the CPU uses polling to watch the control bit constantly, looping to see if a device is ready
the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available
the CPU receives an interrupt when the device is ready for the next byte
the CPU runs a user written code and does accordingly
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rikazzz
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Computer Science Fundamentals
When the data at a location in cache is different from the data located in the main memory, the cache is called _____________
Unique
Inconsistent
Variable
Fault
The cache is said to be inconsistent. Inconsistency must be avoided as it leads to serious data bugs.
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rikazzz
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