1.     Application program interface services allow a program to access network services. Some network operating systems also provide access to services on remote machines that might not be available locally. These services are called

a.      server-client calls (SCCs).

b.     object procedure calls (OPCs).

c.      remote procedure calls (RPCs).

d.     network method calls (NMCs).

 

1.     A ____________ occurs when two different records calculate to the same hash number (logical record number).

a.      crash

b.     impact

c.      conflict

d.     collision

 

 

 

2.     The Universal Data Format (UDF) supports High Definition and Blu-Ray DVD formats. UDF directory format is ______________. 

a.      flat

b.     ad hoc

c.      matrix

d.     hierarchical

3.     The file system must maintain a directory structure for each device. In most cases, the directory for each device is stored on the device itself. In many computer systems, each file system is called a

a.      disk.

b.     volume.

c.      directory.

d.     partition.

 

1.     Which of the following is NOT an important feature of a command language?

a.      Branch and loop

b.     Print messages on the screen

c.      Notifying the system administrator

d.     Assign and change the value of a variable

 

 

1.     Perform the Round-Robin dispatch algorithm, with time quantum equal to 300 milliseconds, on the job queue and calculate:

Job 1 arrives at time 0 and needs 500 milliseconds to complete.

Job 2 arrives at time 300 milliseconds and needs 400 milliseconds to complete.

Job 3 arrives at time 400 milliseconds and needs 200 milliseconds to complete.

Job 4 arrives at time 400 milliseconds and needs 500 milliseconds to complete.

 

a.      The average wait time. (Hint: average the number milliseconds each job was in a wait state)

b.     Average turn-around-time. (Hint: for each job, count the number of milliseconds from arrival to completion and average)

 

 

 

 

 

 

 

1.     Answer both part a and b.

a.      What is the responsibility of the dispatcher during a context-switch?

b.     There are two levels of scheduling. One level of scheduling determines which jobs will be admitted to the system and in what order. What does the other level of scheduling do?

 

 

 

2.     What system architecture is typically used to support high availability and scalability and how (Hint: Group Project. Please explain how the architecture supports high availability and scalability)?

 

 

1.     How is a hardware failure such as memory fault different than an interrupt from the hard disk controller signaling that a data transfer has completed? (Three or four sentences are sufficient)

 

1.     Suppose that the keyboard device stored keystrokes in a buffer until a valid command is recognized. Describe what software component is needed and how it notifies the operating system to process the command. (Two or three sentences should be adequate to answer this question)

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• 1513000045-ITEC625_FianlExam 2017 Spring 1.docx