Operating Systems Services Quiz
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Questions and Answers

What is paravirtualization?

  • A technique where the Virtual Machine Manager mimics the real hardware for virtual machines
  • Enabling applications to run on different hardware environments by modifying the Virtual Machine Manager
  • Virtualization without using real hardware but creating an optimized virtual system
  • A technique where the guest operating system is modified to work with the Virtual Machine Manager (correct)

    • What characterizes hardware-based solutions for virtual machine creation and management?

  • They work independently of any operating systems
  • They create optimized virtual systems without relying on real hardware virtualization
  • They provide support for virtual machines via firmware (correct)
  • They run as applications on standard operating systems

    • How do applications that provide VMM features to guest OS differ from paravirtualization?

  • They mimic the real hardware for virtual machines
  • They enable applications to run on different hardware environments without modifying the VMM (correct)
  • They directly interact with real hardware
  • They modify the guest OS to optimize performance

    • In a brute-force attack context, what does it involve?

    <p>Using excessive computational power to try all possible key combinations</p> Signup and view all the answers

    How does paravirtualization differ from creating an optimized virtual system without real hardware virtualization?

    <p>It involves modifying the guest OS to work with the VMM</p> Signup and view all the answers

    What does the term 'Masquerading (breach authentication)' refer to?

    <p>Intruder sits in data flow, masquerading as sender to receiver and vice versa</p> Signup and view all the answers

    What is the main characteristic of malware?

    <p>Software designed to exploit, disable, or damage computer</p> Signup and view all the answers

    What do 'Rings of protection' aim to do?

    <p>Separate functions into domains and order them</p> Signup and view all the answers

    What is an Access matrix used for?

    <p>Is a table that defines access permissions between specific subjects and objects</p> Signup and view all the answers

    What is the purpose of the Memory Management Unit (MMU)?

    <p>Hardware device that at run time maps virtual to physical address</p> Signup and view all the answers

    In Virtual Memory, what does the separation refer to?

    <p>User logical memory from physical memory</p> Signup and view all the answers

    What is Copy-on-Write (COW) primarily used for?

    <p>Allowing multiple processes to share the same data until a modification is attempted</p> Signup and view all the answers

    Who generates the logical address in a computer system?

    <p>CPU</p> Signup and view all the answers

    When does the Memory Management Unit (MMU) perform address mapping?

    <p>At run time</p> Signup and view all the answers

    What is required for a student to participate in the online in class test?

    <p>Valid identification card</p> Signup and view all the answers

    Which of the following are states that a process can be in?

    <p>Running</p> Signup and view all the answers

    What is a common service offered by Operating Systems?

    <p>Error Detection</p> Signup and view all the answers

    Which characteristic is common to all Operating Systems?

    <p>Program execution</p> Signup and view all the answers

    What do all devices from smartwatches to cluster HPCs share in common?

    <p>Program execution</p> Signup and view all the answers

    Which service is not typically offered by Operating Systems?

    <p>Anti-virus</p> Signup and view all the answers

    What is the output of the following code: String var_a="c"; String var_b="c"; if (var_a.equals(var_b)){ System.out.println("A and B have the same value!"); } else{ System.out.println("A and B do not have the same value!"); }

    <p>A and B have the same value!</p> Signup and view all the answers

    Which of the following are valid Java identifiers?

    <p>grade</p> Signup and view all the answers

    What is the output of the following code: for(int i=10;i>-1;--i) { System.out.print((i+1)+" "); }

    <p>1 2 3 4 5 6 7 8 9 10 11</p> Signup and view all the answers

    What is the output of the following code: for(int i=0;I

    <p>Compilation Error</p> Signup and view all the answers

    Which of the following could be a valid Java identifier based on the naming conventions?

    <p>MIN-CAPACITY</p> Signup and view all the answers

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