Quiz: Linux Basics

User Space, Kernel Space

• Kernel/user space: which of the following statements are true?

  Statement	True	False
  In kernel space there exists the concept of a process
  In user space there exists the concept of a process
  Interrupts are generally serviced in user space
  Interrupts are generally serviced in kernel space
  Scheduling of processes is done by the kernel
  Address spaces are implemented in user space

• How do programs communicate with the kernel? (One answer)

  Statement	True	False
  System calls
  Message queues
  IO ports
  Reverse interrupts

• File abstraction: which concepts are represented by file decriptors?

  Statement	True	False
  Files
  Network sockets
  Timers
  Serial/UART devices
  Memory
  The process stack

• The term “blocking” describes which behavior? (One answer)

  Statement	True	False
  A process can block another for communication purposes
  A process consumes no CPU time while it waits for an event to happen
  The kernel blocks access to network resources to enhance system security

Processes, Scheduling, and Virtual Memory

• Scheduling: which of the following statements are true?

  Statement	True	False
  A timeslice is the amount of time that a process can run until it is suspended in favor of other processes
  Fair scheduling ensures that network resources are evenly shared
  On a single-CPU machine, no process may enter an infinite loop - or else, the entire machine will come to a halt
  Fair scheduling ensures that every process gets its fair share of CPU resources
  The scheduler gives processes the illusion that each of them owns the CPU
  A context switch happens when one process enters a blocking system call

• Virtual Memory: which of the following statements are true?

  Statement	True	False
  A process can own all memory in the system
  The kernel is the owner of all memory in the system
  All processes share a single address space
  Each process in the system has its own address space
  An address space is three-dimensional

• Processes: which of the following statements are true?

  Statement	True	False
  A process is identified by its process ID
  A process is identified by its pthread context number
  Processes are arranged in a process hierarchy, starting at process 1
  A process may have multiple parents
  Every process has a parent process
  Every process except process 1 has a parent process

(Solutions)

Dependencies