Open Source Software

• Название: Open Source Software
• Дата: 26.05.2022
• Размер: 1.28 Mb.
• Имя файла: Final_OS 2.docx
• Тип: Документы; #551026
• страница: 37 из 39

Memory

1.Question 1

A rather complete picture of memory usage can be gotten by viewing the following pseudofile:

• 
  /proc/meminfo
  

2.Question 2

Select all true statements:

• 
  Memory used directly by the Linux kernel is never swapped out.
  
• 
  Using swap space lets the system pretend it has more memory than it physically has.
  
• 
  There is no uniform prescription for how much swap space to use.
  

3.Question 3

Which statement(s) are correct?

• 
  The pthreads library enables multithreaded applications to be written just once for many different operating systems.
  
• 
  A process may contain many threads.
  

4.Question 4

The OOM KIller

Tries to keep the system running by killing processes which are using more memory than can be supplied

5.Question 5

Which of the following are utilities used to work with swap space?

• 
  swapon
  
• 
  swapoff
  
• 
  mkswap
  

Networking

1.Question 1

Which networking configuration interface is newer and has extended capabilities?

ip

2.Question 2

Using Predictable Network Interface Device Names (PNIDN) has come into use because:

• 
  Many computers are no longer in one location; for example, laptops are on the move, and available interfaces are subject to change
  
• 
  Hardware such as USB devices can be added and removed at runtime
  
• 
  On modern systems, the order in which network hardware is found is less predictable
  

3.Question 3

Which command(s) will bring the network interface eth0 up and assign an address to it?

• 
  sudo ip addr add 192.168.1.100 dev eth0
  
• 
  sudo ifconfig eth0 up 192.168.1.100
  

4.Question 4

You can see statistics for the eth0 interface by (select all answers that apply):

• 
  looking at /sys/class/net/eth0/statistics
  
• 
  doing sudo ip -s link show eth0
  
• 
  doing sudo ifconfig eth0
  

5.Question 5

What does MTU stand for?

• 
  Maximum Transfer Unit (usually 1500 bytes by default) for Ethernet packets
  

System Initialization

1.Question 1

What is the proper order of system initialization stages on most x86-based systems?

• 
  BIOS -> GRUB -> init (PID 1)
  

2.Question 2

Which files need to be in the /boot directory for the system to boot up (select all that apply)?

• 
  initramfs
  
• 
  vmlinuz
  

3.Question 3

Using GRUB lets you (Select all correct answers):

(All are correct)

• 
  Choose various options for booting up the system
  
• 
  Choose which Linux kernel to user for boot
  
• 
  Choose between operating systems or different Linux distributions
  

4.Question 4

Select the order in which the following system initialization methods were introduced:

• 
  SysVinit -> Upstart -> systemd
  

5.Question 5

Which runlevel is multiple user with no graphical desktop?

• 
  3
  

Kernel Modules and Device Management

1.Question 1

Which statements are true?

• 
  It is impossible to unload a kernel module being used by an application.
  
• 
  It is impossible to unload a kernel module being used by another module
  

2.Question 2

The lsmod utility shows for each loaded module (select all correct answers):

• 
  How many processes depend on it
  
• 
  Its size in bytes
  
• 
  What other modules are using it
  

3.Question 3

Udev (select all correct answers):

• 
  Loads and unloads device drivers and other kernel modules as needed
  
• 
  Stands for User Device
  
• 
  Is responsible for populating the /dev directory once the system is up and running.
  

4.Question 4

Which command will ensure the httpd service (Apache) starts at system boot?

sudo systemctl enable httpd.service

5.Question 5

How could you ensure the httpd service (Apache) is restarted if it is already running, say to absorb a revised configuration file (select all correct answers)?

• 
  sudo systemctl stop httpd && sudo systemctl start httpd
  
• 
  sudo systemctl restart httpd