sistemas operativos

1. Operative SystemsOperative Systems
A) WHAT IS AN OPERATIVE SYSTEM?
An operative system is the conjunct of informatic programs that allow the
good administration of computer means.
This programs begin to work when you turn on the computer.

2. B) Indicate the functions and main features of an operating system
FUNCTIONS
● Administration of the processor: The operative system
administrates the distribution of the processor on the differents
programs by a scheduling algorithm.
● Management Random Access Memory: The operative system is
encharged of managing the memory space asigned to each
application.
When this memory is insufficient, the operative system can create a
place of memory in the hard disk drive, this "virtual memory" can
manage applications that need a bigger memory than the RAM, but is
slower.
● Management of inputs and outputs: The operative system alows to
unify and control the access of the programs to the material sources
through the drivers.
● Management of ejecution of applications: The operative system
ensures that applications run smoothly assigning them the resources
they need to function.

3. MAIN FEATURES
● Convenience: An operative system makes more convevient the use
of a computer.
● Eficiency: The operative system allows that the resources of the
computer are used correctly.
● Ability to evolve: An operative system must be able to accept new
functions withouth problems.
● Encharged to administrate the hardware: The operative system
has to be efficient.
Connect hardwares: When the operative system detects another
operative system connected in itself.
● Algorithms: An operative system makes the most racional use of
the computer.

4. C) What are the major operating systems today?
● Windows.
● MacOS.
● Linux.
● Android.
● Solaris.

5. D) How do we classify operating systems?
USER
● Monouser: Only one user works with the computer and has all the means for he/she.
● Multiuser: Many users can use the computer at the same time.
● PROCESS
● Monowork: Only can ejecute one work at the same time, the other means are
disponible for the same work.
● Multiwork: In this systems, you can ejecute many programs at the same time.
● PROCESSORS:
● Monoprocessor
● Multiprocessor: The use have two ways:
● -SMP, Symetrical MultiProcessing:The operative system use the processors equaly.
● -AMP, Asymetrical MultiProcessing:The operative system give one work for each
processor.
● TIME:
● Real time
● Timeshare

6. E) Indicate what Drivers are and their use in an OS

7. F) Indicate, step by step, how to install and uninstall an application on
Windows:
In the web page you click the link.
You do this:
● To install the program you click on ejecute, and you follow the
instructions.
● If you want to install it later, you have to save it and download the archive
of instalation in the pc.
To uninstall it you go to control panel and click right button on the
program.

8. G) How to improve performance and speed in a OS?
● Uninstall all you dont need
● Delete the temporals of your computer
● Delete the internet temporals
● Install Ccleaner or similarities
● A good antivirus
● Desfragment the hard disk
● Change the operative system
● Increase RAM memory

9. H) What are dual systems: Grub, lilo, loader?
GRUB: is a multi boot manager, commonly used to start one, two or
more operating systems installed on a single computer.
LILO: is a boot manager that allows you to choose between Linux
and other operating systems platforms, which has to work when you
start a computer with more than one operating system available.
LOADER: It is responsible boot file Operating System in early
versions of Microsoft Windows NT

10. ● I) What is a virtual machine?
● In informatics, a virtual machine is a software that simulate a
computer and can ejecute programs like a real pc.

11. J) What are the operating systems on Live-CD or Live-USB ?
● Live CD--> It´s an operative system save in a removable media, like
a CD or a DVD.
● Live USB--> Its the same but with a USB

12. K) What is a "Bios"?
-A Bios (Binary Input Output System), is the basic operative system of
input and output, and it´s encharged of the manage of the mother
board and it´s components.

13. L) What is the boot sequence in an operating system?
When a informatic system turns on, iniciates the boot sequence.
This boot sequence is variable in function of the plataform ( hardware
and software) in which have place.
A possible division can be:
Steps:
-You push the ON button
-The hardware start to work. It first work is ejecute the POST (power on
self test).
- It charges and ejecute the boot manager
-It charges and ejecute the operative system