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How does the internet works?

What's an IP address?  Internet Protocol Address is a unique number of any devices on the Internet.

How many characters does an IP address have?  18 characters

What's the meaning of URL and which is another form to name it? Uniform Resource Locator and other name might be "web address"

In the Internet, the information travels directly from the nearest server to your computer. True or false? Why?  True, it search the IP who has the information you needs.

What's a Web Cache Server?  It’s a holding tank for the most popular writers.

Write all the devices mentioned in the video as a computer.  PC, Tablet, smartphone.

What's an ISP?  Internet Service Provider, they are people who provide other people their connection to the Internet.

What's the DNS?  Domain Name Server is to know which IP Addresses are connected to which URL's.

What is the analogy that the presenter uses to explain how Internet works?  Is like a telephone, where the cables connecting people in devices to the internet around the world.

What is Hypertext Transfer Protocol?  It transfer information into small packages and take different routes to be reassemble in your computer.

What does TCP mean?  Transfer Control Protocol.

In your own words, explain how Internet works. 

I think is like the cab where "The Architect" of the Matrix was, that was a big room, round, and there are many squares (like little screens) where the information goes from a big column in the middle of the room to your device. And the info flows through the room from a screen to another, growing and multiplying itself.

Computer Virus

References

http://www.microsoft.com/es-es/security/pc-security/virus-whatis.aspx http://www.tiposde.org/informatica/19-tipos-de-virus-informaticos/

Operating Systems

What an Operating System (OS) is?
An operating system or OS is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer and software programs would be useless.

Which are its characteristics?
1. Job or process management.
2. Magagement of I/O devices and resourcess.
3. Scheduling job batch.
4. Memory handling/allocation/managemet.
5. File handling/managemen.
6. Error reporting.

How can operating systems be classified?
GUI - Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse.

Multi-user - A multi-user operating system allows for multiple users to use the same computer at the same time and different times.

Multiprocessing - An operating system capable of supporting and utilizing more than one computer processor.

Multitasking - An operating system that is capable of allowing multiple software processes to run at the same time.

Multithreading - Operating systems that allow different parts of a software program to run concurrently.

What is mobile operating system?
A mobile operating system (mobile OS) is an OS built exclusively for a mobile device, such as a smartphone, personal digital assistant (PDA), tablet or other embedded mobile OS. Popular mobile operating systems are Android, Symbian, iOS, BlackBerry OS and Windows Mobile. What is network operating system?
A network operating system is an operating system designed for the sole purpose of supporting workstations, database sharing, application sharing and file and printer access sharing among multiple computers in a network.

What is a Multi-user Operating System?
When referring to a computer operating system, a multi-user system is a computer with an operating system that supports multiple users at once or different times.
The common examples of multi-user operating system include VMS, Unix, and mainframe operating systems which include MVS system.

What is a multiprocessing Operating System?
Multiprocessing system is based on the symmetric multiprocessing model, in which each processor runs an identical copy of operating system and these copies communicate with each other. In this system processor is assigned a specific task. A master processor controls the system. This scheme defines a master-slave relationship. These systems can save money in compare to single processor systems because the processors can share peripherals, power supplies and other devices.

Examples:
Linux
Unix
Windows 2000

What is a multitasking Operating System?
A multitasking operating system is any type of system that is capable of running more than one program at a time. Most modern operating systems are configured to handle multiple programs simultaneously, with the exception of some privately developed systems that are designed for use in specific business settings.

Examples:
Linux
Unix
Windows 2000

Which are the top 5 Operating Systems?
1. Windows 7
2. Windows 8
3. Unbuntu
4. Windows XP Professional
5. Macintosh OSX

Wich are the top 5 Mobile Operating Systems?
1. Google Android OS
2. Apple iOS
3. BlackBerry
4. Symbian OS
5. Firefox OS


References

Entered on February 24th,2014 at 12:15 p.m.
[visited online on= http://www.computerhope.com/os.htm]
Entered on February 24, 2014 at 12:22 p.m.
[visited online on= http://wiki.answers.com/Q/What_are_the_characteristics_of_disk_operating_system#slide=1]
Entered on February 24, 2014 at 12:25 p.m.
[visited online on=http://www.techopedia.com/definition/3391/mobile-operating-system-mobile-os]
Entered on February 24, 2014at 12:26 p.m.
[visited online on= http://www.techopedia.com/definition/3399/network-operating-system-nos]
Entered on February 24, 2014 at 12:33 p.m.
[visited on= http://arnelirobles.hubpages.com/hub/Top-10-Mobile-Operating-System]

Input and Output Devices

Input/output device: also known as computer peripheral,any of various devices (including sensors) used to enter information and instructions into a computer for storage or processing and to deliver the processed data to a human operator or, in some cases, a machine controlled by the computer;a hardware device that has the ability to accept inputted, outputted or other processed data. It also can acquire respective media data as input sent to a computer or send computer data to storage media as storage output. The terms “input” and “output” are used both as verbs to describe the process of entering or displaying the data.

Input Devices
1. Keyboard
2. Pointing Devices
3. Mouse
4. Touch Pad
5. Trackpoint
6. Trackball
7. Joysticks
8. Touch screen
9. Graphics tablet
10. Scanners

Output Devices
1. CRT Monitor
2. Flat Panel Monitor
3. Ink Jet Printer
4. Laser Printer
5. Other Printer
6. Sound Output
7. 3D Printer
8. GPS
9. Headphones
10. Sound card

References
http://global.britannica.com/EBchecked/topic/288883/inputoutput-device http://www.unm.edu/~tbeach/terms/inputoutput.html
http://www.techopedia.com/definition/7650/input-output-device-io-device
http://www.computerhope.com/jargon/o/outputde.htm