Daniela Torre TIC

4. Computer security Active and passive security The internet is a network that connects computers and people around the world. It is a form of communication  with many advantages, but it also has it risks: it is a world of information in which we have to move carefully. A  computer is not a harmless tool. https://www.youtube.com/watch?v=yeepZr64XjU https://www.youtube.com/watch?v=wNuRKyMJRQk If we want to travel safely by car, it’s not enough to know how to drive: we must also know what safety devices  the vehicle has (seatbelt, airbags, ABS, etc), and the traffic rules that govern interaction with other vehicles.  Similarly, if we are going to use a computer on a network, we must: Know how to use it (we should be careful when using tools that we are unfamiliar with, especially online). Know what security tools are available to us (so we’ll know if we are protected against viruses, spam and  websites with unwanted content). Apply a set ...

Networks Notes PAN= Panoral Area Net  LAN= Local Area Net MAN= Metropolitan Area Net WAN= World Area Net Computer networks A computer network is a set of computers connected to each other so they can share resources and exchange  information. We can divide computer networks into three categories, depending on their size: Local area networks or LANs Metropolitan area networks , made up of several LANs Wide area networks , covering a country or continent. LANs can also be categorised according to the way in which the different machines are are connected to each  other. Elements in a network All computer networks have a logical component, which is an operating system and applications that work on a  network, and a physical component connecting the different computers to each other. Each computer needs an adaptor or networkcard to send information to the other computers and receive  information back. The hub distribut...

                            TECHNICAL VOCABULARY Forecast: previsión Motherboard: placa base/placa madre   Networks: PAN= Panoral Area Net  LAN= Local Area Net MAN= Metropolitan Area Net WAN= World Area Net

21/9/018 A computer consists basically ofhardware and software. We can define hardware as the physical part of the computer: both the box and the internal components  (motherboard, hard disk, etc.). The software consists of programs, instructions, computer applications and the operating system. https://www.youtube.com/watch?v=SbqXqQ-2ixs (9 min) Motherboard The motherboard is the largest card with a printed circuit you see when you open a computer.   All the other components are inserted on it, as you will see. It includes connectors or communication ports  with peripherals and can also incorporate video, audio and network devices, among others, depending on the  characteristics of the computer. Microprocessor The microprocessor is the most important part of the computer. It is responsible for processing data,  performing arithmetical-logical operations and controlling all the other devices. It is characterized by its  worki...