In this unit you will find out the answers to this questions: What isa computer network?, How would you describe the Internet?, What are the elements ofr an Internet address? How you can search for information on the Internet? What are the advantages and disagvantages of communication between computers?.
Theory and questions in this link: NETWORK
Activities
1.- What is a computer network? Which is the simplest network?
When two or more computers are connected to each other and exchange information are network o comprise network. The simplest network is that of computers connected directly through a network cable.
2.- How can small computer network be created?
A small network can be easily created by connecting various computers to a device called switch. There are switches for 4, 8, 12, 16, 20, 24 or more computers. If necessary, various switches can be connected together in order to create networks with dozens or even hundreds of computers
3.- What does the star network configuration consist of? What advanged does it offer?
Various switches that can be connected together in order to create networks with dozens or even hundreds of computers, since all the cables come together at a central point, the switch. Advanced knowledge.
4.- What is the prupose of switch?
The prupose of the switch is to direct the trafic of the data among the diferent computers and ensure that it flows smoothly.
5.- What is the most commonly used technology in small networks?
6.- What is the purpose of a network card? Where is it installed?
Is a device to conect through a wire the computer to a switch and to set up a group of computers. To conect to a network. This card is pheriperal that acts as intermediary between the network and the computer. It is placed into one of the expansion slots of the motherboard.
7.- A nework card does not have to be installed in desktop computers or the more modern laptops. Why?
Because some computers have a set of programs for connecting to a network. They are drivers and network protocols.
8.- What is a network card controller?
This are programs that give the network cards the instruction they need to operate. Without these programs, the card would be nothing more than an useless chips and cables. They are normaly supplied by the manufacturer.
9.- What is a network protocol? Which is the most commonly used?
This is the set of rules specify the metod for sending and reciving data among various computers. The mos commonly used is the TCP/IP.
4.1. COMMUNICATION SYSTEM
When you communicate with anther person you use a communication system where are the following elements: interlocutors, the messages, the means and the code.
In ICT (Information and Communication Technology) you use a computer as a means, the users as the interlocutors, the files are the messages and the protocols as the type of codes that the computers use to understand each other.
A network is two or more computers connect to one another tha can share documents, files, printers, etc. Some networks have a powerful computer called a server which manages the network and stores most of the information. As well as there are terminals, which are less powerful computers that work with information received from the server.
A server basically consists of the following elements: the server, the terminals, a network card for each computer to transmit and to receive the data, a transmission means, a switch tha controlls and distributes the data the computers and the neccesary programs to transmit this information from one computer to another.
ACTIVITY 1.
a) Copy and complete the table in your blog about these means of communication:
Messages
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Means
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Code
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Telegraph
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Tape
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Electric cable
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Morse
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Fax
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Paper
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Telephone line
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Sounds
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Smoke signal
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Smoke
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Smoke
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Numerical code
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Post office
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Letter
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Mailman
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Telephone
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Audio
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Electric cable
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Television
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Audio and image
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Radiowaves
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b) Do you know Morse code? The most famous message is SOS ***---***. Transmit a message to your partner in morse touching his back quickly for the dots and longer for the dashes. Look at the code on the internet and copy it into your blog. Write down your name with this code.
4.2. INTERNET. THE NETWORK OF NETWORKS.
The Internet is a huge network of networks, interconected worldwide.
When we go into the Internet we connect our computer to a server. There are millions of servers all over the world each of them identified bya a domain name (eg. www.terra.es). The generic top-level domains consist of two or three letters is used to indicate the locations, organisation or field tha this website belons to (e.g. es,org, com, net, edu, ...)
INTERNET SERVICES:
A) WEB PAGES: these are enriched text documents with many format options. The are divided into frames and can include images and other multimedia elements, eg. sound or video files. Web pages include links to different parts. These web pages have the extension HTML and it is necesary a browser to be readed.
B) BLOGS AND WIKI PAGES: Blogs and wiki pages are special types of web pages. Blogs contain articles from one or several authors. The most recent entry appears first on the page. Wiki pages can be created and modifield by different users from their browser. Any can participate in creating and editing the information (eg. Wikipedia).
C) E_MAIL (ELECTRONIC MAIL): enables us to send and receive messages that contain either text alone to text multimedia elements.There are two types of email: POP or WEB Email.
D) SOCIAL NETWORK. A virtual communicaty is a group of people who communicate and have relationship in a virtual space: tuenti, facebook, myspace, orkut, etc.
E) OTHERS: Chats, Forums, P2P networks, FTP, IP Telephony, Instant messaging.
ACTIVITIES Nº1.
1.- Find out about these programs: PIDGIN, OPERA, EUDORA, ARES, COFFECUP, AMAYA, PEGASUS MAIL, BITTORRENT.What Internet service are the desingned for?
2.- Using Google Docs or Hotmail Docs, work with a classmate and create a glossary of terms related to computers security that includes entries such as: virus, antivirus, firewall, compunter worm, trojan, malware, hoax, etc. ..share this file with its link and put it into your WebBlog.
TASK 1.
1.- Go to the home page of Nominalia www.nominalia.com and find a form wher you can check if a domain name is registered or not. Try with different names and compares your findings with the rest of the class.
2.- Create a simple web page using HTML programing: LINK: Códido HTML
3.- Create a web page using for example www.everyoneweb.es (or http://sites.google.com) that offers the opportunity of creating a web page direcly on the web site, working from the browser and without installing any programs on your computer.
TASK 2.
1.- Create a wiki.
ANEXES:
http://www.webs.com/
http://galeon.hispavista.com/
http://www.everyoneweb.es/
http://www.uv.es/jac/guia/ (Guía Código HTML)
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