internet ok ok (1)
Post on 20-Jan-2015
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- 1. Internet Paula Serrano Anna Sanchez Maria Snchez
2. Contents* Comunication systems * Computer networks * Functions of a network * Elements of a network * Internet networks * What is internet? * Internet domains * Internet services * Blogs and wiki pages * Electronic mail or email * Virtual communities and social networks * Other internet services * More sevices * Finding information * Differences between web mail and POP mail. 3. Comunication systems *Interlocutors: are the people who use the networked computers. They are called network users. *Messages: are the files on the network that we can access: Written documents, videos, music, drawings, programs *Means: The instruments used by the interlocutors to send and receive massages. *Code: The system of signs - a language, smoke signals or tom-tom drums that the interlocutors share and use to create their messages. 4. Computer networks A network is two or more computers connected to one another that can share documents, files, printers, etc. 5. Functions of a network If some computers are connected into a network: * You can send and receive information from one computer to another and from one house to another. * You can also send to your teacher a piece of work done on the computer. 6. Elements of a network A network basically consists of the following elements: 1.- The server and the terminals 2.- A network interface card for each network computer. This transmits and receives the information to and from the rest of the computers. 3.- A transmission means: the cables that are connect the computers. If the network is wireless, cables are unnecessary. 4.- An element that controls and distributes informationa among the computers. This elements can be hub (concentrador) or a switch (conmutador) 5.- The necessary programs to transmit the infirmation from one computer to another. 7. Interconnected networks An interconnected network or a network of networks is two or more networks connected together to form a system. For connect several networks, we have to use the same codes (protocols) on each network. 8. What is internet? The internet is a huge network of networks, interconnected worldwide. For go to the Internet you need to use a server. (Google Chrome, Internet Explorer). Each server is identified by a domain name. 9. Internet domains Web addresses normally end in a dot followed by two or three letters; for example: *www.iescanet.cat *www.redcross.org *www.educacion.es *www.losacrodes.com The letters after www. in web addresses represent the domain name. A domain name is the server name plus the generic top-level domain (.org, .es, .com) separeted by a dot (.). This indicate the location organisation or field that this website belongs to. 10. Internet services * Web pages (hypertext) These are enriched text documents with many format options. They are divided into frames and can included images and other multimedia elements (sound or video files). The difference between web pages and conventional documents is that web pages include links to different parts of the document or web sites. We need a browser for send and recive documents. 11. Blogs and wiki pages *Blogs: This are pages that are periodically updated. They contain articles from one or several authors. The most recent entry appears first on the page. Readers can write comments about the article. Each blog has rules of use an a topic. *Wiki pages:These pages can be created and modified by different users from their browser. Anyone can participate in creating and editing the information. The most well-known wiki is Wikipedia. 12. Electronic mail or email This service enables us to send and recieve messages that can contain either text alone or text with multimedia elements (sound, video, photo). There are two options for using this: * Go onto a web page that offers this servise (Gmail, Yahoo Mail, Hotmail). * Use a program that manages email, such as Outlook Express (windows), Mozilla Thunderbird, Evolution (Linux), Mail (for Macintosh computers)... 13. Virtual communities and social networks A virtual community is a group of people who communicate and have a relationship in a virtual space, like the Internet, instead of a physical space.Social networks have envolved from virtual communities. They are online communities where people from all over the world are in contact for a particular reason . 14. Other Internet services *Debate and news forums. Network users can exchange information and opinions through these services. *Chats and videoconferences. A text conversation between two or more users is called a chat. A videoconference is a conversation usiing voice as well as live video transmission.*IP telephony, is another technology, that enables two or more people talkover the network. Is like a telephone conversation but its done over the interent. 15. More services... *Instant messaging. This service enables us to communicate in real time with another user connected to the Internet anywhere in the world. (Like a chat but between to people). *P2P networks. These are tools for massive interchange of video, music, text files. Its a programm where one gives the file and an other takes it. *File transfer. This is used to send large files from one computer to another quickly and efficiently. 16. Finding information A search engine is a web page resource that has a database of contents of web pages throughout the Internet, worldwide.We can find information in: * Dictionaries * Wikipedia * Portals * ect 17. Differences between web mail and POP mail *Web mail: For consult your own mail you need to connect to the Internet from any computer. The files of the mail always stay in the Internet. You have the option of download it but it stay in the web mail. *POP mail: For consult your own mail you need to enter with a specific computer. The files of the mail download automatically and they are saved in the computer memory. 18. The end We hope that you enjoy it.