How does the internet work

1.What is the internet ?

The internet is a global network of computers each computer connected to the Internet must have a unique address.

2.What is Internet Protocal ? (IP address )

Internet Protocal (IP) is the language that computers use to communicate over the internet .A protocal is the pre-defined way that someone who wants to use a service talks with that service.

3.What is the OSI model ?

The OSI Model is used to describe networks and network application.

Layers of OSI  Model 

There are Sever Layers of OSI Model :

OSI Layer Diagram:

            

7)  Application Layer : The application layer provider different services to the application. Example of services provided by this layer are file transfer, electronic messaging e-mail, virtual terminal access and network management.

6) Presentation Layer : The Presentation layer is responsible for protocol conversion, date encryption/decryption, Expanding graphics command and the date compression. This layer makes the communications between two host possible.

5) Session Layer : This layer is responsible for establishing the process-to-process communication between the host in the network. This layer is responsible for establishing and ending the sessions across the network. The interactive login is an example of services provided by this layer in which the connective are re-connected in care of any interruption.

4) Transport Layer : This layer is responsible for end-to-end delivers of messages between the networked hosts. It first divides the streams of data into chunks or packets before transmission and  then the receiving computer re-assembles the packets. It also guarantee error free data delivery without loss or duplications.

3) Network Layer : This layer is responsible for translating the logical network address and names into their physical address ( MAC address). This layer is also responsible for addressing, determining routes for sending and managing network problems such as packet switching, data congestion and routines.

2) Data Link Layer : Data link layer is responsible for controlling the error between adjacent nodes and transfer the frames to other computer via physical layer. Data link layer is used by hubs and switches for their operation.

1) Physical Layer : Physical  Layer is responsible for transmitting row bit stream over the physical cable. The physical layer defines the hardware items such as cables, cards, voltages etc.

4.What is Internet Infrastructure ?

First of all, let me define what I mean by ‘Internet Infrastructure’. All the hardware and services required to make this web page appear in your browser, or an RSS feed download into your reader, or VOIP calls / emails get to your desktop. All the underlying technologies that are unseen, but ‘make the Internet go’.

I see Internet Infrastructure consisting of a ‘Top 5′ areas :

• Data Centres
• Network Connectivity
• Computer Equipment
• Storage Services
• Server Applications

5.What is domain names ?

The domain names or DNS is a distributed database which keeps track of computer 's names and their corresponding IP address on the internet.

6.What is world wide web ? and its services ?

The World Wide Web, abbreviated as WWW and commonly known as the Web, is a system of interlinked hypertext documents accessed via the Internet. With a web browser, one can view web pages that may contain text, images, videos, and other multimedia and navigate between them by using hyperlinks. Using concepts from earlier hypertext systems.

7.How many internet users in Thailand ?

Thailand
Internet usage, broadband and telecommunications reports

Internet Usage Statistics:
17,486,400 Internet users as of June, 2010
per ITU.