The different between Internets and Extranet is as follows:

internets and extranet



  1. Internet contains the information of one organization.
  1. Extranet may have the information two or more organizations.
  1. Internet is used to provide information to the employees.
  1. Extranet is used to share information with other organizations.

What is Email? Explain its advantages.

Email stands for Electronic Mail is the exchange of messages and files through Internet. Message can be in the form of graphics, sounds, video clips, or simple text. It is a fast way of sending message anywhere in the world in the very short time.

The sender and receiver may be sitting in the same building or anywhere in the world one email message can be sent to many people. Email facility is provided by many internet services providers or specialized website. Yahoo, Hotmail, and Gmail are some popular examples of emails providing websites.



Advantages and Uses of Email

Some advantages of email are as follows:

1. It is very fast and timely.

2. It is very cheap and inexpensive.

3. People can send and receive message anywhere in the world.

4. People can share the information.

5. It is possible to send and receive email through mobile phone.

6. Email gives us the facility to send pictures, sounds and videos.

7. Email message does not disturb the recipient. It is stored on a server and can be read at any time.

What a short note on HTTP.

HTTP stands for Hyper Text Transport Protocol. It is a communication protocol used to connect to servers on the World Wide Web. The primary function of HTTP is to establish a connection with a Web server and transmit html pages to the user’s browser. It allows computer users to access the internet.

What is an OSL Model? Write the names of layers in this model. Draw and label OSL Model.

OSL stands for Open System Interconnection. An open system is a model that allows any two systems to communicate even if their architectures are different.OSL developed by International Standards Organization (LOS) in 1983. It provides a logical framework for data communication process industry to allow different networks to together efficiently.

OSI model consists of seven layers. Each layer performs a specific function in network communication. The layers are divided into two groups:

  1. Upper Layer: The upper layer focus on user applications and how files are represented on computer before transfer.
  2.  Lower Layer: The lower layers are concerned with how the communication across a network actually occurs.

Different layers of OSI Model

OSI model consists of seven layers that are as follows:

7. Application layer

6. Presentation layer

5. Session layer

4. Transport layer

3. Network layer

2. Data link Layer

1. Physical Layer


Figure: OSI Model