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We use the concept of layers in our daily life As an example, let us consider two friends who communicate through postal maiL The process of sending a letter to a friend would be complex if there were no services available from the post office Figure 21 shows the steps in this task
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The letter is written, put in an envelope, and dropped in a mailbox
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The letter is carried from the mailbox to a post office
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The letter is carried from the post office to the mailbox
The letter is delivered
to a carrier by the post
Lower layers
office
The letter is delivered from the carrier to the post office
The parcel is carried from the source to the destination
Sender, Receiver, and Carrier
In Figure 21 we have a sender, a receiver, and a carrier that transports the letter There is a hierarchy of tasks
At the Sellder Site
Let us first describe, in order, the activities that take place at the sender site Higher layer The sender writes the letter, inserts the letter in an envelope, writes the sender and receiver addresses, and drops the letter in a mailbox Middle layer The letter is picked up by a letter carrier and delivered to the post office Lower layer The letter is sorted at the post office; a carrier transports the letter
011 the Way
The letter is then on its way to the recipient On the way to the recipient's local post office, the letter may actually go through a central office In addition, it may be transported by truck, train, airplane, boat, or a combination of these
At the Receiver Site
Lower layer The carrier transports the letter to the post office Middle layer The letter is sorted and delivered to the recipient's mailbox Higher layer The receiver picks up the letter, opens the envelope, and reads it
SECTION 22
THE OS! MODEL
Hierarchy
According to our analysis, there are three different activities at the sender site and another three activities at the receiver site The task of transporting the letter between the sender and the receiver is done by the carrier Something that is not obvious immediately is that the tasks must be done in the order given in the hierarchy At the sender site, the letter must be written and dropped in the mailbox before being picked up by the letter carrier and delivered to the post office At the receiver site, the letter must be dropped in the recipient mailbox before being picked up and read by the recipient Services Each layer at the sending site uses the services of the layer immediately below it The sender at the higher layer uses the services of the middle layer The middle layer uses the services of the lower layer The lower layer uses the services of the carrier The layered model that dominated data communications and networking literature before 1990 was the Open Systems Interconnection (OSI) model Everyone believed that the OSI model would become the ultimate standard for data communications, but this did not happen The TCPIIP protocol suite became the dominant commercial architecture because it was used and tested extensively in the Internet; the OSI model was never fully implemented In this chapter, first we briefly discuss the OSI model, and then we concentrate on TCPIIP as a protocol suite
THE OSI MODEL
Established in 1947, the International Standards Organization (ISO) is a multinational body dedicated to worldwide agreement on international standards An ISO standard that covers all aspects of network communications is the Open Systems Interconnection model It was first introduced in the late 1970s An open system is a set of protocols that allows any two different systems to communicate regardless of their underlying architecture The purpose of the OSI model is to show how to facilitate communication between different systems without requiring changes to the logic of the underlying hardware and software The OSI model is not a protocol; it is a model for understanding and designing a network architecture that is flexible, robust, and interoperable
ISO is the organization OSI is the model
The OSI model is a layered framework for the design of network systems that allows communication between all types of computer systems It consists of seven separate but related layers, each of which defines a part of the process of moving information across a network (see Figure 22) An understanding of the fundamentals of the OSI model provides a solid basis for exploring data communications
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