DCN_2_Layering+in+Networked+computing - Layering in...

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Layering in Networked computing
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2.2 LAYERED TASKS We use the concept of We use the concept of layers layers in our daily life. As an in our daily life. As an example, let us consider two friends who example, let us consider two friends who communicate through postal mail. communicate through postal mail. The process of sending a letter to a friend would be The process of sending a letter to a friend would be complex if there were no services available from the complex if there were no services available from the post office. post office.
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Tasks involved in sending a letter
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What is layering in Networked computing? Breaks down communication into smaller, simpler parts…………….
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Why a layered model? Easier to teach communication process . Speeds development, changes in one layer does not affect how the other levels works. Standardization across manufactures . Allows different hardware and software to work together . Reduces complexity
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Layering in Networked computing OSI Model TCP/IP Model
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Learning Outcomes ? Understand the need of layering in Networked computing Understand the need of layering in Networked computing Understand the OSI model and the TCP/IP model Understand the OSI model and the TCP/IP model Understand the function protocols and their role at each layer. Understand the function protocols and their role at each layer. Understand the role of header in communication between Understand the role of header in communication between layers layers Understand how data sent from one host arrive to the Understand how data sent from one host arrive to the target host. target host.
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The OSI Reference Model
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ISO is the organization. OSI is the model. Note
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THE OSI MODEL Established in 1947, the International Standards Established in 1947, the International Standards Organization ( Organization ( ISO ISO ) is a multinational body dedicated to ) is a multinational body dedicated to worldwide agreement on international standards. An ISO worldwide agreement on international standards. An ISO standard that covers all aspects of network standard that covers all aspects of network communications is the Open Systems Interconnection communications is the Open Systems Interconnection ( ( OSI OSI ) model. It was first introduced in the late 1970s. ) model. It was first introduced in the late 1970s.
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Seven layers of the OSI model
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The Postal Analogy A- Write a 20 page letter to a foreign country. P- Translate the letter so the receiver can read it. S- Ensure the intended recipient can receive letter. T- Separate and number pages. Like registered mail, tracks delivery and requests another package if one is “lost” or “damaged” in the mail. N- Postal Center sorting letters by zip code to route them closer to destination.
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