chapter 01 - 2.1 Chapter 1 Network Models (OSI and TCP/IP)...

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Unformatted text preview: 2.1 Chapter 1 Network Models (OSI and TCP/IP) 2.2 1-1 LAYERED TASKS 1-1 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 communicate example, let us consider two friends who communicate through postal mail. The process of sending a letter to a through postal mail. The process of sending a letter to a friend would be complex if there were no services friend would be complex if there were no services available from the post office. available from the post office. Sender, Receiver, and Carrier Hierarchy Topics discussed in this section: Topics discussed in this section: 2.3 Figure 1.1 Tasks involved in sending a letter 2.4 1-2 THE OSI MODEL 1-2 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. worldwide agreement on international standards. An ISO standard that covers all aspects of network An ISO standard that covers all aspects of network communications is the Open Systems Interconnection communications is the Open Systems Interconnection ( ( OSI OSI ) model. ) model. It was first introduced in the late 1970s. It was first introduced in the late 1970s. Layered Architecture Peer-to-Peer Processes Encapsulation Topics discussed in this section: Topics discussed in this section: ISO is the organization. OSI is the model. Note 2.5 Figure 1.2 Seven layers of the OSI model 2.6 Figure 1.3 The interaction between layers in the OSI model 2.7 Figure 1.4 An exchange using the OSI model 2.8 1.3 LAYERS IN THE OSI MODEL 1.3 LAYERS IN THE OSI MODEL In this section we briefly described the functions of each In this section we briefly described the functions of each layer in the OSI model. layer in the OSI model. Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer Topics discussed in this section: Topics discussed in this section: 2.9 Figure 1.5 Physical layer 2.10 The physical layer is responsible for movements of individual bits from one hop (node) to the next. Note The responsibility of physical layer is to coordinate the functions required to transmit a bit stream over a physical medium The duties are Defines the characteristics of the interface between devices and transmission medium Type of transmission medium, topology, etc Representation of bits Encoding, voltage level, duration etc Data rate Synchronization of bits Senders and receivers clock synchronization 2.11 Figure 1.6 Data link layer 2.122....
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chapter 01 - 2.1 Chapter 1 Network Models (OSI and TCP/IP)...

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