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OSI Model Presentation Transcript
1.The OSI Model and the TCP/IP Protocol Suite
2.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 (OSI) model. It was first introduced in the late 1970s.
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 (OSI) model. It was first introduced in the late 1970s.
3.ISO is the organization. OSI is the model
4.The OSI model
5.OSI layers
6.An exchange using the OSI model
7.Layers in the OSI Model
8.Physical layer
9.The physical layer is responsible for the movement of individual bits from one hop (node) to the next.
10.Data link layer
11.The data link layer is responsible for moving frames from one hop (node) to the next.
12.Hop-to-hop delivery
13.Network layer
14.The network layer is responsible for the delivery of individual packets from the source host to the destination host.
15.Source-to-destination delivery
16.Transport layer
17.The transport layer is responsible for the delivery of a message from one process to another.
18.Reliable process-to-process delivery of a message
19.Session layer
20.Presentation layer
21.Application layer
22.TCP/IP Protocol Suite
The TCP/IP protocol suite is made of five layers: physical, data link, network, transport, and application. The first four layers provide physical standards, network interface, internetworking, and transport functions that correspond to the first four layers of the OSI model. The three topmost layers in the OSI model, however, are represented in TCP/IP by a single layer called the application layer.
The TCP/IP protocol suite is made of five layers: physical, data link, network, transport, and application. The first four layers provide physical standards, network interface, internetworking, and transport functions that correspond to the first four layers of the OSI model. The three topmost layers in the OSI model, however, are represented in TCP/IP by a single layer called the application layer.
23.Addressing
Three different levels of addresses are used in an internet using the TCP/IP protocols: physical (link) address, logical (IP) address, and port address.
Three different levels of addresses are used in an internet using the TCP/IP protocols: physical (link) address, logical (IP) address, and port address.
24.Relationship of layers and addresses in TCP/IP
25.In Figure 2.18 a node with physical address 10 sends a frame to a node with physical address 87. The two nodes are connected by a link. At the data link level this frame contains physical (link) addresses in the header. These are the only addresses needed. The rest of the header contains other information needed at this level. The trailer usually contains extra bits needed for error detection.
26.Physical addresses
27.IP Versions
IP became the official protocol for the Internet in 1983. As the Internet has evolved, so has IP. There have been six versions since its inception. We look at the latter three versions here.
IP became the official protocol for the Internet in 1983. As the Internet has evolved, so has IP. There have been six versions since its inception. We look at the latter three versions here.
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