2 2 Layers in the OSI Model The

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2. 2 Layers in the OSI Model The functions of each layer in the

2. 2 Layers in the OSI Model The functions of each layer in the OSI model is briefly described. The topics discussed in this section include: Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer Summary of Layers TCP/IP Protocol Suite 2

Figure 2. 4 Physical layer TCP/IP Protocol Suite 3

Figure 2. 4 Physical layer TCP/IP Protocol Suite 3

Note: The physical layer is responsible for the movement of individual bits from one

Note: The physical layer is responsible for the movement of individual bits from one hop (node) to the next. TCP/IP Protocol Suite 4

Figure 2. 5 Data link layer TCP/IP Protocol Suite 5

Figure 2. 5 Data link layer TCP/IP Protocol Suite 5

Note: The data link layer is responsible for moving frames from one hop (node)

Note: The data link layer is responsible for moving frames from one hop (node) to the next. TCP/IP Protocol Suite 6

Figure 2. 6 Hop-to-hop delivery TCP/IP Protocol Suite 7

Figure 2. 6 Hop-to-hop delivery TCP/IP Protocol Suite 7

Figure 2. 7 Network layer TCP/IP Protocol Suite 8

Figure 2. 7 Network layer TCP/IP Protocol Suite 8

Note: The network layer is responsible for the delivery of individual packets from the

Note: The network layer is responsible for the delivery of individual packets from the source host to the destination host. TCP/IP Protocol Suite 9

Figure 2. 8 Source-to-destination delivery TCP/IP Protocol Suite 10

Figure 2. 8 Source-to-destination delivery TCP/IP Protocol Suite 10

Figure 2. 9 Transport layer TCP/IP Protocol Suite 11

Figure 2. 9 Transport layer TCP/IP Protocol Suite 11

Note: The transport layer is responsible for the delivery of a message from one

Note: The transport layer is responsible for the delivery of a message from one process to another. TCP/IP Protocol Suite 12

Figure 2. 10 Reliable process-to-process delivery of a message TCP/IP Protocol Suite 13

Figure 2. 10 Reliable process-to-process delivery of a message TCP/IP Protocol Suite 13

Figure 2. 11 Session layer TCP/IP Protocol Suite 14

Figure 2. 11 Session layer TCP/IP Protocol Suite 14

Figure 2. 12 Presentation layer TCP/IP Protocol Suite 15

Figure 2. 12 Presentation layer TCP/IP Protocol Suite 15

Figure 2. 13 Application layer TCP/IP Protocol Suite 16

Figure 2. 13 Application layer TCP/IP Protocol Suite 16

Figure 2. 14 Summary of layers TCP/IP Protocol Suite 17

Figure 2. 14 Summary of layers TCP/IP Protocol Suite 17

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