Cisco Certified Network Associate Fast Pass-3rd.Edition by Todd Lammle

By Todd Lammle

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This allows layers to operate transparently to each other, that is, changes in one layer should not impact other layers. 6 Describe the impact of applications (Voice over IP and Video over IP) on a network The main purpose of the Host-to-Host layer is to shield the upper-layer applications from the complexities of the network. ” The following sections describe the two protocols at this layer: Transmission Control Protocol (TCP) User Datagram Protocol (UDP) By understanding how TCP and UDP work, you can interpret the impact of applications on networks when using Voice and Video Over IP.

6 shows the TCP/IP protocol suite and how its protocols relate to the DoD model layers. 6 The TCP/IP protocol suite In the following sections, we will look at the different protocols in more detail, starting with the Process/Application layer protocols. Exam Essentials Remember that the OSI/DoD model is a layered approach. Functions are divided into layers, and the layers are bound together. This allows layers to operate transparently to each other, that is, changes in one layer should not impact other layers.

At the bottom of the DoD model, the Network Access layer monitors the data exchange between the host and the network. fm Page 10 Thursday, September 27, 2007 11:17 AM Chapter 1 10 Describe how a network works OSI model, the Network Access layer oversees hardware addressing and defines protocols for the physical transmission of data. The DoD and OSI models are alike in design and concept and have similar functions in similar layers. 6 shows the TCP/IP protocol suite and how its protocols relate to the DoD model layers.

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