Concept Exercise Chapter 14 Name:

Date: Class:

Cisco Exercises - Semester 1 - Networking Fundamentals

Chapter 14 Layer 6: The Presentation Layer

Introduction

Layer 6 of the OSI reference model, the presentation layer, provides code formatting and conversion. Code formatting is used to make sure that applications have meaningful information to process. If necessary, this layer can translate between different data formats.

The presentation layer is not only concerned with the format and representation of data. It is also concerned with the data structure that the programs used. Thus, Layer 6 arranges for Layer 7 how data will be organized when it is transferred.

Concept Questions

Demonstrate your knowledge of these concepts by answering the following questions in the space provided.

Layer 6 standards also guide how graphic images are presented. What standards for graphic images do Layer 6 employ?

For example, PICT, a picture format used to transfer QuickDraw graphics between Macintosh and PowerPC programs, can be used. Another presentation format that can be used is the tagged image file format, or TIFF. Typically, TIFF is used for high-resolution, bit-mapped images. Another Layer 6 standard that can be used for graphic images is from the Joint Photographic Experts Group, which is generally referred to as JPEG. Explain how Layer 6 structures the data for Layer 7 to transfer.

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