NET1L - Lesson 3 (Reference Models - Data Encapsulation)

is used to modularize the operations of a network into manageable layers.

• Layered model

• Single model

• Stacked model

What are the benefits of using a layered model?

• Assisting in protocol design

• Fostering competition

• Preventing technology or capability changes in one layer from affecting other layers above and below

• Providing a common language to describe networking functions and capabilities

• Preventing competition

What are the two layered models that are used to describe network operations?

• Open System Interconnection (OSI) Reference Model

• TCP/IP Reference Model

• AppleTalk Reference Model

• Novell NetWare Reference Model

A networking model is only a representation of a network operation.

The model is the actual network.

• True

• False

The OSI Reference model provides consistency by describing what must be done at a particular layer, but not prescribing how it should be accomplished.

• True

• False

What are the 7 Layers in OSI Model Layer?

Layer 7 - Application

Layer 6 - Presentation

Layer 5-1 - ?????????????

• Session

• Transport

• Network

• Data Link

• Physical

Contains protocols used for process-to-process communications.

• Application

• Presentation

• Session

• Transport

Provides for common representation of the data transferred between application layer services.

• Application

• Presentation

• Session

• Transport

Provides services to the presentation layer to organize its dialogue and to manage data exchange.

• Application

• Presentation

• Session

• Transport

Defines services to segment, transfer, and reassemble the data for individual communications between the end devices.

• Application

• Presentation

• Session

• Transport