Chapter-2

What is the purpose of the OSI reference model?

• To provide a framework for the development of protocols

• To standardize network components

• To allow different types of network hardware to communicate

• To divide network communication into smaller parts

Answer explanation

The OSI reference model provides a framework for the development of protocols by standardizing how different network functions interact, ensuring interoperability and guiding protocol design.

What are the seven layers of the OSI model?

• Physical, Data Link, Network, Transport, Session, Presentation, Application

• Application, Presentation, Session, Transport, Network, Data Link, Physical

• Network, Data Link, Transport, Application, Presentation, Session, Physical

• Transport, Network, Data Link, Application, Presentation, Session, Physical

Answer explanation

The correct order of the OSI model layers is Physical, Data Link, Network, Transport, Session, Presentation, and Application. This sequence is essential for understanding network communication protocols.

What is encapsulation in the OSI model?

• The process of adding control information as it passes down

• The process of taking out control information as it passes up

• The form that a piece of data takes at any layer

• The interaction between layers in the OSI model

What is the role of the Application Layer?

• To provide services to the user

• To manage data transfer between devices

• To establish and maintain connections

• To format and present data

Answer explanation

The Application Layer is responsible for providing services directly to the user, enabling applications to communicate over the network. This includes functions like email, file transfer, and web browsing.

What does PDU stand for?

• Protocol Data Unit

• Packet Data Unit

• Physical Data Unit

• Process Data Unit

Answer explanation

PDU stands for Protocol Data Unit, which is a term used in networking to describe a unit of data specified in a protocol of a given layer. The other options do not accurately represent this concept.

What is the function of the Transport Layer?

• To link the user support layers and network support layers

• To provide end-to-end communication services

• To manage data link protocols

• To handle session management

Answer explanation

The Transport Layer is responsible for providing end-to-end communication services, ensuring data is delivered accurately and in order between applications across a network.

What is the significance of layering in network protocols?

• It provides flexibility for modifying protocols

• It simplifies the design of network hardware

• It enhances the speed of data transfer

• It reduces the complexity of network management

What is the main objective of the OSI model?

• To standardize network components

• To allow interoperability among different vendors

• To simplify network troubleshooting

• To enhance data security

What is the function of the Presentation Layer in the OSI Model?

• Coding and conversion of application layer data

• Data compression/decompression

• Data encryption/decryption

• All of the above

What services does the Session Layer provide?

• Establishment, management, and termination of the session

• Dialogue Control

• Synchronization

• All of the above