5. OSI Reference Model Flashcards
What is the OSI Reference Model?
A model developed by ISO in 1978 to enable communication between different operating systems, making network structures easier to understand.
How many layers are in the OSI model?
7 layers.
What is the purpose of the OSI model?
To facilitate communication between different operating systems using a hierarchical, layered architecture.
What is the 1st layer of the OSI model?
The Physical Layer.
What is the role of the Physical Layer?
It transmits data in bits along communication channels without regard for the type or content of the data.
What data format does the Physical Layer work with?
Ordered bit sequences.
What is the 2nd layer of the OSI model?
The Data Link Layer.
What is the main function of the Data Link Layer?
Processes bits from the Physical Layer, prepares them for the next layer, and performs physical addressing and error checking.
What is the 3rd layer of the OSI model?
The Network Layer.
What is the responsibility of the Network Layer?
Delivering data to the destination logical address (IP Address) using logical addressing.
What is the 4th layer of the OSI model?
The Transport Layer.
What is the main function of the Transport Layer?
Ensuring secure and error-free transmission of data through additional controls.
What is the 5th layer of the OSI model?
The Session Layer.
What does the Session Layer do?
Provides necessary services for session management to enable the Presentation Layer to function.
What is the 6th layer of the OSI model?
The Presentation Layer.
What is the role of the Presentation Layer?
Handles data representation, ensuring communicating nodes use a common language.
What is the 7th layer of the OSI model?
The Application Layer.
What does the Application Layer do?
Provides user-level access to network services and is the layer closest to the user.
Which layer is responsible for logical addressing?
The Network Layer.
Which layer is responsible for error checking?
The Data Link Layer.
Which layer handles session management?
The Session Layer.
Which layer provides the user interface for network services?
The Application Layer.
Which layer focuses on data representation and translation?
The Presentation Layer.
