OSI reference model for data networks

What is the OSI reference model?

• A cabling standard for networking

• A computer architecture blueprint

• A network architecture blueprint

• A network device architecture blueprint

How does the OSI reference model ensure independence of layer functionality?

• By encapsulating data at each layer and defining interfaces between layers

• By allowing device manufacturers to implement proprietary layers

• By allowing communication between computer hosts over a network

• By optimising the network route between hosts

The OSI presentation layer...

• Segments and delivers data, correcting transmission errors

• Opens and maintains comm's channels, authenticating data comm's.

• Converts data, encrypts data, and translates data

• Manages the user interface and processes data before handing it off to the user

The OSI application layer...

• Segments and delivers data, correcting transmission errors

• Opens and maintains comm's channels, authenticating data comm's.

• Converts data, encrypts data, and translates data

• Manages the user interface and processes data before handing it off to the user

The OSI session layer...

• Segments and delivers data, correcting transmission errors

• Opens and maintains comm's channels, authenticating data comm's.

• Converts data, encrypts data, and translates data

• Manages the user interface and processes data before handing it off to the user

The OSI network layer...

• Segments and delivers data, correcting transmission errors.

• Manages electrical, optical, and radio transmission of data bits

• Routes data frames locally and manages local physical addressing

• Routes data packets between networks and manages global logical addressing

The OSI transport layer...

• Segments and delivers data, correcting transmission errors

• Opens and maintains comm's channels, authenticating data comm's.

• Converts data, encrypts data, and translates data

• Manages the user interface and processes data before handing it off to the user

The OSI data link layer...

• Segments and delivers data, correcting transmission errors.

• Manages electrical, optical, and radio transmission of data bits

• Routes data frames locally and manages local physical addressing

• Routes data packets between networks and manages global logical addressing

The OSI physical layer...

• Segments and delivers data, correcting transmission errors.

• Manages electrical, optical, and radio transmission of data bits

• Routes data frames locally and manages local physical addressing

• Routes data packets between networks and manages global logical addressing