Open Systems Interconnection Model (OSI)

Question 1

OSI Layer 1

Answer 1

Physical Layer

This is the lowest layer and deals with the physical aspects of data transmission, such as cables, connectors, and electrical signals. It defines how data is transmitted over the physical medium.

Question 2

OSI Layer 2

Answer 2

Data Link Layer

This layer is responsible for creating a reliable link between two directly connected nodes, such as neighboring devices on a local network. It manages issues like data framing and error detection.

Question 3

OSI Layer 3

Answer 3

Network Layer

The network layer is concerned with routing data packets between different networks or subnets. It determines the optimal path for data to travel from the source to the destination.

Question 4

OSI Layer 4

Answer 4

Transport Layer

This layer manages end-to-end communication and ensures that data is reliably delivered between devices. It handles issues like data segmentation, flow control, and error correction.

Question 5

OSI Layer 5

Answer 5

Session Layer

The session layer establishes, maintains, and terminates communication sessions between two devices. It manages session synchronization and can recover from interruptions in communication.

Question 6

OSI Layer 6

Answer 6

Presentation Layer

This layer is responsible for data translation, encryption, and compression. It ensures that data sent by one device can be understood by the receiving device, regardless of differences in data formats.

Question 7

OSI Layer 7

Answer 7

Application Layer

The top layer, the application layer, interacts directly with end-user applications. It provides services and protocols that enable applications to communicate over the network. Common application layer protocols include HTTP, SMTP, and FTP.