OSI layer

What does OSI stand for?

• Open Systems Interconnection
• Online Systems Integration
• Operating Systems Interface
• Open Service Interface

Answer explanation

OSI stands for Open Systems Interconnection, a conceptual framework used to understand network interactions in seven layers.

How many layers are there in the OSI model?

• 3
• 5
• 7
• 10

Answer explanation

The OSI model consists of 7 layers, each responsible for specific networking functions.

Which layer of the OSI model is responsible for end-to-end communication and flow control?

• Physical
• Transport
• Application
• Data Link

Answer explanation

The Transport layer (Layer 4) is responsible for reliable end-to-end communication, including flow control and error correction.

Which layer of the OSI model is responsible for routing and packet forwarding?

• Data Link
• Network
• Transport
• Application

Answer explanation

The Network layer (Layer 3) is responsible for routing data packets between different networks and managing IP addresses.

Which OSI layer is responsible for converting data into electrical signals for transmission over physical media?

• Physical
• Data Link
• Transport
• Application

Answer explanation

The Physical layer (Layer 1) converts data into signals for transmission over physical media like cables.

At which layer does encryption and decryption typically occur in the OSI model?

• Application
• Presentation
• Transport
• Session

Answer explanation

The Presentation layer (Layer 6) is responsible for data encryption, decryption, and formatting.

Which layer of the OSI model is responsible for error detection and correction?

• Application
• Transport
• Data Link
• Network

Answer explanation

The Data Link layer (Layer 2) handles error detection and correction during data transmission.

Which of the following is an example of a protocol that operates at the OSI model’s Transport Layer?

• IP
• HTTP
• TCP
• Ethernet

Answer explanation

TCP operates at the Transport layer (Layer 4) and ensures reliable data transmission between hosts.

Which OSI layer handles the organization of data into a readable format and syntax?

• Data Link
• Presentation
• Transport
• Network

Answer explanation

The Presentation layer (Layer 6) ensures data is presented in a readable and standardized format.

Which OSI layer is responsible for establishing, maintaining, and terminating communication between devices?

• Transport
• Session
• Application
• Network

Answer explanation

The Session layer (Layer 5) manages communication sessions between devices, including establishing and terminating connections.