OSI Layer Questions and Answers

OSI Layer Questions and Answers

Question 1. Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?

Answer 1. The Application layer is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses).

Question 2. Which layer is responsible for converting data packets from the Data Link layer into electrical signals?

Answer 2. The Physical layer takes frames from the Data Link layer and encodes the 1s and 0s into a digital signal for transmission on the network medium.

Question 3. At which layer is routing implemented, enabling connections and path selection between two end systems?

Answer 3. The Network layer provides routing through an internetwork and logical addressing.

Question 4. Which layer defines how data is formatted, presented, encoded, and converted for use on the network?

Answer 4. The Presentation layer makes sure that data is in a readable format for the Application layer.

Question 5. Which layer is responsible for creating, managing, and terminating sessions between applications?

Answer 5. The Session layer sets up, maintains, and terminates sessions between applications.

Question 6. Which layer ensures the trustworthy transmission of data across a physical link and is primarily concerned with physical addressing, line discipline, network topology, error notification, ordered delivery of frames, and flow control?

Answer 6. PDUs at the Data Link layer are called frames and provide physical addressing, plus other options to place packets on the network medium.

Question 7. Which layer is used for reliable communication between end nodes over the network and provides mechanisms for establishing, maintaining, and terminating virtual circuits; transport-fault detection and recovery; and controlling the flow of information?

Answer 7. The Transport layer uses virtual circuits to create a reliable connection between two hosts.

Question 8. Which layer provides logical addressing that routers will use for path determination?

Answer 8. The Network layer provides logical addressing, typically IP addressing and routing.

Question 9. Which layer specifies voltage, wire speed, and pinout cables and moves bits between devices?

Answer 9. The Physical layer is responsible for the electrical and mechanical connections between devices.

Question 10. Which layer combines bits into bytes and bytes into frames, uses MAC addressing, and provides error detection?

Answer 10. The Data Link layer is responsible for the framing of data packets.

Question 11. Which layer is responsible for keeping the data from different applications separate on the network?

Answer 11. The Session layer creates sessions between different hosts’ applications.

Question 12. Which layer is represented by frames?

Answer 12. The Data Link layer frames packets received from the Network layer.

Question 13. Which layer is represented by segments?

Answer 13. The Transport layer segments user data.

Question 14. Which layer is represented by packets?

Answer 14. The Network layer creates packets out of segments handed down from the Transport layer.

Question 15. Which layer is represented by bits?

Answer 15. The Physical layer is responsible for transporting 1s and 0s (bits) in a digital signal.

Question 16. Put the following in order of encapsulation:

Packets

Frames

Bits

Segments

Answer 16. Segments, packets, frames, bits

Question 17. Which layer segments and reassembles data into a data stream?

Answer 17. Transport

Question 18. Which layer provides the physical transmission of the data and handles error notification, network topology, and flow control?

Answer 18. Data Link

Question 19. Which layer manages device addressing, tracks the location of devices on the network, and determines the best way to move data?

Answer 19. Network

Question 20. What is the bit length and expression form of a MAC address?

Answer 20. 48 bits (6 bytes) expressed as a hexadecimal number