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Question 1
What is the correct order of the OSI model layers from Layer 1 to Layer 7?
Answer: Physical, Data Link, Network, Transport, Session, Presentation, Application (mnemonic: 'Please Do Not Throw Sausage Pizza Away').
Question 2
What is the primary function of the OSI Physical layer (Layer 1)?
Answer: It transmits raw binary bits (0s and 1s) over a physical medium, defining electrical signals, voltage levels, and physical connectors.
Question 3
Which OSI layer is responsible for logical addressing and routing packets between networks?
Answer: Layer 3, the Network layer, handles logical (IP) addressing and determines the best path for routing packets across different networks.
Question 4
What two functions does the OSI Data Link layer (Layer 2) perform?
Answer: The Data Link layer handles physical (MAC) addressing and provides error detection via CRC, and is divided into the LLC and MAC sublayers.
Question 5
Which OSI layer is responsible for establishing, managing, and terminating sessions between applications?
Answer: Layer 5, the Session layer, sets up, coordinates, and ends conversations (sessions) between applications on different devices.