Question 1

What is the correct order of the OSI model layers from Layer 1 to Layer 7?

Accepted 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)?

Accepted 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?

Accepted 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?

Accepted 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?

Accepted Answer

Layer 5, the Session layer, sets up, coordinates, and ends conversations (sessions) between applications on different devices.

OSI & TCP/IP Models – CompTIA Network+ Flashcards

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