OSI 2

Question 1

What is the Physical layer?

Answer 1

Transmits raw bits over a physical medium (Cables, Switches, Hubs)

Question 2

What is the Data Link layer?

Answer 2

Provides node-to-node data transfer and handles error correction from the Physical layer (Frames, MAC addresses, Ethernet, Switches)

Question 3

What is the Network layer?

Answer 3

Manages data routing, packet forwarding and logical addressing (IP addresses, Routers, Packets)

Question 4

What is the Transport layer?

Answer 4

Ensures complete data transfer with error checking and flow control (TCP/UDP, segments, reliability)

Question 5

What is the Session layer?

Answer 5

Manages sessions, mantains connections and synchronises data exchange

Question 6

What is the Presentation layer?

Answer 6

Translates data between the application layer and the Network format, encryption and compression

Question 7

What is the Application layer?

Answer 7

Interfaces directly with end-user applications (HTTP, user applications)

Question 8

What is encapsulate/decapsulation?

Answer 8

Encapsulation adds headers and trailers as data moves down the OSI model. Decapsulation removes headers and trailers as data moves up the OSI model.