OSI Model

Question 1

Physical Layer

Answer 1

(1) Responsible for physical connections of devices in the network. EX: Hubs, repeaters, modems, and physical cabling

Question 2

Data Link Layer

Answer 2

(2) Responsible for error-free delivery of data to the receiving device or node. EX: Switches, bridge devices, network interface (wireless/wired network cards)

Question 3

Network Layer

Answer 3

(3) Responsible for the transmission of data between hosts in different networks as well as routing of data packets. EX: Routers, some switches

Question 4

Transport Layer

Answer 4

(4) Responsible for reliable delivery of data. Provide services to the application layer and receives services from the network layer. Segment and reassemble data in the correct order for it to be sent to the receiving device. Handle reliable delivery of data and any retries of data that are lost or corrupted. “Heart of OSI”

Question 5

Session Layer

Answer 5

(5) Responsible for connection establishment, session maintenance, and authentication.

Question 6

Presentation

Answer 6

(6) Responsible for encrypting data as it is sent.

Question 7

Application

Answer 7

(7) When a browser is opened and typing the web address into the search bar.