OSI Model

Question 1

OSI Model: What are the 7 Layers of the OSI Model starting with the top layer?

Answer 1

7. Application Layer
8. Presentation Layer
9. Session Layer
10. Transport Layer
11. Network Layer
12. Data Link Layer
13. Physical Layer

Question 2

OSI Model: What is Layer 7?

Answer 2

Application Layer - Human-computer interaction layer, where applications can access the network services

Question 3

OSI Model: What is Layer 6?

Answer 3

Presentation Layer - Ensures that data is in a usable format and is where data encryption occurs

Question 4

OSI Model: What is Layer 5?

Answer 4

Session Layer - Maintains connections and is responsible for controlling ports and sessions

Question 5

OSI Model: What is Layer 4?

Answer 5

Transport Layer - Transmits data using transmission protocols including TCP and UDP

Question 6

OSI Model: What is Layer 3?

Answer 6

Network Layer - Decides which physical path the data will take

Question 7

OSI Model: What is Layer 2?

Answer 7

Data Link Layer - Defines the format of data on the network

Question 8

OSI Model: What is Layer 1?

Answer 8

Physical Layer - Transmits raw bit stream over the physical medium

Question 9

OSI Model: What is the difference between Layer 3 and Layer 2?

Answer 9

Layer 3 is the Network Layer and it decides which physical path the data will take

Where as

Layer 2 is the Data Link Layer and it defines the format of data on the network

Question 10

Human-computer interaction layer, where applications can access the network services. Protocols are the Hypertext Transfer Protocol (HTTP), File Transfer Protocol (FTP), Post Office Protocol (POP), Simple Mail Transfer Protocol (SMTP), and Domain Name System (DNS).

Answer 10

Application Layer 7

Question 11

Ensures that data is in a usable format and is where data encryption occurs. It defines how two devices should encode, encrypt, and compress data so it is received correctly on the other end.

Answer 11

Presentation Layer 6

Question 12

Maintains connections and is responsible for controlling ports and sessions. It is responsible for opening sessions, ensuring they remain open and functional while data is being transferred, and closing them when communication ends.

Answer 12

Session Layer 5

Question 13

Transmits data using transmission protocols including TCP and UDP. It is responsible for reassembling the segments on the receiving end, turning it back into data that can be used by the session layer.

Answer 13

Transport Layer 4

Question 14

Decides which physical path the data will take. Breaking up segments into network packets, and reassembling the packets on the receiving end. Routing packets by discovering the best path across a physical network. It typically uses IP address to route packets to a destination.

Answer 14

Network Layer 3

Question 15

Defines the format of data on the network. Establishes and terminates a connection between two physically-connected nodes on a network. It breaks up packets into frames and sends them from source to destination. MAC is on this layer

Answer 15

Data Link Layer 2

Question 16

Transmits raw bit stream over the physical medium

Answer 16

Physical Layer 1

Question 17

Give me the easy mnemonic for the OSI Model

Answer 17

All People Seem to Need Data Processing