1.1 OSI Model Layers

Question 1

What is the OSI Model Stack from top to bottom?

Hint: Please Do Not Throw Sausage Pizza Away
or All People Seem To Need Data Processing

Answer 1

Layer 7: Application
Layer 6: Presentation
Layer 5: Session
Layer 4: Transport
Layer 3: Network
Layer 2: Data Link
Layer 1: Physical

Question 2

What does Layer 1 of the OSI Model include and what is it’s Protocol Data Unit (PDU)?

Answer 2

Media, signal, and binary transmission. The physical hardware.
PDU: Bit

Question 3

What does Layer 2 of the OSI Model include and what is it’s Protocol Data Unit (PDU)?

Answer 3

Gets the data to the physical layer. Also handles error correction.
Sub layers are: Logical Link Control (LLC) and MAC (Physical) Addressing
Ethernet
PDU: Frame

Question 4

What does Layer 3 of the OSI Model include and what is it’s Protocol Data Unit (PDU)?

Answer 4

Path determination and IP (Logical) Addressing.
PDU: Packet

Question 5

What does Layer 4 of the OSI Model include and what is it’s Protocol Data Unit (PDU)?

Answer 5

End to end connections and reliability.
TCP and UDP.
PDU: Segment

Question 6

What does Layer 5 of the OSI Model include?

Answer 6

Synchronizes data between
applications on two different
devices.

Question 7

What does Layer 6 of the OSI Model include?

Answer 7

Data encoding and encryption.

Question 8

What does Layer 7 of the OSI Model include?

Answer 8

Serves to provide processes
that enable applications to use
network services.

Question 9

What is the TCP/IP Stack from top to bottom?

Answer 9

Layer 4: Application
Layer 3: Transport
Layer 2: Internet
Layer 1: Network Access