OSI MODEL

Question 1

What is the OSI Model?

Answer 1

OSI : Open Systems Interconnection Model. It was developed in 1977 by the international organization for standardization(ISO)

ISO 7498-> OSI Model. This is our reference model

Question 2

What is the other model closest to the way our network operate today?

Answer 2

TCP /IP model

Question 3

What are the 7 layers of the OSI model?

Answer 3

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

Question 4

What is the purpose of a network?

Answer 4

To make data flow across the network

Question 5

How the data flow in the OSI Model?

Answer 5

Use the mnemonic
Do DATA DATA DATA (Layer 7,6,5)
Some SEGMENTS (Layer 4)
People PACKETS (Layer 3)
Fear FRAMES (Layer 2)
Birthdays BITS (Layer 1)

Question 6

What is encapsulation?

Answer 6

Encapsulation is the process of wrapping up with protocol information at each layer of the OSI model as it passing down through the network stack

Question 7

What is decapsulation?

Answer 7

It’s the process of removing protocol information layer by layer as the data unpacks itself and move up through the OSI Model

Question 8

What is Wireshark?

Answer 8

It’s a network protocol analyzer that captures and displays the data as it travels back and forth through the network. Purpose : Inspection , analysis, troubleshooting