3 OSI Model

Question 1

What is the OSI model?

Answer 1

Open Standard Interconnection: It is made up of 7 Different Layers
It was developed by the International Organization for Standardization, (ISO) standards.

Question 2

What are the Layers of the OSI Model?

Answer 2

From TOP to BOTTOM:

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

Question 3

Describe Layer 1 the PHYSICAL Layer

Answer 3

this is where bits are transmitted across the network and includes all the physical
and electrical characteristics of this network. So, this is going to tell us whether we’re using an ethernet network, whether we’re using fiber or copper cables,
whether we’re using Cat 5 or Cat 6, and even if we’re using radio frequency in the case of Wi-Fi. Regardless of which method we’re using to send our data across this first layer, it’s always going to occur as Binary BITS. 1s and 0s

The Physical Layer also includes all the different Physical Topologies.

Question 4

Describe Layer 2 the DATALINK Layer

Question 5

Describe Layer 3 NETWORK Layer

Question 6

Describe Layer 4 the TRANSPORT Layer

Question 7

Describe Layer 5 the SESSIONS Layer

Question 8

Describe Layer 6 the PRESINTATION Layer

Question 9

Describe Layer 7 the APPLICATION Layer

Question 10

Memory Aid 7 Layers From Bottom to Top

Answer 10

7) The APPLICATION LAYER: All——————Away
6) The PRESINTATION LAYER: Presidents——-Pizza
5) The SESSIONS LAYER: Say—————–Sausage
4) The TRANSPORT LAYER: They—————Throw
3) The NETWORK LAYER: Never————–Not
2) The DATA LINK LAYER: Did —————-Do
1) The PHYSICAL LAYER: Pot —————Please

Question 11

Memory Aid PDU’s

Answer 11

7) The APPLICATION LAYER: (A)t———-(D)inner DATA
6) The PRESINTATION LAYER: “ “ “
5) The SESSIONS LAYER: “ “ “
4) The TRANSPORT LAYER: (T)he ——- (S)ervers SEGMENTS
3) The NETWORK LAYER: (N)ever —–(P)ut PACKETS
2) The DATA LINK LAYER: (D)ishes —-(F)or FRAMES
1) The PHYSICAL LAYER: (P)izza ——(B)its BITS

Question 12

Describe Encapsulation.

Answer 12

Encapsulation is the process of wrapping data with protocol information at each layer of the OSI model as it passes down the networking stack. Layer 7–1

Question 13

Describe Decapsulation

Answer 13

Decapsulation is the process of removing that protocol information layer by layer
as the data unpacks itself on the receiving end. Layer 1–7

Question 14

What is Transition Modulation

Answer 14

Transition modulation is a change from one state to another. For example from a 1 Bit to a 0 Bit with the use of electrical voltage or a fiber light.