UPPER and LOWER Layer tutorials

 

UPPER LAYER

  • Primarily, the upper layers of the OSI model define communications between applications that reside on end-user stations.

  • This is generally related to software communication.

  • It includes following 3 OSI Layers

Layer Number

Layer Name

Control Information name

7

Application Layer

Data

6

Presentation Layer

Data

5

Session Layer

Data

 

LOWER LAYER

  • The lower layer of OSI model focus on data transportation.

  • It is achieved with the help of Router, Switch, Physical Cable or Wifi.

  • It includes following 4 OSI Layers.

Layer Number

Layer Name

Control Information Name

4

Transport Layer

Segment

3

Network Layer

Packet

2

Data Link Layer

Frame

1

Physical Layer

Bit

 

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