Net + Lesson 4

In today's lesson we will cover more things that have to do with.... NET + hahaha!
Today we are going to talk about the OSI model. Open Systems Interconnection Basic Reference Model
The OSI model has several layers... infact it has 7 whole layers. that's a lot of layers. The Seven Layers are as follows

7. Application
6. Presentation
5.Session
4.Transport
3. Network
2. Data link
1. Physical

Yeah it's back wards... in fact it goes from the bottom up.. kind of weird huh?

Today we are going to cover just two of the OSI model layers! First we'll discuss the Physical layer and the data link layer!

1. Physical layer-
This pretty much controls how data is transmitted across the media.

2. The OSI Data link layer-
The data link layer tells how devices attached to a network gain access to the various computing resources

There are two sub layers in the Data link layer:
-The logical Link control (LLC)
-Media Access Control (MAC)