introduction to network ( internet and its layer) or how internet really works!

Introductionto

NetworkIT Entrepreneurship course ( Dr. Meigoonpoury )

Mohammad Kermani, Fall 2015University of Tehran, Faculty of Entrepreneurship

Google history of Network!Let’s start!

To be abstract!

مار

OSI ModelThe Open Systems Interconnection model (OSI Model) is a conceptual model that characterizes and standardizes thecommunication functions of a telecommunication or computing system without regard of their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into abstraction layers. The original version of the model defined seven layers.[WIKIPEDIA]

OSI Model

Internet Protocol Model

What’s inside?

Let’s play!!

How Internet works?

Physical / Network Interface• Wire

• Ethernet• xDSL

• Fiber• GPON• Ethernet

• Wireless• Wifi• Wimax• GSM• 3G/4G

xDSL

xDSL

GPON

Wireless

Multiplexing/Multiple Access• TDM (TDMA)• FDM (FMA)• CDMA• SDMA

Time Division

Frequency Division

Time/Frequency

Code! WOW!

Space Division!!?

Sectors!

Cellular

Cell Planning• Size of cells• Pattern of clusters• Cost Trade-off• Telecom Finance; Erlang, ARPU, etc.

Internet: ISPs and IXPs

Application Layer

Mohammad Kermani

moh.Kermani@gmail.comMoh.Kermani@ut.ac.irtelegram.me/mohkermaniInstagram.com/MohkermaniTwitter: @mohkermaniLinkedin: mohkermani