Communicating through the network

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1.Table of Contents :
Structure of a network (including the different materials and medias necessary for successful communications).

Types of networks.

Explain the function of the different protocols in charge of the communication in the network.

Explain the advantages of using a layer model to describe the function of a network.

Describe the role of each layer of the most used models in networking: TCP/IP, OSI.

2.Structure of a network :

  • There are 3 elements of communication :

The source of the information

The Channel

The destination of the information

  • Definition of a network:

Data or information of a network, capable of transmitting      different types of communications.

  • How information is communicated:

Data is sent through the network as segments.

  • Components of a network:

Hardware and softwares

  • End devices and their role in the network:

End devices form interfaces with human networks and communication networks.

Their roles are: Clients, Servers, Client and server at the same time.

3.Types of networks :

  • Local Area Networks (LANs): A local network, it can be established in a house, building, or campus.
  • Wide Area Networks (WANs): These are LANs but geographically distant and are connected with each other using WANs.
  • Internet: Is a multiple networks interconnected with each other.

4.Functions of different protocols :

  • A protocol is a group of predetermined rules.
  • Network protocols are used to allow devices to communicate successfully.
  • There are many protocols: HTTP, TCP, IP, and Ethernet.
  1. Advantages of using a layer model :

The advantages are:

  • Assisting protocol schema
  • Competition augmentation
  • Changes in a certain layer don’t impact the other layers.
  • Provides a common language.
  1. The roles of each of these layers:
  • TCP/IP model:

Application: contains standard network applications (Telnet, SMTP, FTP)

Transport: Performs host to host communication.

Internet: Provides data packets (datagrams).

Network access: Specifies the format of the data.

  • OSI model:

Application: profides the interface with applications.

Presentation: defines the format of the manipulated data.

Session: defines the opening and destruction of data.

Transport: is in charge of data transport.

Network: manages the addressing and routing of data.

Data Link: defines the interface with the network adapter and the sharing of the transmission media.