Computer Networks
Definition networks:
Computer network consists of at least two callers to each other, with the possibility of exchanging data and information between them where these networks allow
(Information, applications, files, data and computing resources such as a printer)
And also allows users to communicate immediately.
Computer network consists of at least two callers to each other, with the possibility of exchanging data and information between them where these networks allow
(Information, applications, files, data and computing resources such as a printer)
And also allows users to communicate immediately.
Imagine:
At first let us imagine a computer without a network, in this case how will exchange data?
We'll need to drive hundreds soft to transfer information from one device to another, which
Cause a big waste of time and effort, and another example if we have one printer And several computers in this case, if we print Either we will Cessation in queue on Mosul printer device, or we'll move Printer to each user to take her to his machine prints what he wants and in both Two great trouble, and here we see that the networking technology has evolved to meet The growing need to share information and resources effectively.
Thus emerged two types of electronic accounting:
Central Accounting
Distributed Accounting
We'll need to drive hundreds soft to transfer information from one device to another, which
Cause a big waste of time and effort, and another example if we have one printer And several computers in this case, if we print Either we will Cessation in queue on Mosul printer device, or we'll move Printer to each user to take her to his machine prints what he wants and in both Two great trouble, and here we see that the networking technology has evolved to meet The growing need to share information and resources effectively.
Thus emerged two types of electronic accounting:
Central Accounting
Distributed Accounting
Rated networks
Classification by distance
Classification by distance
LAN(Local Area Network)
At the beginning of the emergence of networks consisting of a small number of devices may not exceed Ten, and connected with a printing device, this type of networking has become known as the (LAN) Local Area Network .
Network or a local scale, and despite the fact that current technology
Allow local networks to adapt and deal with a much larger number of users they are still
Operate within a limited space The LAN networks normally be contained within, office, or group From offices in one building, and offers these networks at the present time
Great speed to share data and resources which the user feels that these resources stored on his PC.
At the beginning of the emergence of networks consisting of a small number of devices may not exceed Ten, and connected with a printing device, this type of networking has become known as the (LAN) Local Area Network .
Network or a local scale, and despite the fact that current technology
Allow local networks to adapt and deal with a much larger number of users they are still
Operate within a limited space The LAN networks normally be contained within, office, or group From offices in one building, and offers these networks at the present time
Great speed to share data and resources which the user feels that these resources stored on his PC.
MAN (Metropolitan Area Networks)
Network medium for City-wide networks or
Which is another type of classification networks based on the technology of LAN networks
But working at high speeds and are usually used as arguments connection fiber optic,
And are usually cover a wide area ranging from 20 to 100 kilometers.
Which is another type of classification networks based on the technology of LAN networks
But working at high speeds and are usually used as arguments connection fiber optic,
And are usually cover a wide area ranging from 20 to 100 kilometers.
WAN (Wide Area Network)
At the beginning of the emergence of networks cannot support LAN network needs
Large companies offices spread over vast areas, perhaps on a
Several countries, this had to be the development of a new type of network that joins networks Local in different parts of the country or that the linking local networks in countries Different, and launched on this type of network name Wide Area Network (WAN
Or broadband networks, and using this technique the increasing number of users
The computer network in large companies to thousands of people.
At the beginning of the emergence of networks cannot support LAN network needs
Large companies offices spread over vast areas, perhaps on a
Several countries, this had to be the development of a new type of network that joins networks Local in different parts of the country or that the linking local networks in countries Different, and launched on this type of network name Wide Area Network (WAN
Or broadband networks, and using this technique the increasing number of users
The computer network in large companies to thousands of people.
WAN networks are divided into two categories:
1- ENTERPRISE NETWORK
2- GLOBAL NETWORK
The first type is linking local area networks or branches of a company or institution
And one at the level of one country or several countries,
Type II while working on connecting local networks of several different institutions.
Topology Classification by restructuring and planning
All local scale LAN networks based on three basic designs:
* Bus or carrier and is also called the Backbone or spine.
* Star Star.
* Or ring Ring.
(BUS) linear design of the network::
Network design of the type BUS is the simplest and probably most common in local networks,
The design of this network connect computers in a row along a single wire called Segment As shown in the picture, and referred to this type also known as Linear Bus.
1- ENTERPRISE NETWORK
2- GLOBAL NETWORK
The first type is linking local area networks or branches of a company or institution
And one at the level of one country or several countries,
Type II while working on connecting local networks of several different institutions.
Topology Classification by restructuring and planning
All local scale LAN networks based on three basic designs:
* Bus or carrier and is also called the Backbone or spine.
* Star Star.
* Or ring Ring.
(BUS) linear design of the network::
Network design of the type BUS is the simplest and probably most common in local networks,
The design of this network connect computers in a row along a single wire called Segment As shown in the picture, and referred to this type also known as Linear Bus.
The idea of this type of network designs on three things:
(Signal) send the signal
(Signal Bounce) echo signal
(The Terminator) Terminator or position
Send data on the network in the form of electrical signals to each Computers connected to the network, and information is accepted by the computer
Address complies with Title encrypted within the original signal transmitted on the network.
In the design of the network of the type Bus:
If the two computers to send data at the same time there will be a so-called collision or Collision This should be on every computer waiting for his role in sending data on the network, and therefore the greater the number of Devices on the network, the longer the time waiting for him to reach the role each of them to send data, and thus increased slower network.
(Signal) send the signal
(Signal Bounce) echo signal
(The Terminator) Terminator or position
Send data on the network in the form of electrical signals to each Computers connected to the network, and information is accepted by the computer
Address complies with Title encrypted within the original signal transmitted on the network.
In the design of the network of the type Bus:
If the two computers to send data at the same time there will be a so-called collision or Collision This should be on every computer waiting for his role in sending data on the network, and therefore the greater the number of Devices on the network, the longer the time waiting for him to reach the role each of them to send data, and thus increased slower network.
(RING) Category annular network:
Features ring network
* Low cost for a main line and one in the form of a loop
* Unlimited geographical area that each device restores strengthen signal as it passes by.
* Transfer speed information of a very large and determined only type of transport modes and transmitters and receivers.
* Easy to manage with the observation that it must provide additional software for the software used in the linear network.
* Low cost for a main line and one in the form of a loop
* Unlimited geographical area that each device restores strengthen signal as it passes by.
* Transfer speed information of a very large and determined only type of transport modes and transmitters and receivers.
* Easy to manage with the observation that it must provide additional software for the software used in the linear network.
Defects ring network
* Disrupted the network in case of any hardware failure.
* Cannot benefit from the use of phone lines available and related to the department within a single institution.
* Disrupted the network in case of any hardware failure.
* Cannot benefit from the use of phone lines available and related to the department within a single institution.
Stellar classification of network:
Network Features asterisk:
* Disruption does not affect any device in the network to work with the exception of server crashes.
* Easy messaging and updating of information being found in a single device.
* The possibility of using telephone lines related to the department in case of availability of the required specifications.
Defects stellar network:
* Higher costs due to the delivery of each station separately with collection points Hub.
* Disable server disables all networks.
* Easy messaging and updating of information being found in a single device.
* The possibility of using telephone lines related to the department in case of availability of the required specifications.
Defects stellar network:
* Higher costs due to the delivery of each station separately with collection points Hub.
* Disable server disables all networks.
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