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Sunday, April 14, 2013
فيديو كيفية عمل الارتباطات التشعبية في power point2007
من خلال الفيديو يوضح خطوات عمل الارتباطات التشعبية في برنامج
power point 2007
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فيديو تعلم كيفية إدراج الافلام والصور في pwerpoint2007
كيفية ادراج الصور والافلام في برنامج
power point2007
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Wednesday, April 10, 2013
Computer Networks
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.
Oracle software
oracle
This simplified information about Oracle program of interest:
Oracle program is the strongest program - at all - to create a completely secure databases And is used to establish financial accounts or tables or database of companies or institutions or Web sites on the Internet in addition to the possibility of linking some maids with strong control over confidentiality and the possibility of updating as the chosen time.
Oracle program is the strongest program - at all - to create a completely secure databases And is used to establish financial accounts or tables or database of companies or institutions or Web sites on the Internet in addition to the possibility of linking some maids with strong control over confidentiality and the possibility of updating as the chosen time.
There are programs to create databases (Database) multiple of the most famous:
1 - Dbase3
2-Foxpro
3 - ALIPARD
4-Access
5 - Power bilder
6 – ORACALE
1 - Dbase3
2-Foxpro
3 - ALIPARD
4-Access
5 - Power bilder
6 – ORACALE
*And the advantages of the Oracle (ORACLE) for the rest of the database programs include:
1 - prerogative secrecy where it is difficult to get data from tables only by entering
To the same program
2 - its huge potential for backup and repair data
3 - high abilities in dealing with networks and to define the powers of each user to isolate work from other or incorporated by choice strongly and ensure
4 – High secure in dealing with Web pages and view reports through personal page, for example, can be
The head of a company or Powered to review the data his company on web pages safely with difficulty
Impenetrable - and imposing impenetrable difficult - if not impossible - access to the database as well as being able to change it.
5 - with the power of the secretariat find most Web sites with the severity of its complexity it needs to be a programmer to create a professional
SAFE database,
6- program any are dealing directly with the data unlike (ORACLE), you can not access the data, but by entering the program from within screens every entry required user name and password or put groups as one word.
7 - Who can deal with this program efficiently is a professional and skillful like tempting salaries and companies always prefer a professional programmer.
8 - Oracle (ORACLE) comes in several versions, including personal PERSONAL networks Network.
7 - Who can deal with this program efficiently is a professional and skillful like tempting salaries and companies always prefer a professional programmer.
8 - Oracle (ORACLE) comes in several versions, including personal PERSONAL networks Network.
Here is information on Oracle Applications
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