My comment on some technology lecture

on sunday 3/7/2011

lecture title, instruction software evaluation

المحاضرة كانت عادية 

on monday and tuesday  4/7/2011

lecture title,  introduction of computer 

المحاضرة كانت وايد ممتعة ويوجد معلومات قيمة

on wednesday 6/7/2011

lecture title, internet for teaching learing 

المحاضرة كانت رائعة

on sunday 10/7/2011

lecture title, computer security 

  المحضرة كانت ممتعة ومشوقة 

مرحبا بكم في مدونتــــــــي

Different types of Networks

  

Different types of networks

Different types of (private) networks are distinguished based on their size (in terms of the number of machines), their data transfer speed, and their reach. Private networks are networks that belong to a single organisation. There are usually said to be three categories of networks

• LAN (local area network)
• MAN (metropolitan area network)
• WAN (wide area network)

There are two other types of networks: TANs (Tiny Area Network), which are the same as LANs but smaller (2 to 3 machines), and CANs (Campus Area Networks), which are the same as MANs (with bandwidth limited between each of the network's LANs

LAN

LAN stands for Local Area Network. It's a group of computers which all belong to the same organisation, and which are linked within a small geographic area using a network, and often the same technology (the most widespread being Ethernet).

A local area network is a network in its simplest form. Data transfer speeds over a local area network can reach up to 10 Mbps (such as for an Ethernet network) and 1 Gbps (as with FDDI or Gigabit Ethernet). A local area network can reach as many as 100, or even 1000, users.

By expanding the definition of a LAN to the services that it provides, two different operating modes can be defined

In a "peer-to-peer" network, in which communication is carried out from one computer to another, without a central computer, and where each computer has the same role

in a "client/server" environment, in which a central computer provides network services to users

MANs

MANs (Metropolitan Area Networks) connect multiple geographically nearby LANs to one another (over an area of up to a few dozen kilometres) at high speeds. Thus, a MAN lets two remote nodes communicate as if they were part of the same local area network.

A MAN is made from switches or routers connected to one another with high-speed links (usually fibre optic cables)

WANs

A WAN (Wide Area Network or extended network) connects multiple LANs to one another over great geographic distances.

The speed available on a WAN varies depending on the cost of the connections (which increases with distance) and may be low.

WANs operate using routers, which can "choose" the most appropriate path for data to take to reach a network node

The most well-known WAN is the Internet

http://www.youtube.com/watch?v=Z8sqPruWG6Y&playnext=1&list=PL5FE79D41DDA99EB7 

Interent in teaching and learning process

http://www.youtube.com/watch?v=R8VfChM5EhA

 Internet is important way to provide learning and teaching process. It is networks of networks of millions of computers that share information with each other by using (TCP/IP). It has a lot of information that anyone in the world can access on different topics contributed by people. Internet gives student many benefits. For example, the student can discover the world by using internet and learn more about culture of many countries. Also, the student can solve your problems from it’s through explore, make mistakes and correct their error. They share with your teacher to be more interactive in lectures. So, the student can cooperate with teacher and with other students. There are three delivery modes such as classroom instruction (face to face), Asynchronous (e-mail, listservs, and discussion boards), Synchronous (video conferencing, Teacher and student separated by distance, not necessarily long).There are a lot of Internet uses such as research, blog, Email, Presentation tool, collaboration, online school, social networking, streaming video, lesson plan, and searching. All of these uses is important to student and teacher to research information, express their idea and thought, to send message and working with classmate, getting higher educating, or share interest and activity, and allow teacher to post lesson or presentation in websites to help student. The Internet will be more effective when it is encourage contact between student and teacher, use active learning techniques, develop cooperative among students, give promotes feedback, emphasis time on task, communication high exceptions, and respect diverse talent. Finally, we can’t life without internet because many reasons. It change our life to the best.