Week three- Networking

 Today is week 3 of the class and today we learn about networking. ^^

Computer network is:
- A collection of computers and other hardware devices that are   connected together to share hardware, software, and data as well as to communicate with one another.

A basic network connects 2 computer together by a cable to exchange data and information  while a LAN, allows the sharing of data and devices such as modems and printer.

–Types of LAN based on geographic coverage.

•LAN – Local Area Network

•WAN - Wide Area Network

•MAN - Metropolitan Area Network

computer network can be categorized according to three properties:

1. typology
2. protocol
3. architecture  

Network topology is the layout pattern of interconnections of the various elements (links, notes) of a computer network. It is the geometrical arrangement of the network. The picture below show the different arrangement of the network.

 A network protocol defines rules and conventions for communication between network devices. 

The most common network protocols are:

1. Ethernet
2. Local Talk
3. Token Ring
4. FDDI
5. ATM

The follow is some common-used network symbols to draw different kinds of network protocols.

A network architecture is the specification of design principles (including data formats and procedures) for creating a network configuration of data processors. Two most common network are peer- to- peer and server/client network 

server/client 

There are two types of transmission media; bounded and unbounded. 

     • Bounded Media         • Unbounded Media (air or a vacuum)

- Twisted pair wire        - AM and FM radio

- Co-axial cable             - TV broadcasting

- Fiber optic cables        - Satellite communication

- Microwave radio

- Infrared signals 

- Below are some examples of network electronic device and

their properties:

• A network bridge connects multiple network segments.A bridge uses a forwarding database to send frames across network segments.

• A router is a device that forwards data packets between computer networks, creating an overlay internetwork. A router is connected to two or more data lines from different networks.

•  hub is a device for connecting multiple Ethernet devices together and making them act as a single network segment.

• gateway is used to interfaced with other network.A gateway is a network point that acts as an entrance to another network.

As usual, please enjoy the video regarding computer networking: