Ms. K Scruggs

Given instructions, the learner will demonstrate the use of networking component with 85% accuracy.

What is a computer network? List the four purposes of a network. Explain the elements of communication. List and describe 2 types of networks.

Network and Computer Network Network Defined as anything that resembles a net in how it looks or functions. Computer Network Defined as a multiple computers and devices that are all connected together

The purpose of a computer network is SHARING.

Information Sharing Hardware Sharing Software Sharing Collaborative Environment

Data Communication: Computer Components A sending device - computer A communication device - Modem A communication channel or path – Telephone lines, cable, or a wireless transmission link A receiving device that accepts the incoming signal – Computer Communication software Computer Modem Communication Channel Receiving Device

ServerServer A computer that manages network resources. ClientClient A computer on the network that relies on the server for resources.

Communication ChannelCommunication Channel To transfer data from one computer to another requires some type of link through which the data can be transmitted. Transmission MediaTransmission Media Used to transmit data from one device to another; may be wireless or physical.

Twisted-pair cableTwisted-pair cable The least expensive type of cable and is the same type used for many telephone systems. Coaxial CableCoaxial Cable The primary type of cabling used by the cable television industry and it is also widely used for computer network. It is also the more expensive

Fiber-optic CableFiber-optic Cable is made from thin, flexible glass tubing. –Advantages The bandwidth is much greater, so it can carry more data. It is much lighter than metal wires, and is much less susceptible to interference. –Disadvantage Fiber optics are fragile and expensive

Radio SignalsRadio Signals is a transmission using radio signals require line of sight; that is, the signal travels in a straight line from one source to the other.

A microwave signal is sent through space in the form of electromagnetic waves. Just like radio signals, they must also be sent in straight line from one microwave station to another. To avoid interference, most microwave stations are built on Mountaintops or placed on the top of large building.

Satellite TransmissionSatellite Transmission –Communication satellites are placed in orbit 22,300 ft above the surface of the earth. –This allows the satellite to maintain a constant position above one point on the Earth’s surface by rotating to the same speed as the Earth.

Intermission

Communication Hardware Modem Is an acronym for modulate- demodulate, which means to convert analog signals to digital and vice versa Cable Modem Uses coaxial cable to send and receive data

Network Interface Card (NICs) Hub Bridge Gateway Router

Network Interface Card (NIC)) An add-on card for a computer in a network that enables and controls the sending and receiving of data in a network.

Hub Is a junction where information arrives from connected computers or peripheral devices and is then forward in one or more directions to other computers and devices.

Bridge A special computer that connects one local area network to another Local Area Network. Both networks must use the same protocol, or set of rules.

A combination of software and hardware that links two different types of networks that use different protocols. For instances, gateways between electronic mail systems permit users on different systems to exchange message.

Router A device that directs traffic on a network by dividing data into smaller routes and then are reassembled at their destination. The Traffic Police

Types of Networks Local Area Networks (LANs) A series of connected personal computers, workstations, and other devices. Wide-Area Networks (WANs) Computer networks that cover a large geographical area. AT&T

The Client/Server NetworkThe Client/Server Network A type of network architecture in which one or more computer on the network acts as a server. Peer-to-Peer NetworkPeer-to-Peer Network A type of architecture, all of the computers on a network are equal. There is no computer designated as the server.

IntranetIntranet Designed for the exclusive use of people within an organization. ExtranetExtranet Similar to the intranet, but it allows specified users outside the organization to access internal information system.

Fin!