OBJECTIVES: - •Discuss the purpose of the components required for successful communications and identify various sending and receiving devices •Describe the uses of computer communications •List advantages of using a network, and differentiate among LANs, MANs, and WANs •Differentiate between client/server and peer-to-peer networks, and describe how a P2P network works •Differentiate among a star network, bus network, and ring network •Describe the various network communications standards •Explain the purpose of communications software •Describe various types of lines for communications over the telephone network •Describe commonly used communications devices •Discuss different ways to set up a home network •Describe various physical and wireless transmission media COMMUNICATION -A process in which two or more computers or devices transfer data, instructions, and information Sending devices -> Communication channel -> Receiving device Uses of computer communications -Blogs,chatroom, email, fax, FTP, Instant messaging, internet, newsgroup, RSS, Video conferencing,VoIP, Web, Web 2.0, web folders, and Wikis Network- A collection of computers devices connected together via communications and transmission of data Advantages of using network: -
Local Area Network (LAN) - Limited internet in certain geographical area Wireless LAN (WLAN)- Connections that does not use physical cable Metropolitan Area Network (MAN) - Connects LAN in a metropolitan area Wide Area Network (WAN) - Networks that covers large geographical area Client/Server network- A powerful computers (server) is a hub to which computers and workstation (client) connected together Peer-to-Peer network- Internet network on which users access each other’s hard disks and exchange files directly over the Internet Network topology Star Network- A Local Area Network (LAN) which devices is connected directly to a central computer Bus Network- A LAN which each of the devices are connected to a single network cable Ring Network- Connects to exactly two other nodes, forming a single continuous pathway for signals through each node Network Communications Standard - Ethernet= A network standard that specifies no computer controls when data can be transmitted -Token ring= Standard specifies that computers and devices on the network share or pass a special signal -TCP/IP=a network standard that defines how messages are routed from one end of a network to another -Wifi= network based on the 802.11 standard that facilitates wireless communication -Bluetooth= Uses short ranges radio waves to transmit data -UWB (Ultra WideBand) = two UWB devices use short-range radio waves to communicate at high speeds -IrDA= Uses infrared to transmit data -RFID= uses radio signals to communicate with a tag placed in or attached to an object, animal, or person -WiMAX= Provides wireless broadband Internet access -WAP= Uses a client/server network Communications Software:- -Help users establish a connection to another computer or network -Manage transmission of data and info -Provide an interface for users to communicate with one another Type of line:-
Communication Devices: Wireless modem, Network card, Wireless access point Physical Transmission Data:-
-Twisted-pair cable -Fiber-optic cable -Coaxial cable Wireless Transmission Data:- -Infrared -Broadcast Radio -Cellular radio -Microwave radio -Communication satellite
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