Benefits of a Network Allows simultaneous access to

Benefits of a Network: • Allows simultaneous access to critical programs and data. • Allows people to share peripheral devices, such as printers and scanners. • Streamlines personal communication with email. • Makes the backup process easier.

Networking in a word: efficiency SHARED DATA, PROGRAMS AND BACKUPS

Network Setup: • LAN (Local Area Network) • WAN (Wide Area Network) • MAN (Metropolitan Area Network)

Local Area Network LAN • A network of computers located relatively near each other and connected by a cable.

Wide Area Network WAN • Two or more LANs connected together, generally across a wide geographical area using highspeed or dedicated telephone line.

Metropolitan Area Network MAN • Similar to a WAN network but is confined to a single city or metropolitan area.

Node - individual computers attached to a network.

Network Types: • Server Network • Peer-to-Peer Network

Server Network: • File Server – used to store and forward (send) files from and to computers (nodes) on the network. • Client/Server – individual computers (nodes) share the processing and storage workload with a central server.

Peer-to-Peer Network: • Simple Peer-to-Peer – all nodes on the network have equal relationship to all others, and all have similar types of software. • Distributed Computing – enables users to draw on the processing power of other computers in the network.

Topology - the physical layout of the cables that connect the nodes of the network.

Network Topologies: • Bus topology • Star topology • Ring topology

Bus topology - a single conduit to which all the network nodes and peripheral devices are attatched.

Bus: a single path connects all devices. BUS A broken path can bring down all connected devices.

Star topology - places a hub in the center of the network nodes. Groups of data are routed through the central hub to their destinations.

Star: the hub is in the center of the network nodes. The entire network goes down only if the hub is lost.

Ring topology - connects the nodes of the network in a circular chain in which each node is connected to the next.

Ring: each node is chained to the next. If a connection is lost, the entire network goes down.

Network Media - refers to the wires, cables, and other means by which data travels from its source to its destination.

Network Media: • Twisted-pair wire • Coaxial cable • Fiber-optic cable • Wireless links

Network Protocol - a set of standards for communication. • TCP/IP • IPX/SPX • Net. BEUI

Network Operating System (NOS) - the group of programs that manages the resources on the network.

Creation of the Internet: The Internet came about through a combination of ARPANET, NSFnet (National Science Foundation), and other networks.

TCP/IP (Transmission Control Protocol/Internet Protocol) - the protocol used to connect computers with the Internet.

Transmission Control Protocol/Internet Protocol

Domain Name System (DNS) - an address that uses words rather than numbers. Made up of two parts: • An individual name (created for the individual user) • Domain (a name for a computer connected to the Internet)

Internet Domains: . com. edu. gov. mil. net. org business (commercial) educational government military gateway or host other organization

Features of the Internet: • E-Mail • Chat • News • World Wide Web • Telnet • Online Services • FTP • Entertainment • Gopher • Bulletin Boards

Modem - (short for modulatordemodulator). Used to translate digital signals into analog signals that can travel over standard phone lines.

參考網站 • • • http: //netcity 4. web. hinet. net/userdata/dinjia/new_page_23. htm http: //wcis. erl. itri. org. tw/publish/waterpbrs/sen_pub/Volume 17/p 12. htm http: //content. edu. tw/senior/computer/ks_ks/book/other/history. htm Wired news http: //tw. wired. lycosasia. com/ SETI@home http: //setiathome. ssl. berkeley. edu/index. html SETI@Taiwan 台灣團隊 http: //setitaiwan. tripod. com/index. htm 電機修護班 http: //210. 59. 145. 203/crcew/mainindex. htm United Devices http: //members. ud. com/home. htm 台大不良牛牧場 bbs: //zoo. twbbs. org