CIS300 Chapter 6

a family of wireless protocols known as Wi-Fi (Wireless Fidelity)
supports wireless communication within 100 meters of router

connection between wireless device and a wired network

allows Internet access within range of equipment

ability to scramble and encode messages through encryption keys that are shared only between the sender and receiver

allows devices to communicate within 10 meters
transmits voice and data
considered a personal area network (PAN) technology

increases range and speed of wireless communication

works with metropolitan area networks (MANs)

would enable Internet connection while in a moving vehicle

similar to cell phone communications

compatible with IP services, Wi-Fi, and Bluetooth

would support WiFi routers on cell towers to allow use of VoIP by cell phones

speed of receiving from network

speed of transmitting to network

data remains digital through entire transmission

point-to-point dedicated digital circuits provided by telephone companies

a free satellite service that provides location information

point-to-point transmission between two stationary devices, typically between buildings

when the optical fiber reaches the subscriber's living or work space

provides services through optical fiber lines

uses Internet connection to conduct telephone conversations

networks with enhanced services offered by outisde vendors

provide reliability, management, and maintenance of networks for an organization

preferred method of conducting e-commerce

less costly than VANs

wireless network designed for handheld and personal devices

used by one or two people, transmission speed is lower, maximum distance is about 10 meters

connects a device to a hub, switch, bridge, router, which connects to a LAN or WAN

central location to connect devices to LAN

broadcasts all communications to all devices

a hub that sends communications only to designated devices on the network

connects two networks

routes data packets to the next node on the path to the final destination

translates communication signals from analog to digital and vice verse

slower type of connection through modem, usually no faster than 56 Kbps

can be an alternative to creating a LAN

doesn't require leasing of lines

utilizes the Internet, a public network, to stimulate a private network that only authorized users can access

includes intranet and extranet

dedicated channel is established for the furation of the transmission

message broken into packets

group of bits transmitted together

high-speed packet-switching protocol used in WANs

variable-sized packets routed quickly

uses packets, but all packets are routed on the same path

used for VoIP

set of rules governing communication between computers

a set of related records

highest speed channels

a computer connected directly to a backbone

unique numerical identificaton for a network device

associate a character-based name with an IP address

a permanent address assigned to a device

temporary IP address assigned to a device for the duration of the connection

LAN protocol using coaxial or Cat 5 or Cat 6 twisted pair cable

faster Ethernet connection of one Gbps or greater

transmitted images and speech

enables rapid transactions and payments

used to locate and download files from any online computer through the Internet using applications

speed at which data is communicated

also called transmission rate or bit rate

unit of measure for bandwidth

communications medium that can carry onle one transmission at a time

communications medium that can carry multiple transmissions simultaneously

pairs of insulated copper wires twisted together

flexible, reliable, and low cost

connects devices with RJ-45 connector plug

for cable television transmission

used for Internet connections via cable

uses light to represent bits

not susceptible to interference

can carry signals for longer distances

use radio waves to carry bits

high-frequency radio waves that can carry signals with high accuracy over long distances

electrical power grid can be used for telecommunication

telecommunications through power lines

combination of devices (or nodes) connected through a communication media

computer network within a building, or a campus adjacent buildings

established by a single organization and shared among employees

a single computer controls the network

no central device controls communications

advantages of this are easier installation, more scalable, more flexible

drawback is that they are less secure

ease of expanding a system

links multiple LANs within a large city

typically uses fiber optic or wireless broadband connections between LANs

far-reaching system of networks composed of LANs or MANs

may be public or private