the transmittal of data and information from one point to another.
transmitted images and speech
enables rapid transactions and payments
Peer-to-Peer File Sharing
used to locate and download files from any online computer through internet using applications, usually in violation of copyright laws
Web Empowered Commerce
Increasingly fast communications allows organizations and individuals to conduct business, research, market, educate and train, shop, purchase and pay.
speed at which data is communicated.
Synonym for Bandwidth
Transmission rate or bit rate
communications medium that can carry multiple transmissions simultaneously
Tangible Communications Media
Twisted Pair Cable, Coaxial Cable, Optical Fiber, Electrical Power Lines
Intangible Media Communications
microwaves, radio frequencies,
Twisted Pair Cable
pair of insulated copper wires twisted together, twisting reduces EMI. 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 EMI but is susceptible to RMI. Can carry signals for longer distances.
Radio Frequency Technologies
uses radio waves to carry bits. ie. WiFi, Bluetooth
High-frequency radio waves that can carry signals with high accuracy over long distances. For outside transmission, weather conditions may degrade quality. Can be transmittied by satellite links.
can be used for telecommunication
Availability, Bandwidth, Vulnerability
What to consider when choosing a network
a combination of devices (or nodes) connected through a communication media
established by a single organization and shared among employees.
Server Based LAN
a single computer controls the network
no dcentral device controls communications
offer advantages: easier installation, scalability, flexible. Drawbacks: less secure
Links multiple LAN's 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
networks with enhanced services offered by outside vendors. Provides reliability, management, and maintenance of networks for an organizationn
dedicated channel (circuit) is established for the duration of the transmission
message broken into groups of bits transmitted together. Transmitted independently, and may be routed through different paths
high-speed packet switching used in WANs
Multi Protocol Label Switching
uses packets, but all packets are routedon the same path; used for VoIP
Set of rules for governing communication between computers. Most important being the TCP/IP.
a set of related protocols that ensures packets arrive accurately and in proper order and ensures efficient delivery of packets from node to node.
highest speed channels
a computer connected directly to a backbone
unique numerical identification for a network device
Domain Name Service
associates a character based name with an IP address
Statis IP Address
a permanent address assigned to a device
Dynamic IP Address
temporary IP number assigned to a device for the duration of the connection.
LAN protocol using coaxial or Cat 5 or 6 twisted pair cable
faster Ethernet connection of one Gbps or greater
protocol that ensures there are no collisions in transmission
a family of wireless protocols
Access Point (hotspot)
connection between a wireless device and a wired network
ability to scramble and encode messages.
allows devices to communicate within 10 meters. Tramsmits voice and data and is considered a PAN technology.
increase range and speed of wireless communication.
Mobile Broadband Wireless Networks (MBWA)
similair to cell phone communications. Compatible with IP services, WiFi, and Bluetooth.
speed of receiving from network
speed of transmitting to network
data remains digital through entire transmission. Uses telephone lines.
T1 & t3 Lines
point-to-point dedicated digital circuits provided by telephone companies
Fiber to the Home
when the optical fiber reaches the subscribers living or work space.
provides services through optical fiber lines. Expensive but very high connection speeds
uses electric power lines to carry digital signals
uses internet connection to conduct telephone conversations.