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CIS: CH 6
Terms in this set (46)
a project designed for communications of valuable computer resources between various universities in the U.S and Stanford Research Institute. The project was handed to the National Science Foundation for further development.
a network of high capacity routers and fiber optic communications links that provide the main routes for data traffic across the internet.
network service providers
the parties that maintain backbone links and routers. equipment and links are tied together by network access points
internet service provider
a company that offers internet access to individuals, businesses, and smaller ISPs.
a device used for a computer to communicate with an ISP. converts data carrying signals from a computer to signals that can travel over various communications channels.
transmission control protocol (TCP)
creates connections and exchanges packets of data
hypertext transfer protocol (HTTP)
exchanges information over the web
file transfer protocol (FTP)
transfers files between local and remote host computers
post office protocol (POP)
transfers mail from an e-mail server to a client inbox
simple mail transfer protocol (SMTP)
transfers e-mail messages from client computers to an e-mail server
voice over internet protocol (VoIP)
transmits voice conversations in real time between online users
internet relay chat (IRC)
transmits text messages in real time between online users
a combination of protocols that work together
primary protocol suite for transmitting messages on the internet. one half breaks a message or file into packets, while the other half addressing packets so they can be routed to their destination.
static ip address
a permanently assigned ip address to a computer
easy to understand alphabetized version of a server address.
dynamic ip address
a temporary assigned ip address to a computer
domain name system
the database that translates domain names to ip addresses and holds every domain name which corresponds to a unique IP address
domain name server
a computer that hosts the database (domain name system) of storing ip addresses
dns cache poisoning
dns malfunctions (or is hacked) allowing internet users to be directed to the wrong website
the elapsed time it takes for data to make a round trip from point A to point B, then back to point A. averages less than 100 milliseconds in north america.
ping (packet internet groper)
sends a signal to a specific internet address and waits for a reply. upon reply, a report is made that the computer is online and displays the elapsed time for the round trip message.
records a packet's path in addition to its round-trip speed. can use this utility to analyze the latency of data as it hops from one internet router to the next.
the rate of data that is uploaded from your computer to the internet. usually slower than downstream speed.
the rate of data downloaded to your computer.
asymmetric internet connection
when upstream speeds differ from downstream speeds. for most users, this type of connection is sufficient.
symmetric internet connection
when upstream and downstream speeds are the same. useful for servers.
fixed internet access
links a computer to an ISP from a stationary point: a wall socket, roof mounted antenna.
portable internet access
easily move an access device, like vehicle mounted satellite dishes that can be deployed when the vehicle is parked.
mobile internet access
allows the user to use internet on the go, such as a cell phone to collect email.
fixed internet connection that uses voiceband modem and telephone lines to transport data between a computer and an isp. computer's modem makes a regular telephone call to an isp, upon the isp answering, a dedicated circuit is established between the computer and the isp. the circuit remains connected for the duration of the call and provides a communications link that carries data between the computer and the isp.
converts the digital signals (that represent data bits in a computer into audible analog signals that travel over telephone lines. speed measured in bits per second
digital subscriber line
high speed, digital, always on internet access that runs over standard phone lines. data is directly transmitted to and from local telephone switching stations into digital form. can simultaneously carry voice and data. speed caries according to distance data is traveling and measured in mbps
a device that connects a computer to a telephone line and converts computer data signals into signals compatible with dsl. data doesn't need to be changed into analog signals, since its already digital.
prevents voiceband signals from interfering with dsl signals. connects to lines used for handsets, answering machines, and similar devices.
cable internet service
a means of distributing always-on broadband internet access over the same infrastructure that offers cable television service. has enough bandwidth to support tv channels and data flowing down and upstream. most of this type of internet service is asymmetric, with upload speeds slower than download speeds.
a device that converts a computer's signal into one that can travel over the community antenna television network. most have usb and ethernet ports
data over cable service interface specification
data transport technology that includes security filters. used by cable companies to block crossover traffic between subscribers
satellite internet service
means of distributing always on high speed asymmetric internet access by broadcasting signals to and from a high personal satellite dish.
a device that modulates the data signals from a computer into a frequency band that can be carried to the satellite dish, where it is converted to another frequency, amplified, and transmitted. connects with two coaxial cables, one to transmit one to receive.
fixed internet service
offer internet access to homes and businesses by broadcasting data signals over areas large enough to cover most cities and outlying areas. are usually MAN standards.
an ethernet compatible network. offers an alternative to wired technologies. transmits data to and from antennas mounted on towers. a single tower can serve a large geographical area. can also transmit data to to other towers using microwave links and connect to the internet via cable.
grid computing system
a network of computers harnessed together to perform processing tasks. can be public or private
file transfer protocol
provides a way to transfer files from one computer to another over any tcp/ip network, such as a LAN or the Internet.
p2p file sharing
allows users to obtain files from other users located anywhere on the internet
a file sharing protocol that distributes the role of a file server across a collection of dispersed computers. adhoc collection of personal computers located anywhere on the internet. computers request a file which breaks into pieces and become part of a swarm. server downloads all file pieces to the swarm which are exchanged until the full file is downloaded onto each computer
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