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A+ Flash Cards
Flash cards for A+ Exam
13
Computer Science
12th Grade
12/05/2012

Additional Computer Science Flashcards

 


 

Cards

Term
Plenum vs. PVC
Definition
PVC is used as a seath for most cables, but cables in the spaces between floors of buildings (these spaces are called plenums) should be coated in Teflon because PVC gives off toxic fumes when burned. Otherwise, cable performance is the same.
Term
UTP Cable
Definition
(Unshielded twisted pair) most common and least expensive ethernet cables, but vulnerable to electromagnetic interference
Term
STP Cable
Definition
(Shielded twisted pair) same construction as UTP, but with added covering around wires to protect from electromagnetic interference. More expensive than UTP cable
Term
Fiber Optic Cable
Definition
cable that uses glass fibers to transmit pulses of light. Very fast, but cable is fragile
Term
Coaxial Cable
Definition
first type of networking cable, now only used for cable TV. Replaced by ethernet because coax requirese a bus topology and cannot be used with a hub or switch
Term
RJ-45 Connector
Definition
used for UTP and STP ethernet cables
Term
RJ-11 Connector
Definition
used for telephone connections, dial-up modems and DSL
Term
Broadband
Definition
general term for high-speed internet, 300 kbps and faster. Different from dial-up in that it can be used simultaneously with phone service
Term
DSL
Definition
(Digital subscriber line) uses the telephone line to deliver internet. DSL modem connects computer to service, typically through ethernet port
Term
Cable Internet
Definition
delivered through the same coax cable that provides cable TV signal
Term
Satellite Internet
Definition
uses a satellite dish to send and recieve signals between geosynchronous satellites. FCC requires professional installation of satellites; an incorrectly aligned dish with uplink capabilities can interfere with satellites and disrupt service
Term
Fiber Internet
Definition
point-to-point connection with ISP is estabished with a fiber optic cable to deliver internet to business or residence
Term
Dial Up
Definition
oldest technology for home users to connect to the internet, uses an analog modem to connect to an ISP over phone lines
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