Fichas
Flashcard key terms
Fichas del conjunto (82)
- 1client slideuser on any device with a internet connection
- 2search enginesoftware which is used to access with web
- 3server sidewhere web sites are stored.
- 4spider/web crawlerthey look around the web, looking for new or updated page and log them in the search engine's data base.
- 5indexsearch engine's data base
- 6data baseA place where all the web pages go.
- 7sponsored link resultlinks that are paid to be showed the most.
- 8Advertspromotional content
- 9popularitythe most popular sites will be shown at the very top.
- 10search engine diagram
- 11—Data Exchange.
this is what a packet of data look like.
- 12—codec converter
- 13Packet switchingthe process of data being broken into 'packets' before being sent through a network and then re-assembled at the other end
- 14adv packet switchingpackets chose different routes so traffic flow is efficient.
big file can still be sent but don't clog network.
packet give security benefits - 15disadv of packet switchingif one or more packets are lost or corrupted during transmission, the whole file will not be received correctly.
- 16Simplexsignals go in one direction at a time
- 17simplex exampleA TV remote send a signal but it doesn't receive one back.
- 18duplexsignals go in both direction at the same time
- 19Duplex exampleyou can speak on the phone with some one at the same time.
- 20half duplexsignals go in both direction but not simultaneous.
- 21half duplex examplecan send and receive signals but not at the same time.
- 22serialBits of data are transferred one at a time over a wire
- 23parallelBits of data are transferred simultaneously
- 24serial benefitsgood over large distances
- 25serial limitationcomplex because data has to be broken into individual bits.
- 26parallel limitationonly for short distance eg 5 meters
- 27parallel benefitsfaster because more bits transferred per second
- 28UTPUnshielded twisted pair is cable made up of pairs of copper wires twisted together.
- 29STPshielded twisted pair is like UTP but shielded. the shielding protects the cable from interfering.
- 30UTP/STP BENEFITSinference is lessened due to the twisting.
cheaper than others methods.
reliable. - 31UTP/STP draw backslow. low capacity. used over short distances. susceptible to noise, which mean the data can be interfered with is near another digital device or signal.
- 32co-axial cableis a solid copper wire with thick shielding. used to connect TV with aerial.
- 33co-axial cable benefitsReliable.
- 34co-axial cable drawbackSlow, low capacity, used over short distances, thick and physically inflexible, susceptible to noise.
- 35fibre optic cable FOCGlass or plastic cable which use light to transmit data.
- 36benefit FOCfast, used over long distances, little interference.
- 37Draw backs FOCExpensive, Complex to install(needs a specialist)
- 38infrareduses infrared light to transfer data.
- 39infrared benefitsreliable
- 40infrared draw backshort range, device must be in line of sight, can suffer from interference.
- 41microwavesuses short wave lengths to transmit data example, blue tooth
- 42microwaves benefitsgood for longer distances.
- 43microwaves DrawbackCan suffer from interference from other devices.
- 44satelliteuses satellites in space to rely data between different points on Earth.
- 45satellite benefitsgood for very long distances.
- 46satellite drawbackvery expensive.
- 47network interface card NICits the hardware for receiving wireless signals.
- 48network access point NAPits sends wireless signals to the NIC.
- 49HTMLHypertext markup language.
HTML is made up of tags, mostly in pairs. pair of tags are called HTML elements. the open tag is written between <>
most tags also have a close tag which include a forward slash text - 50http://www.thuto.org/ubh/web/html/tags1.htmcode for links to websites. the "a" stand for anchor.
- 51—Client server processing
- 52—Server side processing
- 53Client server processing advantagesthe speed, the security.
- 54Client side processing disadvantagesBrowser-specific, computer speed.
- 55Server side processing advantagesserver are powerful computers, no browser involved, efficient.
- 56Server side processing disadvantagesthe security, overloading.
- 57Client side processingviewing a webpages on client device
- 58Server side processingprocessing data at the 'back end' of the website.
- 59Client side processing exampleon a web-pages, images change when your mouse pointer over them.
- 60server side processing exampleAfter you click your data is sent back to the web server for processing, such as storing your personal details on the website's database.
- 61Data Base relationships
- 62data baseis a structured collection of data
- 63tablestores a set of data e.g. detail of all the student in school.
- 64recordone row that store data about a single item eg. a student's details.
- 65fieldthe columns in a table
- 66the primary keya special field with a unique identifier.
- 67foreign keylinks to the supplier table.
- 68relationshipe
- 69textany kind of character, including leters and numbers
- 70numbernumerical value
- 71date/timedata and times
- 72BooleanOne of two values, such as yes/No or true/false
- 73data protection protocol act 1998provides 8 principles that govern the way data about individuals is stored and used.
- 74computers misuse act 1990introduced to protect from hackers and malicious use of viruses
- 75copyright, design and patents act 1988protect creator of original work
- 76freedom of information act 2000provide individual the right to see information stored about them. data also be accessed about public bodies.
- 77Technology used for monitoringCCTV
GPS device
airports passenger list. - 78Communication:monitoring email.
monitoring web site visited.
Logging keywords typed into search engines. - 79pay-per-click:the advertisers get payed every time the client clicks on the page.
- 80fire wall.software that monitor data coming in and out of the internet to protect it from viruses, malware and hackers.
- 81password.a system checks a password has been entered correctly through verification.
- 82version 8 question 18firstly, using broadband is faster than using dial up. this allow the client to use the internet in work.
secondly, the price of broadband is cheaper than dial up. This is
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- Fichas sobre Flashcard key terms, creado por Aneirin Everson el 08/01/2019.
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- Aneirin Everson
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