Karteikarten
Unit 1 revison flash cards
Karten in diesem Stapel (110)
- 1CommunicationServices that let people keep in touch.
That means moving data in form of text, photos, videos and audience. - 2Real Time ServicesServices that provide up to date info.
They are constantly updated for people who need the latest information. - 3Commercebusiness: so these services means money in some way.
eg online shopping and banking. - 4GovernmentThese involve official public services
eg local councils and national government collecting taxes. - 5EducationInvolves workplace training for business as well as learning for schools.
- 6EntertainmentMeans services for leisure and fun.
- 7BusinessMean companies using websites to increase efficiency and save money.
- 8Download servicesThis means legal download for services like music, photos or games.
- 9VLE'sServices that provide virtual classrooms for students and teachers.
- 10Payperclick (affiliate model)A host website displays an ad for another company.
- 11Four types of online advertisingSearching on google and the top link is an ad.
Ads can come as a banner on a website for people to click on.
Watching a video and a ad pops up.
Spam email can get you to click on there links and its free for them. - 12Why companies advertise online (Benefits)They advertise online because everyone goes online with there phone, tablet or computer and there most likely to click on a ad because they are always colourful or look good.
- 13Online communitiesA network group of of people who have the same interests .
- 14Network of friendsA group of friends with a shared interest online.
- 15Virtual WorldThese are things that only exist online. for example Moshi monsters
- 16BlogAn online journal. Often updated to show a persons interests.
- 17MicroBlogA website or app where short messages are exchanged. Example: Twitter.
- 18Chatrooma place on the web where many users are online at the same time can communicate 'Live'.
- 19WikiSites where authorized users can logon to add or edit content.
- 20PodcastAudio or video files that are usually published in installments.
- 21Instant MessagingForm of 'chat' where people are online at the same time and post messages in 'real time' (Live)
- 22ProfileA short paragraph giving a description of a person or organisation
- 23AvatarAn avatar is a picture of something on there profile.
- 24VoIPis the transmission of voice and multimedia content over Internet Protocol (IP) networks.
- 25Advantages of VoIPUses Internet so no additional costs.
Able to connect anywhere as long as you have Wi-Fi.
Reduces travel costs, such as staff in different countries having a 'video conferencing' not flying.
Better collaboration since can also show documents on-screen. - 26Disadvantages of VoIPRelies on internet connection so it can be slow and buffer or it can cut out.
Data exchange online is at risk of security threats, such as hackers, which is especially relevant to a business working with confidential information.
Voice quality can be affected since the audio is being converted to digital and then transmitted over the internet. - 27Equipment required for VoIPWebcam
Mic
Speakers
Headset - 28Ubiquitous ComputingUbiquitous computing is where processors are built into everyday items that are connected online.
E.g. Fridge to shop online, TV to watch films - 29RFID chipsRadio frequency identification chips (RFID) are a way to embed processors into everyday objects.
E.g. animals to track them, same with cars - 30Cloud computingWhen you use external servers instead of your hard drive.
- 31Benefits of cloud computingWith cloud computing you can access any video/photo/document anywhere at anytime.
You only pay for the storage you use, rather than having to buy and maintain all the server hardware. - 32Drawbacks of cloud computingYou have to trust the hosting company to keep your files safe from hackers.
A poor hosting service can mean the servers are slow, or they crash and servers goes down. - 33Standalone software advantages.Is installed your computer, from a CD or download.
Advantages: Its on your hard drive so it doesn't need internet and runs fast. - 34DisadvantagesYou have to pay full price for the software you use..
There are no automatic updates.
You have to keep on saving every 10 minutes because it doesn't save automatically. - 35Online softwareIs accessed over the media((Via web browser). Advantage: You can access software on all devices.
- 36Advantages of online software.Back up and restore online software automatically.
You can pay monthly so you don't have to pay a big amount of cash. - 37DisadvantagesIf your software servers go down you can't access it.
You have to trust the website/company to keep your stuff safe from hackers. - 38Backup and restoreHaving a backup online means a copy of your files are stored on web servers, so you can restore the files if there's a problem.
- 39File compressionCompressing files so they use up less storage space and send files faster. File compression happens using algorithm. Files are zipped afterwards and afterwards they are unzipped or extracted.
- 40Role of indexIndex is created to use store the position of words that were previously deleted from the algorithm. When the files are extracted the index can be used to put the original text together.
- 41AlgorithmEach compression tool has an algorithm. An algorithm is a method to reduce data. One method is to cut out all repeated words and replace them with an index.
- 42Benefits of file compressionFaster to send files
If you need to send lots of emails you can just send one compressed file.
Less storage space. - 43Advantages of collaborative workingStaff can collaborate online and anywhere at anytime.
You only need one document where everyone can edit it.
Don't need to travel so it reduces costs and saves the environment. - 44Version controlWhen lots of people can edit a document, it is vital to show which is the latest version e.g. files names can use numbers or dates.
- 45Levels of accessRestrictions are set at login. Staff can access areas on their roles. Students and teachers see different parts of network.
- 46File permissionFull control - Can do anything to the document even deleting.
Can edit.
Can comment.
Can view. - 47ServerRun special servers to serve other computers. Different types to include files. Print, web and email servers.
- 48ClientA computer/device that uses services provided by a server. The computer you use to access the internet is a client.
- 49RouterDevices that routes (direct) data traffic through a network. They are intelligent and will try to find the best route.
- 50BackboneA 'big' cable (often fibre optic) that connects a large number of devices in the 'core' of the internet.
- 51Network diagram
- 52Network diagram (stages of connecting to the internet)
- 53ISPAn ISP allows connection to the internet. E.g. BT, Virgin
- 54Point of presenceThis is an access point to the internet. An ISP might have several PoPs to allow good access to the internet.
- 55Network access pointThis is where different networks interconnect, such as your home network onto the internet.
- 56Dial up connections AdvantagesCan use existing telephone wires.
Gives connection where broadband is not available. - 57Dial up connections DisadvantagesOld technology and can give poor reception.
Usually slower than other methods.
Conversion between digital and analogue can cause errors. - 58Broadband AdvantagesBetter reception and speed then dial up
- 59Broadband disadvantagesWired, so has to be used on a stationary computer.
Broadband is not available in many rural areas. - 60Wireless (wifi) AdvantagesNot fixed to a stationary computer.
Can be used whenever wireless internet is available (e.g. wifi hotspot) - 61Wireless (wifi) DisadvantagesNeeds to have wireless internet available.
Can be less secured than wired.
Tends to be slower then wired. - 62Download Speeds
- 63BandwidthBandwidth is how much capacity (speed) there is to carry digital data as 1s and 0s.
- 64HTTPHyper text transfer protocol.
HTTP is the set of rules that handle what we do on the web. It handles your REQUEST to load a page from a web server.
It also handles the RESPONSE to download the web page and all its files to your computer. - 65HTTPSThe 's' in HTTPS means secure. data in the webpage is scrambled before sending across the internet.
So if data is intercepted, it can't be understood.
Protects privacy from 'hackers' - 66FTPFile transfer protocol.
An old protocol that was invented even before the web was born.
It is still used to upload and download files from a server.
It is often used by web developers to transfer files to their web server.
But to use FTP you usually need a username and password. - 67TCPTransmission control protocol.
It breaks data into packets and assembles the packets again when they arrive. - 68IPInternet protocol
Its responsible for handling the routing of packets. That's addressing , sending and receiving packets over the net. - 69Network interfaceHardware for receiving wireless thats built into today computers
- 70Hyperlink diagram
- 71HyperlinkThe web works because of hyperlinks.
They connect web pages together.
When a hyperlink is clicked, a user is taken to another page on the site, or taken to another website. - 72BrowserWeb pages are accessed through web browsers. These are applications which allow a user to enter a URL and view a web page.
Your browser reads the HTML code and displays the image. - 73Web serversWebsites are stored on web servers.
When you access a web page through a browser, the page is temporarily downloaded onto your computer.
It is the web servers job to deliver the web page requested. - 74URL diagram
- 75Client side processingClient side is viewing web pages on your client device.
Today's web pages have lots of features that are interactive.
Interactivity is achieved using client scripts written in a language called java script. - 76Server side processingServer side means processing data at the 'back end' on the web page.
That's all the nerdy work that ordinary people never think about.
It's done using special server scripts written in server side languages such as PHP.
All this usually happens after you've done something on a web page. - 77Client side advantagesSpeed - Processing is faster on the client because data does not have to travel back to the server across the internet.
Security - Data cannot be intercepted on the client in the same way it can be when data is transmitted back to the server across the internet. - 78Client side disadvantagesBrowser specific - Different browsers process client scripts in different ways, therefore a web developer cannot be sure how their website will appear on a screen on the client side.
Computer speed - The web developer is relying on the speed of the client computer so if that is slow then the processing will be slow. - 79Server side advantagesServers are powerful computers - A web server is likely to be way more powerful than a client computer, so it can process data faster. No browser involved - Servers don't use browsers so there are none of the difficulties you get on the client with different brands.
Efficient - Everything is done on the server, so no need to wait for downloads. - 80Server side disadvantagesSecurity - When data is sent back from the client, it has to travel across the internet where there is more risk of security threats.
Overloading - If a lot of users are asking the web server to process data, it could overload the server and cause it to crash (eg when thousands of people try to buy gig tickets). - 81DatabaseA database is a structured collection of data.
- 82TableA table stores a set of data e.g. details of all students in school.
- 83FieldA field are the columns in a table eg forename, surename, gender, date or birth.
- 84RecordA record is one row that stores data about a single item eg students details.
- 85Primary keyThe primary key is a special field with a unique identifier eg a student ID
- 86Foreign keyThis supplierID is not really product data so its called a foreign key, its purpose is to link the suppliers table.
- 87RelationshipMost databases need more than one tables to store all the data.
SO the tables need to be linked to create a relational database. - 88Data types and uses: TextAny kind of characters, including letters and numbers.
- 89NumericNumbers
- 90Date/timeDate and times
- 91BooleanOne of two values, such as yes/no or true/false.
- 92DataBase Table
- 93DMBSA DMBS is software that allows you to create and use your own database.
It creates tables and fields and allows you to search and sort data.
It handles security to prevent UN-authorized access.
It can also allow for different levels of access for different users. - 94SQLSQL is the language used by a DMBS to actually create and search a database.
It has a data Definition language (DDL) to set-up the tables.
And it has a data manipulation language (DML) for updates and search queries. - 95Online databaseMeans a database that could be accessed around the world.
- 96Local databaseMeans a database held inside a network to keep secure.
- 97HTML Tags
- 98HTMLIs the language for making webpages.
- 99—Make a heading on a webpage
- 100—Make a paragraph of text
- 101—Make text bold
- 102—Make text italic
- 103—Underline text
- 104—Create a link break
- 105—Insert an image
- 106—Create a hyperlink
- 107—The beta function was the first known scattering amplitude in string theory,
- 108—Hyper Link reference
Create a list
Defines unordered (bulleted) list
To contain web content - 109E-Voting reasonsOne reason they would use E-Voting because it is way easier than having to give it to people and them having it to hand it back it. Another reason it encourages people to vote because they know everyone does stuff online and they don't want to leave the house.
It would save the government money on paper aswell. - 110—
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- Karteikarten am Unit 1 revison flash cards, erstellt von Charlie Bond am 14/10/2019.
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