IT Work: notes

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Digital Devices

list of Digital Devices:

smartphone

Tablet

Computer

Smart TV

Digital Camera

Smart Watch

Sat Nav

Media player

Home Cinema

Games Console

Laptop

connecting devices to devices (+peripherals)+connecting devices to the internet.keyword: peripheral= hardware that is added to extend what the device can do.

These are methods of connection.

wired or wireless

wired= aux cable, Ethernet cable, HDMI cable, USB cable

wireless= Bluetooth, Wi-Fi, NFC, infrared,

NFC= near field communication

advantages and disadvantages:

Bluetooth = limited distance 10m, drains battery

Wi-Fi = faster data transfer, wider range, drains battery

NFC = more secure, less range than Bluetooth

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Storage

small to large of size:

Bit

Byte (8 bits)

Kilobyte (Kb)

Megabytes (Mb)

Gigabyte (Gb)

Terabyte (Tb)

Petabyte (Pb)

where does storage get stored?

hardrive

memory card

SD card

Cloud storage

USB memory stick

CD (small capacity)

DVD

SSD (solid state drive - its expencive)

Blu-ray(large capacity)

hradrives has moving parts so it is more easy to break

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Advantages and disadvantages of Auctions

Advantages:

easy to search for products that you want

can trust people based on their ratings

payment is secure and arranged through 3rd party companies

lots of people selling means the buyer can get a bargain

able to sell what ever you like easily

guarantied sell

wider market range

guarantied to get the thing that you want

find things that you can not find locally

trust worthy websites such as Amazon and EBay that have good customer service just in case something goes wrong

Disadvantages:

the ratings are trustable too a point since the seller can either hire someone to create bots (which are fake accounts) to give the seller good ratings

scams

buyers need to know what they are doing

a method of payment

wait for delivery

hassle to send back if you don't want it

draw in bidding more because it can end up being a bidding war

could be misleading

don't know the buyer

its all about the trust of the buyer and seller

possible fake websites

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Presentation notes:

Bandwidth

Bits of data travel along the network connection

Bandwidth is the measure of capacity of a connection. measured in megabits per second.

Slow network reasons:

more data passing through, e.g. downloading or streaming a large file. (HD film)

sharing a network with others

Mobile data

provided by your phone company via you sim card

Wi-Fi

works by router

Ethernet cable versus Wi-Fi

less likely to suffer from interference-faster connection.

Payments

methods:

PayPal

credit card

debit card

cash

gift cards

third party payment site

encryption - the scrambling of data sent over the internet. data can only be decrypted by the computer with the correct key

contactless - NFC, £30 limit, +ves very fast (fastest method), very short range -ves if lose device/card could lose money

third party processors lets you accept online payments without a merchant account of your own

advantages

don't have to give out personal bank details

disadvantages

seller fees

can put payment on hold

keep credit card safe online

spider ware

don't buy stuff on a public computer might have malware

open Wi-Fi networks

Threats

security

passwords - first line of defence

do not use:

a pets name

a birthday

an address

a phone number

don't use the same password for everything

don't write it down

don't give away your password

good way to make a password is to take the first letter of a phrase or line from a song

use a mix of numbers !/?

the biggest risks to children online: online bullying, being groomed

the biggest risks for adults: Identity theft and fraud

phishing data - when they use things like emails to get you to click on them and then you get hacked to get your personal details

impersonal address click bate link scare tactics attachment

malware - spyware - cause damage or do harm or steal information

get through by downloads

viruses - software that corrupts the software and duplicates it for the user that did the virus

attach onto documents, email, downloads, SD stick memory

Trojans - viruses that disguises itself

-avoid "free" sites, file - sharing sites look at URL

-can take control of your computer

spyware is a malware were the hacker can record from the camera and are able to see what you are typing

worms is a malware were it slows down the computers and take up the bandwidth

protection

firewall - is a piece of software. blocks or permits connections. there to prevent authorized access .e.g. hacking, remote installation of files.

secure network - password protect your network. change the default password. hide the SSID of the router (service set identifier)

antimalware software - will block unauthorised viruses from installing onto your computer

encrypt data

data security

security risks

able to get your bank details

credit cards are more safe than a debit card

spend more that £100 get additional insurance from credit card company goes bust

phishing - fake emails, websites normally shown as normally emails or websites

look out for link on email spelling/grammar impersonal greeting

encryption

privacy settings restrict personal details online.

set up different groups (social media) with different access rights

passwords - allow access to different accounts

need a mixer of characters, numbers, longer that , different passwords for different accounts, not a common word

online shopping - only need to fill out required fields at checkouts

https://www.sonicwall.com/phishing/phishing-quiz-question.aspx

cookies + transactional data

www.commonvraft.com

cookies - small text file stored on your computer to help make using the internet more convenient. they store preferences (language), username, products you looked at

can be used to share information across sites which is why you may see adverts for items you have recently looked at.

different cookies

session cookies - erased when browser closed. only needed while the session is running

persistent cookies - stored on computer

3rd party cookies -a cookie stored on the computer by another company not the company being visited .e.g. visit tvguide.co.uk + Hyundai put a cookie on you're device

transactional data

information collected everytime you purchase something.

used to build up profiles about costumers + buying trends. eg. location of customer, time, browsing history, purchase.

helps the customer because can track delivery, may get special offers, targeted emails

companies store this data in database that can be searched + sorted but must be held security which is expensive for businesses

advantages

ensure privacy is safe guarded

find out relevant page for you

they remember the details you enter

they remember marketing

the can evaluate the advertisement

disadvantages

cookies are not secure

cookies track all the websites you visit

can take up space

advantages for businesses

they can tell the site how the visitor found you

tell you how many pages visited

number of sites visited

the cookie law

a piece of privacy legislation that requires website to get consent from visitors to store or retrieve any information on a computer, smartphone or tablet.

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