C3 Flashcards
Ad hoc
Temporary network with 2 or more devices that don’t need fixed hardware
Advantages of adhoc
Easy to set up
No specialist hardware
Disadvantages of adhoc
Less secure
No central control device
Poor signal reduces access to the internet
Sharing connection makes the device slow
Open Wi-Fi
Wi-Fi that doesn’t have encryption that is offered for free in public spaces
Security problems with open Wi-Fi
Hacker can view data because there’s no encryption
How to combat problems with open wifi
Only connect to wifi that has WPA2
Use vpn
Personal hotspot
A feature that allows you to connect devices to your phone and share wifi by using tethering
PAN
Personal area network
Connects devices together using wifi and Bluetooth
Devices need to be paired
Ways of connecting to the internet
Cables
Mobile
Satellite
Case study- festivals
Lots of people try to connect to the same network base station
So no signal
Companies can bring in more stations
Rural vs city
Cities have faster internet because there’s more people to share the cost of installing fibre cables
In rural areas they don’t have the money and often don’t have any infrastructure at all
Countries and Wi-Fi
Some countries have limited infrastructure
Fewer cables so have to use satellites which is expensive
Cloud storage
A way of storing files and folders remotely, using the internet
Cloud
Remote servers
Uploading
Using the internet to allow access to the document and others
Downloading
Taking a file and allowing you to see it even when there is no internet because it’s in your drive
Features of cloud storage
Access rights- user who shares the file restricts what other people can do to the document
Availability- can be accessed any where at any time with an internet connection
Syncing- when changes are made the system syncs all the files to make sure the content is the same
Scalable
Cloud computing
Having applications available online
Example of cloud computing
Google suite
Office 365 on browsers
Benefits of cloud computing
No need to install software
Less training needed
Scalable
Aspects to consider when choosing a cloud service provider
Disaster recovery - checking if the company has a plan in case anything goes wrong
Security of data - large companies have the resources and knowledge to keep up to date with security breaches
Performant issues with cloud technologies
Needs a reliable internet connection, using fibre optics
Some tasks are better suited to traditional computing methods, for example editing videos have large files that Amy not work well with cloud technologies
Private communications with stakeholders
Emails and live chats
Allows them to be notified of interesting developments and new features
Live chats can answer questions
Public communications
Social media
Website
He,ps market things and gives info
Local platform
Software that is installed as part of the computers operating system
Runs faster than a web app
Only accessible on the device so limits collaboration
Web based platform
Software is run from the cloud
Accessible anywhere via internet
Migh the slow of connection is slow
Why are systems attacked
Data and info theft
Personal challenge
Disrupting their business
Personal reasons
Financial gain
Industrial espionage
External threats
Come from outside the company
Ways of external threats
Unauthorised access- guessing passwords, black hat hacking
Malware-viruses, trojans, ransomeware
Denial of service attack - attacker floods the website with loads of requests that make the website unresponsive
Phishing - sends fake emails to gain access
Internal threats
Visiting untrustworthy websites
Following links in emails
Unintended disclosure of detail
Stealing into
USBs
Overriding security controls
Firewall
Acts as a filter for suspicious things
Trademark
Protects brands from other people using them.
Patents
Limited property that prevents others from copying an invention for up to 20 years.
Copyright
Protects creative works being copied or performed without the creators permission. Lasts for 70 years after their death.
Data flow
Inputs and outputs
Rectangle= system
Ovals: people
Arrows always go to systems and then entities
No start or end
Flow chart
Start and ends
Process : rectangle
Decision is a diamond
Function is a parallelogram
Bluetooth
Short range technology that connects multiple devices
Tethering
Where a smartphone acts as an access point allowing for others devices to connect
Personal hotspot
Using a internet connectivity when connected to a device to access the internet
Issues affecting network availability
Rural locations have less residents so they don’t get the same investment in infrastructure which means they have a poor network
Developing countries don’t have as much investment
If they have services like streaming that means it uses a lot of resources which can slow the system down
Blackspots- places that block wireless signals
