extranet
restiricted/private network which is controlled by the company, it allows access for authorised customers
what is a possible health problem with using a mouse for too long?
repetitive strain injury
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extranet
restiricted/private network which is controlled by the company, it allows access for authorised customers
what is a possible health problem with using a mouse for too long?
repetitive strain injury
what are two characteristics of RAM?
temporary and volatile
advantages of using cloud storage rather than SSD
it has a greater storage capacity, data is sent directly, storage capacity can be increased, automatic backup of data, user is able to share the data with others
disadvantages of using cloud storage over SSD
cloud storage needs internet connection to access data, security issues with cloud as multiple copies of the data is stored, cloud storage has ongoing cost, user loses control over storage of the data
similarities of wifi and bluetooth
both use wireless communicaiton, both use radio frequencies for communication, both allow several devices to be connected, both use security when sending data
advantages of using internet banking
reduces number of journeys to and from the bank, saves moeny as fewer journeys are made, reduces time wasted, 24/7 banking, no physical robberies
disadvantages of internet banking
security issues, user needs reliable internet connection, more risk of phishing/fraud/pharming, easier to make errors
strategies to stay safe on social media
don’t give people personal information, dont open/click suspicious links/adverts, dont become friends with people you dont know, set security so only friends can conntact you
difference between backing storage and internal memory
backing storage is non volatile only whilst for internal memory data can either be volatile or non volatile, internal memory is directly accessed by the CPU whilst backing storage isn’t, backing storage is permanent storage while internal memory can be permanent or temporary storage, storage devices have slower access rates, backing larger storage capacity
disadvantages of GUI
takes up a large amount of hard disk space, need a significant amount of RAM to run, they use a lot of processing power, restricted to pre determined options
disadvantages of laptop compared to a desktop
more difficult to repair, harder to replace components as it is not standardised, more expensive to repair, tend to have smaller screens, internet connection isnt as stable
examples of direct data entry devices
magnetic stripe reader, radio frequency identification reader(RFID), optical mark reader, optical character reader, bar code reader, QR scanner, biometric scanner
what are two other functions of a router?
connecting networks and devuces to the internet, storing computer addresses, forward packets based upon a routing table
The System Life Cycle
structured approach for planning, designing, creating, testing, deploying, and maintaining a
system or software application.
stages of system life cycle
analysis, deisgn, development and testing, implementation, documentation, evaluation
analysis
finding out how the curent system works and what the requirements of the client are the new system. in this phase you would assess, define requirements as well as analyse a problem or opportunity.
observation
invloves the analyst watching the proceses that take place within an organisation to find out how everyday tasks are completed.
observation advantages
reliable data, provides an overall system view, inexpensive, shows all inputs/outputs
observation disadvantages
staff may act differently when observes, rule reaking behavious may be hidden
interview
one on one sessions between the analyst and user to explore specific system aspects
interview advantages
encourages open, honest answers, allows deeoer probing, questions can be adapted during the interview, observes body language
interview disadvantages
time consuming, expensive, no anonymity so honesty may be affected, interviewees may give expected answers, scheduling can be difficult
questionnaire
distributed to gather views from users to clinets about the current system
questionnaire advantages
quick to answer, inexpensive, ensures anonymity for truthful answers, quick data analysis, more participants involved
questionnaire disadvantages
low response rate, questions are generic which limits follow ups, no way to clarify vague answers, users may exaggerate responses, anonymous responses may be less serious
looking at existing documents
reviewing files, manuals and records to understand the current system and its requirements
looking at existing documents advantages
provides unique information, analyst sees firsthand how the system works
looking at existing documents disadvantages
time consuming, expensive due to analyst involvement
data flow diagrams
used to analyse the inputs, outputs, and processes of a system under review
what does the data flow diagram help identify?
inputs to the current system, outputs produced by the system, processing tasks and storage needs, any existing problems in the system, user and information requirements
user requirements
written by the analyst in simple, non technical language for business managers to confirm that the proposed system matches their needs
information requirements
what data is needed, when is it needed
what does a systems analyst specify?
who are the customers are and how they interact with the new system, who the vendors are and their interaction with the system, who the employees are and their interaction with their system
what does a system specification contain?
the hardwrae and software requirement for the new system are detailed in this document, it starts by identifying the necessary software, as the hardware depends on it. the analyst specifies only the software essential for system operation, which may vary for different user types and servers. once the software is determined, the minimum hardware needed to run it is outlined
input hardware identification and justification
barcode readers, scanners, touch screens
output devices hardaware identification and justification
3D printers, large monitors, speakers
software identifiaction and justification
operating system, application software, bespoke software (tailored to the company’s requirements but expensive and time consuming to develop)
type of storage required for analysis
HDD/SSD, magnetic tape
design phase
aims to create a comprehensive blueprint for the system, detailing how it will function, what it will looks like and how different components will interact.
what does the design phase look at?
data structures, input formats, output formats, validation routines
use of an SSD with a small capacity
to store the operating system because there would be faster downloads
use of a HDD with a large capacity
to store software/apps, can save larger files
which typically has a slower access speed? backing or internal memory?
backing storage
what has a bigger storage? backing or internal memory?
backing storage
solid state advantages
fast access, no moving parts
magnetic drive advantages
high capacity, low cost per GB
magnetic disk disadvantages
has moving parts, slower access time and is affected by magnetic fields
solid date disadvantages
expensive, limited write cycles
blu ray
requires specific hardware, has high definiton video and high capacity data storage
benefits of having a microprocessor at home
saves time to do tasks, allows user to have more leisure time, users aren’t doing a lot of manual work which reduces injuries,
what is the difference between input and output devices?
an input device, which is controlled by the user, sends data to the computer for processing, an output device, which is controlled by the computer, recieves data from the computer, and displays results of processed data
identify two methods of analysing the current system
observation, questionnaire
benefits of using a computer model
cheaoer than building the real object, can be safely tested under extreme conditions, can be used to find unexpected problems, able to test different scenarios
drawbacks of using computer model
mistakes can be made in programming, the cost of setting up a computer model can be high, reactions to the model might not be realistic/reliable.
differences between backing storage and internal memory
backing storage us not temporary or volatile, internal memory is primary while backing storage is secondary, backing storage has slower access rate, backing storage had larger memory capacity, internal memory is directly accessed by CPU
evaluate a user using cloud storage
user only pay for what is used, the user can access data from different computers. The student can also easily share the data to others. Cloud storage is vulnerable to security issues such as phishing/pharming/hacking. Requires a stable internet connection or not data control is lost.