Computer Science AS CIE
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data-representation as5 主题
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multimedia as3 主题
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compression as2 主题
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networks-and-the-internet as11 主题
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computers-and-components as5 主题
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logic-gates-and-logic-circuits as2 主题
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central-processing-unit-cpu-architecture as6 主题
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assembly-language- as4 主题
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bit-manipulation as1 主题
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operating-systems as3 主题
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language-translators as2 主题
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data-security as3 主题
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data-integrity as1 主题
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ethics-and-ownership as3 主题
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database-concepts as3 主题
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database-management-systems-dbms- as1 主题
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data-definition-language-ddl-and-data-manipulation-language-dml as1 主题
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computational-thinking-skills as1 主题
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algorithms as4 主题
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data-types-and-records as2 主题
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arrays as2 主题
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files as1 主题
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introduction-to-abstract-data-types-adt as1 主题
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programming-basics as1 主题
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constructs as2 主题
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structured-programming as1 主题
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program-development-life-cycle as1 主题
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program-design- as2 主题
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program-testing-and-maintenance as3 主题
cloud-computing- as
Exam code:9618
Cloud computing
What is cloud computing?
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Cloud computing is when software, services or files are hosted entirely on remote servers
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Accessed through the internet
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The two most common cloud computing examples are:
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Cloud storage
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Cloud software
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Cloud storage
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Cloud storage is long-term storage of data that resides in a remote location
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Accessible only via the Internet (WAN)
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Data is stored on remote servers in data centres
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Storage is usually on HDDs (magnetic) but increasingly SSDs (solid state)
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Examples include: Google Drive, Dropbox, OneDrive
Cloud software
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Cloud software is hosted and managed remotely
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The user accesses the software online (on demand)
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The provider handles:
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Maintenance
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Upgrades
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Security
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Typically paid for via a monthly fee or yearly subscription
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Examples include: Google Docs, Microsoft 365, Adobe Creative Cloud
Worked Example
A company uses cloud computing.
Define cloud computing. [1]
Answer
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Accessing a service/files/software on a remote server [1 mark]
Benefits and drawbacks of cloud computing
Cloud storage
|
Benefits |
Drawbacks |
|---|---|
|
Accessibility – access files from anywhere with an internet connection |
Needs a reliable internet connection – slow or no connection can stop access to files |
|
Easy to share and collaborate with others |
Can be expensive – especially for large amounts of data or long-term use |
|
Works on any device with internet access |
Ongoing costs – often requires a monthly or annual subscription |
|
Scalability – storage can be increased or decreased as needed |
May need to pay for extra data transfer (upload/download limits) |
|
Reliability – data is backed up across multiple servers |
Security risks – data sent over the internet could be intercepted |
|
Security features – encryption, multi-factor authentication |
Less control – provider manages security, but you’re still responsible for protecting user data |
|
No need to buy expensive storage hardware |
|
|
No need to hire specialist IT staff – support is handled by the provider |
|
|
Eco-friendly – centralised data centres are more efficient than millions of local servers |
Cloud software
|
Benefits |
Drawbacks |
|---|---|
|
Accessible anywhere – use the software on any device with an internet connection |
Needs internet access – won’t work properly offline |
|
No installation needed – runs through a browser or app |
Performance depends on internet speed – slow connections can affect usability |
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Automatic updates – provider handles all software updates and patches |
Ongoing costs – usually requires a monthly or yearly subscription |
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Maintenance is handled – no need for specialist IT staff to manage or fix the software |
Data privacy concerns – your data is stored on the provider’s servers |
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Scalable – easy to upgrade or downgrade your software plan |
Less control – provider decides when updates or changes are made |
|
Security included – providers manage security features like firewalls and encryption |
Legal responsibility – you’re still responsible for how personal data is stored, even if it’s hosted |
|
Often works across multiple devices – laptops, tablets, phones |
Some features may be limited compared to full versions installed on a local device |
Public & private clouds
What is the difference between a public and a private cloud?
|
Type |
Public Cloud |
Private Cloud |
|---|---|---|
|
Ownership |
Servers are owned and managed by a third-party provider |
Servers are owned and managed by the company itself |
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Access |
Services are shared with other organisations or users |
Access is restricted to that company or organisation |
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Examples |
Google Drive, Microsoft 365, Dropbox |
Company intranet, internal company cloud servers |
|
Cost |
Cheaper – shared infrastructure reduces cost |
More expensive – company pays for hardware, maintenance, and staff |
|
Control |
Less control over data and security settings |
More control – company manages its own data and security |
|
Security |
Relies on provider’s security measures |
Can apply custom security policies and have full oversight |
Worked Example
Give two benefits and one drawback of using cloud computing. [3]
Answer
1 mark each from:
Public
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Computing services offered by 3rd party provider over the public Internet [1 mark]
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Public is open/available to anyone with the appropriate equipment/software/credentials [1 mark]
Private
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Computing services offered either over the Internet or a private internal network [1 mark]
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Only available to select users not the general public [1 mark]
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Private is a dedicated/bespoke system only accessible for/from the organisation [1 mark]
Responses