Networks, cloud services and communication
Explain how devices connect and exchange data, and choose network and communication arrangements with security and reliability in mind.
Section 4 · Networks and the effects of using them
Exam scope and assessment notes
Cambridge IGCSE Information and Communication Technology 0417, for exams in 2026, 2027 and 2028. Examples, datasets and practice are original StudyForA material; they are not Cambridge questions, source files, mark schemes or grades. Practical lessons teach transferable operations, but learners must perform them in locally available office and web-authoring software and inspect their own files. This site does not reproduce a Cambridge practical examination or award an official grade. The separate 2029 syllabus is not mapped here.
Before you begin
- No previous ICT course is assumed. Read each scenario carefully and justify a tool or method by connecting it to the task, user and constraints.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which connection is normally designed for nearby peripherals such as a headset?
What you will learn
- Explain the roles of routers, NICs, hubs, bridges and switches, and compare LAN, WLAN and WAN.
- Compare Wi-Fi with Bluetooth and distinguish the internet, an intranet and an extranet.
- Explain cloud storage and conferencing, including data sharing, hardware, software, connection, privacy and availability.
- Describe data-transfer risks, authentication, anti-malware and practical protections.
Connect devices and route data
A NIC connects a computer to a network. A switch forwards data within a local network to the intended device; a hub repeats it to connected ports; a bridge joins network segments. A router connects different networks, stores address information and forwards packets toward their destination.
A LAN covers a limited local site; a WLAN is a wireless LAN; a WAN spans a wider geographical area. Wi-Fi commonly joins devices to a local network, while Bluetooth links nearby devices over a shorter range. The internet is a public global network; an intranet is private to an organisation; an extranet gives selected outsiders controlled access.
Cloud and communication need controls
Cloud computing stores, manages or shares data on remote services accessed over a network. It can make collaboration and remote access easier, but depends on connection, provider availability, privacy settings, storage costs and recovery plans.
Video, audio and web conferencing need compatible hardware, software and network capacity. Data transfer can be exposed to interception or malware. Use strong unique passwords, suitable authentication, up-to-date anti-malware, secure transfer, verified downloads and appropriate access; scanning a file cannot prove that every threat is absent.
Sources for this lesson
Pause and explain
A company lets a supplier view one stock portal but not its internal staff files. What network environment fits this controlled outside access?
Worked example
A school wants teachers to edit shared planning files from home and hold live meetings. Explain one suitable network arrangement and two risks to manage.
Show the worked solution
- Use authenticated cloud storage for shared files and conferencing software for meetings.
- Teachers connect through internet access; a router directs local traffic.
- Control who can view/edit, protect accounts, back up files and plan for outages.
Answer Authenticated cloud storage and conferencing can support remote collaboration, with staff devices connected through a router and internet service. The school must restrict file access and protect accounts against interception or phishing; it should also plan for connection or provider outages and keep recoverable backups.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Distinguish a router, switch and NIC in a school network that connects classroom computers to the internet.
Give me a hint
Follow the path from a computer's network connection to the local device and then to another network.
Compare my reasoning
- The NIC provides the computer's network interface.
- A switch forwards local traffic among devices on the school LAN.
- The router connects the LAN to other networks and routes packets.
The NIC connects each computer to the network. The switch directs local traffic within the school LAN. The router connects that LAN to another network, such as the internet, and forwards packets using addressing information.
Look for these in your work
- States distinct roles
- Uses the local-to-internet data path
Choose between Wi-Fi, Bluetooth and a wired LAN for (a) a laptop joining the school network, (b) a nearby wireless keyboard and (c) a fixed desktop that needs a stable connection.
Give me a hint
Match range, mobility and reliability to the job.
Compare my reasoning
- A laptop needs a local network connection with mobility.
- A keyboard exchanges data with a nearby device.
- A fixed desktop can prioritise a stable wired local connection.
(a) Wi-Fi; (b) Bluetooth; (c) a wired LAN connection. Wi-Fi still needs an access point and network permission; Bluetooth's short range is useful for peripherals; wired links can be more stable but reduce mobility.
Look for these in your work
- Selects an appropriate connection
- Explains a trade-off
A teacher shares learner records through a cloud link. Recommend controls for confidentiality and continuity.
Give me a hint
Cover identity, access, transfer and recovery.
Compare my reasoning
- Restrict access to authenticated, named users and the minimum necessary data.
- Use strong authentication and secure transfer; check sharing settings before sending.
- Keep a tested backup and a plan for service outages or accidental changes.
Use named accounts with strong authentication and least-privilege access; avoid public links, verify recipients and use secure connections. Keep a separate tested backup and recovery process for outages or accidental deletion. Cloud access is convenient but does not remove the school's duty to protect data.
Look for these in your work
- Protects access and transfer
- Includes a recovery measure
Common mistakes
- Calling a router a simple signal booster instead of explaining packet routing between networks
- Treating cloud data as automatically private or always available
- Confusing a Wi-Fi connection with internet access
What can you explain now?
What does a router do when data must travel from one network to another?
Compare with the explanation
It forwards packets between networks using address information.
A router connects networks and routes data packets toward their destination.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Explain how a router, switch and NIC differ, then state one security control and one cloud-service limitation.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.