Part three of my June 2025 Paper 1 (0417/11) walk-through. These three topics — sat-nav in the real world, keeping database data trustworthy, and how devices connect on a network — are all about applying knowledge to a scenario, which is exactly what the longer-mark questions reward. Here's how to think about each one.
📄 The original paper and mark scheme are on the Cambridge International past papers page. The questions below are paraphrased and the answers written in my own words.
Satellite navigation in the real world
One question described walkers using smartphone sat-nav in remote areas and asked for a discussion of the benefits and drawbacks.
Read the command word. "Discuss" and the 6-mark tariff are telling you the examiner wants a balanced, two-sided answer — several benefits and several drawbacks, each tied to the specific scenario (walkers, remote areas). Generic praise like "it's quicker" scores nothing; "it shows your real-time position so a walker is less likely to get lost" does, because it connects the feature to an outcome.
Benefits worth making:
- Real-time positioning, so walkers always know where they are without carrying paper maps.
- Estimated arrival times and route suggestions, including safer or shorter paths.
- Digital maps can be more up to date than a printed map bought years ago.
Drawbacks worth making:
- Signal can drop in remote areas — the one place walkers most need it — leaving them stranded.
- Battery drain; a flat phone means no map at all, whereas paper never runs out of charge.
- Over-reliance: if walkers stop carrying a backup map and compass, a device failure becomes dangerous.
The strongest answers also note a balanced conclusion — sat-nav is a useful aid but shouldn't fully replace traditional navigation in remote terrain. That bit of judgement is what pushes a discussion answer into the top band.
✏️ Practice it: "A delivery driver uses sat-nav in a busy city. Give one benefit and one drawback that are specific to this situation rather than to remote walking."
Validation vs verification — the topic students mix up
Another question tested the difference between validation and verification: matching validation checks to fields, explaining why both are needed, and naming a verification method.
Get the distinction crystal clear, because it's the whole topic:
- Validation checks whether data is reasonable — it's done automatically by the computer when data is entered.
- Verification checks whether data has been entered/copied correctly — it's about catching typing or transfer mistakes.
The key insight examiners reward: validation can't guarantee data is correct, only sensible. A date of birth of 12/12/2005 might pass every validation check and still be the wrong date for that person — only verification (comparing against the source) catches that. That's exactly why both are needed: each catches errors the other misses.
Common validation checks (worth memorising)
| Check | What it does | Good field to use it on |
|---|---|---|
| Format (picture) check | Data matches a set pattern | Date of birth (DD/MM/YYYY) |
| Range check | Number falls between limits | Age, price |
| Length check | Right number of characters | Postcode, password |
| Type check | Data is the right type | A "quantity" field must be a number |
| Presence check | A required field isn't left blank | Email address on a form |
| Check digit | Extra digit confirms a long number was typed correctly | Barcodes, ISBNs |
Verification methods are simpler: double entry (type it twice and the system compares) or visual check / proofreading (a person compares the entered data against the original document).
✏️ Practice it: "A shop records product prices between £0.50 and £500. Name the most suitable validation check, and explain one error it would not catch (so verification is still needed)."
Networking devices and connecting over Wi-Fi
The final question asked about the purpose of a network switch, how a smart TV connects to Wi-Fi, and what type of network it joins.
What a switch actually does. A switch connects devices on a LAN and forwards each piece of data only to its intended recipient, using the device's MAC address. That targeted delivery is the whole point — it keeps unnecessary traffic off the network and makes it more efficient.
Switch vs hub — the classic confusion
| Hub | Switch | |
|---|---|---|
| Where it sends data | To every device (broadcast) | Only to the intended device |
| Network traffic | High — lots of wasted transmissions | Low — targeted delivery |
| "Intelligence" | None | Uses MAC addresses to direct traffic |
If a question asks about a switch, the words "intended recipient" and "reduces traffic" are your mark-earners — they're exactly what separates it from a hub.
Connecting a smart TV to Wi-Fi — describe the steps in order: open the TV's network settings, select your network from the list of available SSIDs, enter the password, and the TV connects. Because it's joining a wireless home network, the network type is a WLAN (wireless local area network).
✏️ Practice it: "Explain why a home with many wireless devices streaming video at once might run more smoothly on a network using a switch than one using a hub."
Quick recap
- Sat-nav answers need both sides and a scenario-specific judgement — never one-sided generic praise.
- Validation = is the data sensible? Verification = was it entered correctly? You need both because each catches what the other can't.
- A switch sends data only to the intended device (unlike a hub, which broadcasts to all), and a smart TV joining home Wi-Fi connects to a WLAN.
Part 2 https://www.techiemike.com/igcse-ict-june-2025-paper-1-0417-11-testing-safety-security/
