| OCR |
GCSE (9-1) Computer Science
Mark Scheme
J277/01: Unit 1.3 Networks
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| Question | Answer | Marks | Guidance |
|---|---|---|---|
| 1 |
|
4 |
AO1 (Knowledge)
1 mark per correct tick.
If a candidate ticks both boxes in a single row, award 0 marks for that row.
|
| 2a | LAN / Local Area Network | 1 |
Accept: WLAN (Wireless LAN).
|
| 2b | WAN / Wide Area Network | 1 | |
| 2c |
1 mark for geographical scale:
|
2 |
NE (Not Enough): "It is close together" or "In a building" without the concept of single site or small geographical area.
To get the ownership mark, they must imply the school controls the connection (not a telecom company).
|
| 3 |
Difference 1 (Geography): LAN covers a small geographical area (e.g. a house/school) (1)... ...Whereas a WAN covers a large geographical area (e.g. country/world). (1) Difference 2 (Infrastructure/Ownership): LAN infrastructure/hardware is owned by the organisation (1)... ...Whereas WANs use third-party / leased infrastructure (e.g. BT, satellites, fibre cables). (1) |
4 |
AO1 (Understanding)
Be strict on "infrastructure".
Allow: "Hired connections", "Telecommunication companies", "Leased lines" for WAN.
Reject: "WANs are wireless" (Both can be wireless).
Reject: "WANs are faster" (LANs are typically faster, but speed is not a defining definition in the spec).
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| 4a | WAN / Wide Area Network | 1 | |
| 4b |
1 mark for third-party concept:
|
2 |
AO1/AO2
The key here is that the Internet is a collection of networks connected via infrastructure we do not own individually. Focus on the "hired/leased" aspect.
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| 5 | Router | 1 |
Required to connect different networks (LAN to WAN).
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