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Edexcel GCSE Computer Science (1CP2) Exam Questions

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1Short recall2 marksLANs & WANs Swap Remove

A school has computers in every classroom.

Define the term 'local area network (LAN)'.

[2 marks]
Mark scheme

Award one mark for any of the following up to a maximum of two marks:

  • A network that covers a small geographical area / is on a single site / is within one building (1)
  • (Two or more) computers/devices connected together (1)
  • So that the connected devices can share data/files/resources such as printers or an internet connection (1)
  • Uses cabling/infrastructure owned by the organisation (1)

Do not accept a network that covers a large geographical area / connects networks in different countries, as this describes a WAN.

Do not accept 'a network in a school' on its own, as this repeats the stem without a LAN feature such as a single site or connected devices.

Do not accept 'a network that connects to the internet' without a LAN feature such as a single site or connected devices.

Do not accept 'owned by one organisation' on its own, as a WAN can also be owned by one organisation.

Do not accept 'local' on its own without saying what it means.

The share mark needs the sharing to be linked to the connected devices/network, e.g. 'share files' or 'share printers'.

Example answers and how they were marked
Full marks2/2

A LAN is a group of computers connected together on one site, such as a school, so that they can share files and printers.

Why: Connected together (1) and single site (1); the sharing point is also made but the maximum is two marks.

Some marks1/2

A network that is in one building.

Why: Covers a single site/one building (1) but does not say that devices are connected together or what they share.

No marks0/2

A network that covers a large area and connects different countries.

Why: Describes a WAN, not a LAN, so no creditworthy LAN point is made.

2Short recall1 markAddressing Swap Remove

Devices are given IP addresses.

Define the term dynamic IP address.

[1 mark]
Mark scheme

Award one mark for:

  • (An IP address that) can change / is not permanent (1)

Allow a changing IP address.

Allow a temporary IP address.

Allow it is assigned each time the device connects to the internet.

Do not accept an IP address that is assigned (automatically) by a router/DHCP without any idea that it can change.

Do not accept static IP address / fixed IP address / an IP address that never changes (this is a static IP address).

Example answers and how they were marked
Full marks1/1

An IP address that can change each time the device connects to the internet.

Why: States that the IP address can change (1).

No marks0/1

An IP address that is assigned automatically by a router.

Why: Describes assignment only; the mark scheme does not accept assignment without the idea that the address can change.

No marks0/1

An IP address that never changes.

Why: Confuses dynamic with static; the Do not accept line applies.

3Explain2 marksPacket Switching Swap Remove

Data is split into packets before it is sent across the internet.

Explain why each packet has a packet number in its header.

[2 marks]
Mark scheme

Award up to two marks for a linked explanation such as:

  • The receiver can put the packets back into the correct order (1) because packets may arrive out of order/take different routes (1)
  • The receiver can see if a packet is missing (1) because the sequence of numbers shows a gap (1)
  • The receiver knows when the whole file has arrived (1) because the total number of packets/last packet number is known (1)

For both marks, the expansion must follow/associate with the statement.

Allow 'so the packets can be put back in the correct order/reassembled' for the first mark, but the second mark needs the reason, i.e. packets may arrive out of order/take different routes.

Do not accept 'so the packets can be identified' without stating what the number is used for, e.g. reordering or spotting a missing packet.

Do not accept 'so the router knows where to send it' - the router uses the destination IP address, not the packet number.

Example answers and how they were marked
Full marks2/2

The receiver can put the packets back in the correct order because they may arrive out of order.

Why: Linked point (1) and reason (1): the packet number allows reordering because packets can arrive out of order.

Some marks1/2

It shows the receiver the order of the packets.

Why: The point is given (1) but there is no linked reason, such as packets arriving out of order.

No marks0/2

So the router knows which route to use.

Why: Routers use the destination IP address, not the packet number, so this earns nothing; it is named in the mark scheme as a 'Do not accept'.

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