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Edexcel GCSE Computer Science (1CP2) Exam Questions

Build a practice paper from 693 exam-style questions, each with its mark scheme and example answers. Print it, or answer it on paper and then open the mark schemes. Or browse the questions by topic.

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3 questions · 5 marks

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1Multiple choice1 markProtocols & Layers Swap Remove

Data is sent over a network using the TCP/IP model.

Identify the protocol that reassembles the packets at the destination.

[1 mark]
  • AFTP
  • BHTTP
  • CIP
  • DTCP
Mark scheme
  • D TCP (1)
  • The only correct answer is D. The correct answer is TCP.
  • A is not correct because FTP is used to transfer files
  • B is not correct because HTTP is used to request web pages
  • C is not correct because IP routes packets but does not reassemble them
Example answers and how they were marked
Full marks1/1

D TCP

Why: TCP reassembles the packets at the destination (1).

No marks0/1

C IP

Why: IP routes packets but does not reassemble them (0).

No marks0/1

B HTTP

Why: HTTP is used to request web pages, not to reassemble packets (0).

2Explain2 marksProtocols & Layers Swap Remove

The TCP/IP model has four layers.

Explain one function of the transport layer when a file is sent over a network.

[2 marks]
Mark scheme

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

  • Splits the data/file into packets (1) so each packet can be sent separately across the network (1)
  • Adds a packet/sequence number to each packet (1) so the packets can be put back into the correct order at the destination (1)
  • Detects lost/missing packets (1) so they can be requested/resent (1)
  • Creates a connection between the two computers/hosts (1) before the file is sent (1)

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

Allow 'segments' for 'packets' (TCP divides the data into segments, which become packets at the internet layer).

Do not accept 'sends the data/file' on its own without saying what the transport layer does to the data.

Do not accept naming TCP or a port number on its own without expansion.

Do not accept routing/addressing packets using IP addresses, which is the internet layer.

Example answers and how they were marked
Full marks2/2

The transport layer splits the data into packets so each packet can be sent separately across the network.

Why: Linked point (1) and reason (1): splitting into packets lets each one be sent separately.

Some marks1/2

It splits the data into packets.

Why: Point (1) identified, but no linked reason given, so only the first mark is awarded.

No marks0/2

It routes the packets using IP addresses so they reach the right destination.

Why: Routing using IP addresses is the internet layer, not the transport layer, so no credit is given.

3Explain2 marksWireless Connections Swap Remove

A wireless access point has a limited bandwidth.

Explain why connecting more devices to the access point can reduce the speed each device gets.

[2 marks]
Mark scheme

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

  • (All) devices share the bandwidth of the access point (1) so each device gets a smaller share, which reduces its speed/slows down transfers (1)
  • Bandwidth is the maximum amount of data that can be transferred at one time (1) so when devices send more data than this, the data must wait/queue, which slows down transfers (1)
  • (Many) devices send data at the same time (1) so the devices take turns, which reduces the amount of data each one can send/the speed each device gets (1)

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

Allow 'connection speed'/'download speed' for speed.

Do not accept 'the signal is shared' without saying that this reduces the bandwidth/data each device can send.

Do not accept the idea that adding devices increases the bandwidth.

Example answers and how they were marked
Full marks2/2

All the devices share the access point's bandwidth, so each device gets less bandwidth and its downloads take longer.

Why: Linked point (1): bandwidth is shared; reason (1): each device gets a smaller share, which reduces its speed/slows transfers.

Some marks1/2

The bandwidth is shared between all the devices.

Why: Point only (1): the bandwidth is shared. No linked reason about each device getting less bandwidth or a reduced speed.

No marks0/2

Adding more devices increases the bandwidth, so the network can send more data.

Why: Misconception that adding devices increases bandwidth; the mark scheme says not to accept this.

Questions by topic

2.1 Binary

Build a paper on this topic 58
Adding Binary Numbers 6 questions Binary and Hexadecimal Basics 10 questions Binary Shifts 6 questions Binary to Denary Conversion 6 questions Binary to Hexadecimal Conversion 6 questions Denary to Binary Conversion 6 questions Denary to Hexadecimal Conversion 6 questions Denary to Negative Binary Conversion 6 questions Hexadecimal to Binary Conversion 6 questions

2.2 Data representation

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Character Sets 18 questions Images 19 questions Sound 19 questions

2.3 Data storage and compression

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Compression 18 questions Units & Conversion 6 questions

3.1 Hardware

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Embedded Systems 17 questions Fetch Decode Execute Cycle 15 questions Primary Memory 15 questions Secondary Memory 15 questions Stored Program Computers 15 questions

3.2 Software

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File Management 18 questions Memory Management 16 questions Peripheral Management 11 questions Process Management 12 questions Purpose & Function of Operating Systems 17 questions Software Basics 13 questions User Management 18 questions Utility Software 19 questions

3.3 Programming languages

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Low and High Level Languages 19 questions Translators 18 questions

4.1 Networks

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Addressing 16 questions LANs & WANs 16 questions Network Speed 5 questions Packet Switching 16 questions Protocols & Layers 17 questions The Internet 16 questions Topologies 17 questions Wired Connections 17 questions Wireless Connections 18 questions

4.2 Network security

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Network Security Risks 18 questions Preventing Network Security Risks 18 questions

5.1 Environmental

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E-waste 17 questions Manufacturing Technology 19 questions

5.2 Ethical and legal

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Data Protection Act 17 questions Impact of AI 18 questions Intellectual Property 18 questions Software Licences 18 questions

5.3 Cybersecurity

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Malware 18 questions Social Engineering 18 questions

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