Networks

Worked examples (9)

• 1Name the four layers and match each to its job
• 2Identify the parts of a packet
• 3Explain what happens when packets arrive in the wrong order
• 4Work out how many packets a file becomes, and the overhead
• 5Assign each step of a web request to a layer
• 6Explain why a message is split into packets
• 7Track a message down the sender's stack and up the receiver's
• 8Assess layering against a single all-in-one protocol
• 9Analyse whether re-requesting lost packets is always right

Model answers (9)

• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response

Worked examples (9)

• 1Classify three described networks
• 2Give two reasons for connecting computers
• 3State one difference between client-server and peer-to-peer
• 4Recommend a model for a four-person business
• 5Recommend a model for a 400-machine school
• 6Explain the drawbacks of networking an office
• 7Resolve a LAN-or-WAN boundary case
• 8Evaluate a peer-to-peer network that has outgrown itself
• 9Describe a network using both dimensions at once

Model answers (9)

• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response

Worked examples (9)

• 1Classify four connection methods
• 2State the unit and convert it to bytes
• 3Explain one advantage of wired over wireless
• 4Calculate a download time
• 5Choose the connection method for each part of a building
• 6Compare download times before and after an upgrade
• 7Justify fibre optic for a link between two buildings
• 8Evaluate replacing a wired network with Wi-Fi
• 9Calculate a file size, then its transfer time

Model answers (9)

• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response

Worked examples (9)

• 1Define a protocol and say why one is needed
• 2Name the protocol for each described task
• 3State the purpose of Ethernet and of Wi-Fi
• 4Explain why a login page must use HTTPS
• 5Describe the separate roles of TCP and IP
• 6Choose between POP3 and IMAP for a scenario
• 7Trace every protocol used when a web page loads
• 8Assess a recommendation to use FTP
• 9Evaluate a proposal to move a school to POP3

Model answers (9)

• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response

Worked examples (9)

• 1Identify each topology from its description
• 2Give advantages and disadvantages of a bus topology
• 3Distinguish a cable failure from a switch failure in a star
• 4Calculate the cabling cost of a full mesh as it grows
• 5Compare a bus and a star point by point
• 6Explain token passing and the cost of joining a ring
• 7Recommend and justify a topology for a hospital
• 8Evaluate the claim that the star is always the best topology
• 9Analyse a hybrid network of several stars joined together

Model answers (9)

• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response

Worked examples (9)

• 1Explain what a generation of mobile standards is
• 2Say what 3G and 4G each made possible
• 3Explain latency, and why it is not the same as speed
• 4Explain why a new generation reaches cities first
• 5Explain backwards compatibility and why it is provided
• 6Choose a generation for a remotely operated port
• 7Discuss the impact of 5G on a rural community
• 8Assess the claim that 5G is merely a faster 4G
• 9Evaluate switching off a 3G network

Model answers (9)

• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — short open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response
• ✓Model answer — Edexcel 4CP0 Paper 1 style — extended open-response