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Learn: Protocols, Layers, and Topologies
OCR GCSE J277 Computer Science specification
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Welcome!Today we'll explore protocols, layers, and topologies, key concepts in computer networks. These ideas help us understand how data travels securely and efficiently between devices. Let's break them down step by step!
What are Protocols?Protocols are sets of rules that define how data is transmitted between devices. They ensure computers can communicate effectively, even if they're made by different manufacturers. Examples include HTTP (for web pages) and TCP/IP (for routing and reliable delivery).
Which protocol is commonly used for web page requests?
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Why Use Layers?Network layers divide communication tasks into smaller, manageable steps. Each layer performs specific functions and interacts with the layer above and below it. This simplifies troubleshooting and allows different technologies to work together efficiently.
Network layers break down communication tasks into {{blank0}} steps. Each layer interacts with the layer {{blank1}} it.
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What are Topologies?Network topologies describe the arrangement of devices in a network. They determine how devices are connected and how data flows between them. Common examples include star and mesh topologies.
Match the items on the left with their correct pairs on the right
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Star TopologyIn a star topology, all devices connect to a central device, like a switch or hub. If one device fails, it doesn't affect the others, but if the central hub fails, the entire network goes down.
What happens if a device in a star topology fails?
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Mesh TopologyIn a mesh topology, devices are directly connected to each other. This makes the network more reliable because data can take multiple paths. However, it requires more cabling and setup.
Which statements are true about mesh topologies? (Select all that apply)
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Review Time!Great work! You've learned about protocols, layers, and topologies. Now let's test your understanding with a few review questions.
Which protocol is used for secure web page transfer?
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Which of the following are benefits of layering in networks? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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