OCR•A-Level•Computer Science
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Exchanging Data
Compression, encryption, databases, networks, and web technologies
Practice 91 subtopics in Exchanging Data. All questions match the OCR A-Level specification.
About Exchanging Data
Exchanging Data is a key topic in the OCR A-Level Computer Sciencespecification. This topic covers compression, encryption, databases, networks, and web technologies.
Master all 91 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
All Subtopics (91)
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Lossy compressionLossless compressionRun-length encodingDictionary codingSymmetric encryptionAsymmetric encryptionPublic keyPrivate keyUses of hashingHash tablesHash collisionsRelational databasesFlat file databasesTablesRecordsFieldsPrimary keySecondary keyForeign keyEntity-relationship modellingEntity-relationship diagramsOne-to-oneOne-to-manyMany-to-manyReferential integrityNormalisationFirst normal form (1NF)Second normal form (2NF)Third normal form (3NF)SQLSELECTINSERTUPDATEDELETECREATE TABLEDROP TABLEALTER TABLEJOINWHEREORDER BYGROUP BYTransaction processingACIDRecord lockingRedundancyNetwork characteristicsTypes of networkLANWANProtocolsProtocol stackTCP/IP modelApplication layer protocolsHTTPHTTPSFTPPOP3IMAPSMTPTransport layerTCPUDPPortsNetwork layerIP addressingSubnettingDNSData link layerMAC addressesCSMA/CDCircuit switchingPacket switchingNetwork hardwareRoutersSwitchesHubsGatewaysFirewallsNetwork topologiesStarBusPhysical vs logical topologyClient-server modelPeer-to-peer modelHTMLCSSJavaScriptSearch engine indexingPageRank algorithmClient-side processingServer-side processing
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