{"id":374,"date":"2023-06-21T21:39:42","date_gmt":"2023-06-21T21:39:42","guid":{"rendered":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/?page_id=374"},"modified":"2023-09-12T09:15:09","modified_gmt":"2023-09-12T09:15:09","slug":"network-layers","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/network-layers\/","title":{"rendered":"Network Layers"},"content":{"rendered":"
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OSI Model<\/h2>\n
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Network Layers and Protocols<\/h1>\n

OSI Model<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Layer Name<\/strong><\/td>\nPurpose<\/strong><\/td>\nProtocols<\/strong><\/td>\nmnemonic<\/strong><\/td>\n<\/tr>\n
Application<\/td>\nHuman Machine Interface \u2013 Where data is entered, Connects application to network<\/td>\nDNS,HTTP,SMTP,POP3,FTP<\/td>\nAll<\/td>\n<\/tr>\n
Presentation<\/td>\nData coded into 1s and 0s, or decoded, depending on file format<\/td>\nJPEG,MIDI,TIFF,SSL,SSH<\/td>\nPeople<\/td>\n<\/tr>\n
Session<\/td>\nWhere secure sessions created, authentication takes place<\/td>\nNetBIOS,<\/td>\nSeem<\/td>\n<\/tr>\n
Transport<\/td>\nError checking it conducted here. Chooses which transport protocol to use<\/td>\nTCP,UDP,End-toEnd<\/td>\nTo<\/td>\n<\/tr>\n
Network<\/td>\n\u00a0Addressing and Routing<\/td>\nIPV4,IPV6,IPSec<\/td>\nNeed<\/td>\n<\/tr>\n
Data-Link<\/td>\nThis layer is where the data is prepared for sending<\/td>\nEthernet,PPP,ATM<\/td>\nData<\/td>\n<\/tr>\n
Physical<\/td>\n\u00a0Data is physically sent along a wire, fiber optic cable or radio waves.<\/td>\nEthernet, USB, Bluetooth,IEEE802.11<\/td>\nProcessing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Activity –\u00a0<\/strong>Watch the video below and fill out the worksheet (in the resources section) as you go through.<\/p>\n

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https:\/\/www.youtube.com\/watch?v=Cbqsm23zgMQ<\/a>