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OSI reference model Layer I
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Takashi Funato
April 19, 2021
Technology
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OSI reference model Layer I
ネットワーク勉強会のOSI参照モデルのレイヤ1の説明です。
Takashi Funato
April 19, 2021
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Transcript
ωοτϫʔΫೖษڧձ OSIࢀরϞσϧ ୈ 1 : ཧ Takashi Funato 2020.04.19 1
Agenda •ཧͱ •༷ʑͳཧ •·ͱΊ 2
ཧ 3
ཧ • ཧͱOSIࢀরϞσϧͷୈҰʢϨΠϠ̍ʣͰɺిؾ৴߸ޫ ిͳͲͰɺసૹΛߦ͏ͨΊͷཧతͳίωΫγϣϯΛ୲͏෦Λఆ ٛͨ͠ͷ • ཧతͳஔͰɺཧݱʢిؾతͳ৴߸ͷतडͳͲʣΛѻ͏ • ௨৴ഔମΛྲྀΕΔ৴߸ͷܗࣜɺཧతͳ༷ΛఆΊΔ •
ωοτϫʔΫߏ͢ΔͨΊͷ࠷ԼϨΠϠ 4
༷ʑͳཧ 5
༷ʑͳཧ 1 ۙͳͷ • Wi-Fiϧʔλ • Wi-Fi ػثن֨ʢIEEE 802.11ʣ •
LANέʔϒϧʢCAT5eͱ͔ʣ • RJ-45ϓϥά • LANέʔϒϧΛྲྀΕΔిؾ৴߸ͷن֨વܾΊΒΕ͍ͯΔʢΠʔαωοτ: 10Base-Tͱ͔ʣ • Hub • ࠓͰεΠονϯάϋϒ͕ओྲྀʢL3εΠονͳͲߴػೳͳ͕ग़͍ͯΔʣ • ੲ͋ͬͨϦϐʔλʔͱݺΕΔHubίϦδϣϯى͜Γ͕ͪ 6
༷ʑͳཧ 2ʢੲʣ • 56kbpsϞσϜ • μΠΞϧΞοϓଓʹΑΔΠϯλʔωοτଓʢςϨϗʔμΠʣ • σεΫτοϓPCͷPCIόεISAόεʹɺࠩͯ͠ిઢΛͭͳ͙ • ISDNϞσϜ
• ެऺަిΛར༻ͨ͠σδλϧ௨৴ʢ64kbpsʣ • ADSLϞσϜ • ެऺަిΛར༻ͨ͠Πϯλʔωοτଓ 7
༷ʑͳཧ 3ʢੲʣ • RS232 • ίϯϐϡʔλಉ࢜Λͭͳ͙ͨΊͷݹͷن֨ʢϓϦϯλͳΜ͔ʣ • γϦΞϧϙʔτCOMϙʔτͱݺΕͨ • ʢࠓͰݹ͍ωοτϫʔΫػث͜ΕͰͭͳ͙͔͠Εͳ͍ʣ
8
༷ʑͳཧ 4 ޫ௨৴ͷ࣌ • FTTH • ޫϑΝΠόΛૹ࿏ͱͨ͠ޫ௨৴ • ऴஔͱͯ͠ONUΛ͏ •
ޫέʔϒϧ • ຊதʹுΓ८Β͞Εͭͭ͋Δ • ւఈޫέʔϒϧ • ւఈΛ௨ͬͯੈքதʹுΓ८Β͞Ε͍ͯΔ 9
༷ʑͳཧ 5 ੈքنͷޫ௨৴ͷ࣌ https://www.submarinecablemap.com/ • μΠΞϧΞοϓ 56kbps • ADSL 50Mbps
͘Β͍ • VDSL 100Mbps ͘Β͍ • FTTH 1Gbps~ 10Gbps ͷੈքʹ 10
༷ʑͳཧ 4 ޫ௨৴ͷ࣌ 11
͜͜ͰͰ͢ 12
RFC1149ʹ͓͚Δ ཧͳʹ͔ʁ 13 13
RFC1149ͱཧ • ཧ • ॻോʢ໌֬ʹോͱࣔ͞Ε͍ͯͳ͍͕ʣ • ר͖ͰͷΓऔΓ • ཧཧతͳػثٴͼɺػثͲ͓͠ͷΓऔΓΛఆٛ͢Δ 14
https://qiita.com/yoshi389111/items/a7ba3d66bb775bafeb6e
·ͱΊ 15
·ͱΊ • ཧ௨৴ͷߴԽʹ͍ɺ༷ʑʹਐԽ͍ͯ͠Δ • ͜Ε͔ΒਐԽ͍ͯͩ͘͠Ζ͏ • AWSͳͲͷΫϥυαʔϏεཧΛӅṭɺ؆ུԽ͍ͯ͠Δ • ཧͷߏஙίετ͕ͳ͍ԸܙఈΕͳ͍ •
ΫϥυΛΘͳ͍߹ɺαʔόɺωοτϫʔΫػثͳͲΛσʔλ ηϯλʹӡΜͰLANέʔϒϧͰ݁ͳͯ͘ͳΒͳ͍ 16