๐Ÿ’ป CS/๋„คํŠธ์›Œํฌ

    [CS] HTTP๋ž€?
    ๐Ÿ’ป CS/๋„คํŠธ์›Œํฌ

    [CS] HTTP๋ž€?

    HTTP(HyperText Transfer Protocol) ์›น ์ƒ์—์„œ ์ •๋ณด๋ฅผ ์ „์†กํ•˜๊ธฐ ์œ„ํ•œ ํ†ต์‹ ํ”„๋กœํ† ์ฝœ๋กœ์„œ HTML๊ณผ ๊ฐ™์€ ๋ฌธ์„œ๋ฅผ ์ „์†ก ํด๋ผ์ด์–ธํŠธ → ์„œ๋ฒ„ : HTTP request๋ฅผ ๋ณด๋ƒ„ request message๋Š” start line(method, path, HTTP version), headers, body๋กœ ๊ตฌ์„ฑ ์„œ๋ฒ„ → ํด๋ผ์ด์–ธํŠธ : HTTP response๋ฅผ ๋ณด๋ƒ„ response message๋Š” status line(HTTP version, status code, status message), headers, body๋กœ ๊ตฌ์„ฑ TPC/IP ๊ธฐ๋ฐ˜์œผ๋กœ ์ž‘๋™, ํฐ ํŠน์ง•์œผ๋กœ๋Š” Connectionless์™€ Stateless๊ฐ€ ์žˆ๋‹ค. Connectionless : ์„œ๋ฒ„์— ์—ฐ๊ฒฐ ํ›„ ์š”์ฒญ์— ๋Œ€ํ•œ ์‘๋‹ต์„ ๋ฐ›..

    [CS] TCP ํ†ต์‹  : 3-way handshake, 4-way handshake
    ๐Ÿ’ป CS/๋„คํŠธ์›Œํฌ

    [CS] TCP ํ†ต์‹  : 3-way handshake, 4-way handshake

    TCP ํ†ต์‹  Connection setup (tcp ์—ฐ๊ฒฐ ์ดˆ๊ธฐํ™”) : 3-way handshaking Data transfer (๋ฐ์ดํ„ฐ ์ „์†ก) Connection termination (tcp ์—ฐ๊ฒฐ ์ข…๋ฃŒ) : 4-way handshaking 3-way handshake(์—ฐ๊ฒฐ ์‹œ์ž‘) TCP/IP ํ”„๋กœํ† ์ฝœ๋กœ ํ†ต์‹ ํ•˜๊ธฐ ์ „, ์ •ํ™•ํ•œ ์ •๋ณด ์ „์†ก์„ ์œ„ํ•ด ์ƒ๋Œ€๋ฐฉ ์ปดํ“จํ„ฐ์™€ ์„ธ์…˜์„ ์ˆ˜๋ฆฝํ•˜๋Š”(์—ฐ๊ฒฐํ•˜๋Š”) ๊ณผ์ •(TCP ์—ฐ๊ฒฐ ์ดˆ๊ธฐํ™”) ์ด๋ฆ„์กฐ์ฐจ ์•…์ˆ˜๋ผ๋Š” ๋œป, ์ฆ‰ ์„œ๋กœ๋ฅผ ํ™•์ธํ•˜๊ธฐ ์œ„ํ•œ ์ ˆ์ฐจ(connection์„ ์œ„ํ•œ ์ ˆ์ฐจ)๋ผ๊ณ  ์ƒ๊ฐํ•˜๋ฉด ํŽธํ•˜๋‹ค. ํด๋ผ์ด์–ธํŠธ๊ฐ€ ์„œ๋ฒ„์—๊ฒŒ SYNํŒจํ‚ท(์—ฐ๊ฒฐ ์š”์ฒญ)์„ ๋ณด๋ƒ„ ์„œ๋ฒ„๊ฐ€ ํด๋ผ์ด์–ธํŠธ์—๊ฒŒ ACKํŒจํ‚ท(์—ฐ๊ฒฐ ์ธ์ง€) + SYNํŒจํ‚ท(์—ฐ๊ฒฐ ์š”์ฒญ)์„ ๋ณด๋ƒ„ → ์„œ๋ฒ„๋„ ํด๋ผ์ด์–ธํŠธํ•œํ…Œ ์—ฐ๊ฒฐ ์š”์ฒญ ํด๋ผ์ด์–ธํŠธ๊ฐ€ ์„œ๋ฒ„์—๊ฒŒ ..

    [CS] TCP/IP ์ „์†ก ๊ณ„์ธต - TCP์™€ UDP
    ๐Ÿ’ป CS/๋„คํŠธ์›Œํฌ

    [CS] TCP/IP ์ „์†ก ๊ณ„์ธต - TCP์™€ UDP

    TCP/IP ์ „์†ก ๊ณ„์ธต ์ธํ„ฐ๋„ท์—์„œ ์‚ฌ์šฉํ•˜๋Š” ํ”„๋กœํ† ์ฝœ ๊ทธ๋ฃน(4๊ณ„์ธต ํ˜น์€ 5๊ณ„์ธต) Application layer(์‘์šฉ ๊ณ„์ธต) Transport layer(์ „์†ก ๊ณ„์ธต) Internet layer(์ธํ„ฐ๋„ท ๊ณ„์ธต) Data Link layer(๋ฐ์ดํ„ฐ ๋งํฌ ๊ณ„์ธต) Physical layer(๋ฌผ๋ฆฌ ๊ณ„์ธต) ์ด ์ค‘ ์ „์†ก ๊ณ„์ธต์€ ๋‘ ์‘์šฉ ๊ณ„์ธต ์‚ฌ์ด์—์„œ์˜ process to process ํ†ต์‹ ์„ ์ œ๊ณตํ•ฉ๋‹ˆ๋‹ค. ์ „์†ก ๊ณ„์ธต์€ ์‘์šฉ ๊ณ„์ธต์œผ๋กœ๋ถ€ํ„ฐ ๋ฉ”์‹œ์ง€๋ฅผ ๋ฐ›์•„ ํŒจํ‚ท(TCP : segment, UDP : datagram)์œผ๋กœ ์บก์Šํ™”ํ•˜์—ฌ ์ „์†กํ•ฉ๋‹ˆ๋‹ค. TCP(Transmission Control Protocol) ์—ฐ๊ฒฐํ˜•, ์‹ ๋ขฐ์„ฑ ์ „์†ก ํ”„๋กœํ† ์ฝœ ์—ฐ๊ฒฐ์ง€ํ–ฅ์  ์„œ๋น„์Šค๋ฅผ ์ œ๊ณตํ•˜๊ธฐ ์œ„ํ•ด ๋ฐ์ดํ„ฐ ์ „์†ก ์ „ 3-way handshaking์„ ํ•˜์—ฌ ๋‘ ํ˜ธ..

    [CS] OSI 7๊ณ„์ธต๊ณผ TCP/IP 4๊ณ„์ธต
    ๐Ÿ’ป CS/๋„คํŠธ์›Œํฌ

    [CS] OSI 7๊ณ„์ธต๊ณผ TCP/IP 4๊ณ„์ธต

    ๊ณ„์ธต ๋ชจํ˜• ์ธํ„ฐ๋„ท์—์„œ ์ปดํ“จํ„ฐ๋“ค์ด ์„œ๋กœ ์ •๋ณด๋ฅผ ์ฃผ๊ณ ๋ฐ›๋Š”๋ฐ ์“ฐ์ด๋Š” ํ†ต์‹ ๊ทœ์•ฝ(ํ”„๋กœํ† ์ฝœ)์˜ ๋ชจ์Œ์œผ๋กœ, ๊ฐ ๊ณ„์ธต์€ ๋‹ด๋‹นํ•˜๋Š” ์œ„์น˜๋งˆ๋‹ค ์ฒ˜๋ฆฌ ์—ญํ• ์„ ๊ตฌ๋ถ„ํ•ด๋†“์Œ์œผ๋กœ์จ ์„œ๋กœ ๊ฐ„์˜ ๊ฐ„์„ญ์„ ์ตœ์†Œํ™”ํ•˜๊ณ  ์‚ฌ์šฉ์˜ ํŽธ๋ฆฌ์„ฑ์„ ๋†’์ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ํ˜ธํ™˜์„ฑ ๋ณด์žฅ(๋‹ค๋ฅธ ์ œ์กฐ์‚ฌ ์žฅ๋น„๋“ค๋ผ๋ฆฌ๋„ ํ†ต์‹  ๊ฐ€๋Šฅ)์œผ๋กœ ์ธํ•œ ๋น„์šฉ ์ ˆ๊ฐ ์‰ฌ์šด ๋ฌธ์ œ ํ•ด๊ฒฐ(๊ณ„์ธต๋ณ„๋กœ ๋ฌธ์ œ ํ™•์ธ ๊ฐ€๋Šฅ) ๋‹ค๋ฅธ ๊ณ„์ธต๋ผ๋ฆฌ๋Š” ๊ฐ ์ „๋‹ฌ ๊ณผ์ •์„ ์•Œ ํ•„์š”์—†์–ด ๋ฐ์ดํƒ€์˜ ์บก์Šํ™”(ํ—ค๋”์ฒจ๋ถ€)์™€ ์€๋‹‰์ด ๊ฐ€๋Šฅ OSI 7๊ณ„์ธต OSI (Open Systems Interconnection) ๋„คํŠธ์›Œํฌ์—์„œ ํ†ต์‹ ์ด ์ผ์–ด๋‚˜๋Š” ๊ณผ์ •์„ 7๋‹จ๊ณ„๋กœ ๋‚˜๋ˆˆ ๊ฒƒ์„ ๋งํ•ฉ๋‹ˆ๋‹ค. ํ๋ฆ„์„ ํ•œ๋ˆˆ์— ์•Œ์•„๋ณด๊ธฐ ํŽธํ•˜๊ณ , ํ†ต์‹  ๊ณผ์ •์—์„œ ์ด์ƒ์ด ์ƒ๊ฒผ์„ ๋•Œ ๋‹ค๋ฅธ ๊ณ„์ธต์˜ ํ•˜๋“œ์›จ์–ด ๋ฐ ์†Œํ”„ํŠธ์›จ์–ด๋ฅผ ๊ฑด๋“œ๋ฆฌ์ง€ ์•Š๊ณ  ๋ฌธ์ œ๊ฐ€ ์ƒ๊ธด ๊ณ„์ธต๋งŒ ์‚ดํŽด๋ณด๋ฉด ๋˜๊ธฐ ๋•Œ๋ฌธ..

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