{"id":1800,"date":"2013-02-18T12:32:17","date_gmt":"2013-02-18T03:32:17","guid":{"rendered":"http:\/\/apollo89.com\/wordpress\/?p=1800"},"modified":"2013-02-18T12:32:17","modified_gmt":"2013-02-18T03:32:17","slug":"l2-l3-l4-l7-%ec%8a%a4%ec%9c%84%ec%b9%98","status":"publish","type":"post","link":"https:\/\/apollo89.com\/wordpress\/?p=1800","title":{"rendered":"L2, L3, L4, L7 \uc2a4\uc704\uce58"},"content":{"rendered":"

 <\/p>\n

L2, L3, L4, L7 \uc2a4\uc704\uce58<\/p>\n

L2, L3 \ub4f1\uc740 OSI\uc758 7 \ub808\uc774\uc5b4 \uc911 \uc5b4\ub5a4 \ub808\uc774\uc5b4\uc5d0\uc11c \uc218\ud589\ub418\ub294\uac00\uc5d0 \ub530\ub77c \uc815\uc758\ub41c \ubd84\ub958<\/p>\n

L2 Switch (Mac Address)
\n\uac00\uc7a5 \uc6d0\ucd08\uc801\uc778 \ud615\ud0dc\uc758 \uc2a4\uc704\uce58\ub294 L2 \uc2a4\uc704\uce58\uc774\ub2e4.
\n\uc6d0\ub798 \uc2a4\uc704\uce58\uc758 \uc815\uc758\uc5d0 \uac00\uc7a5 \ubd80\ud569\ud558\ub294 \uac83\uc774 L2 \uc2a4\uc704\uce58\uc774\ubbc0\ub85c L2 \ub97c \uadf8\ub0e5 \uc2a4\uc704\uce58\ub77c\uace0 \ubd80\ub974\uae30\ub3c4 \ud55c\ub2e4.
\n\uc2a4\uc704\uce58\ub294 \ud5c8\ube0c\uc5d0\uc11c \ud55c\ub2e8\uacc4 \uc9c4\ud654\ud55c \uac83\uc77c \ubfd0\uc73c\ub85c(\ud5c8\ube0c\uc640 \uc2a4\uc704\uce58\uac00 \ubb34\uc5c7\uc778\uc9c0 \ubcf4\ub824\uba74 \uc5ec\uae30\ub85c), \ud328\ud0b7\uc774 \uc654\uc744\ub54c \uadf8\uac83\uc758 \ubaa9\uc801\uc9c0\uac00 \uc5b4\ub514\uc778\uac00\ub97c \ubcf4\uace0 \uadf8 \ubaa9\uc801\uc9c0\ub85c \ubcf4\ub0b4\uc8fc\ub294 \uc5ed\ud560\ub9cc\uc744 \ud55c\ub2e4. \ub9d0 \uadf8\ub300\ub85c ‘\uc2a4\uc704\uce58’\uc77c \ubfd0\uc774\ub2e4.
\n\uc774\ub294 \ub808\ubca8 2\uc5d0\uc11c \ub3d9\uc791\ud558\ubbc0\ub85c \ubaa9\uc801\uc9c0\ub294 Ethernet \uc8fc\uc18c\ub85c \uc774\ud574\ud55c\ub2e4.
\n\uc989 IP \uc8fc\uc18c\uac00 \ud544\uc694\ud55c \uc678\ubd80\ub85c \ubcf4\ub0b4\uc904 \uc218 \uc5c6\ub2e4. <\/p>\n

L2 Switch \uc758 \ud55c\uacc4
\nOSI 7 layers \uc5d0\uc11c 2 \ub808\ubca8\uc740 data link \ub808\uc774\uc5b4\uc774\ubbc0\ub85c, L2 \uc2a4\uc704\uce58\ub294 Ethernet \ub808\ubca8\uc5d0\uc11c \ub3d9\uc791\ud560 \ubfd0 \uadf8 \uc0c1\uc704 \ub808\uc774\uc5b4\uc778 \ub124\ud2b8\uc6cc\ud06c \ub808\uc774\uc5b4\uc5d0\uc11c \ub3d9\uc791\ud558\ub294 IP \ub4f1\uc744 \uc774\ud574\ud558\uc9c0 \ubabb\ud55c\ub2e4.
\n\ub2e4\uc2dc\ub9d0\ud574 IP \uc5b4\ub4dc\ub808\uc2a4\ub97c \uc774\ud574\ud558\uc9c0 \ubabb\ud558\ubbc0\ub85c \ub77c\uc6b0\ud305\uc774 \ubd88\uac00\ub2a5\ud558\ub2e4 (Route \ub77c\ub294 \uac83\uc774 \uc678\ubd80\uc640 \uc5f0\uacb0\ub418\ubbc0\ub85c IP \uc5b4\ub4dc\ub808\uc2a4\ub97c \uc54c\uc544\uc57c \ud568\uc744 \uae30\uc5b5\ud558\uba74 \uc774\ub294 \ub2f9\uc5f0)<\/p>\n

L3 Switch (IP Address)
\nL3 \uc5d0\uc11c\ub294 3 \ub808\uc774\uc5b4\uc758 \ud504\ub85c\ud1a0\ucf5c\uc778 IP \ub4f1\uc5d0\uc11c \uc2a4\uc704\uce6d\uc744 \uc218\ud589\ud558\ubbc0\ub85c \uc790\uc2e0\uc5d0\uac8c \uc628 \ud328\ud0b7\uc758 destination \uc774 \uc678\ubd80\uc5d0 \uc874\uc7ac\ud558\ub294 IP \uc77c \uacbd\uc6b0 \uadf8 \ud328\ud0b7\uc744 \uc678\ubd80\uc5d0 \uc5f0\uacb0\ub41c \ub77c\uc6b0\ud130\ub85c \ubcf4\ub0b4\uc904 \uc218 \uc788\ub2e4.
\n\uc989 L3 \uc2a4\uc704\uce58\ub294 \ub77c\uc6b0\ud130 \uae30\ub2a5\ub3c4 \uac16\uace0 \uc788\uae30 \ub54c\ubb38\uc5d0 \ub77c\uc6b0\ud130\uc640\uc758 \uacbd\uacc4\uac00 \ubaa8\ud638\ud574\uc9c4\ub2e4.<\/p>\n

L4 Switch (TCP Port 80)
\nL4 \uc5d0\uc11c\ub294 4 \ub808\uc774\uc5b4\uc758 \ud504\ub85c\ud1a0\ucf5c\uc778 TCP\/UDP \ub4f1\uc5d0\uc11c \uc2a4\uc704\uce6d\uc744 \uc218\ud589\ud558\ubbc0\ub85c TCP\uc640 UDP \ub4f1\uc758 \ud5e4\ub354\ub97c \ubcf4\uace0 \uadf8\uac83\uc774 FTP \uc778\uac00 HTTP \uc778\uac00 SMTP \uc778\uac00\ub97c \ubcf4\uace0 \uc5b4\ub5a4 \uac83\uc744 \uc6b0\uc120\uc2dc\ud574\uc11c \uc2a4\uc704\uce6d\ud560\uc9c0 \ud310\ub2e8\ud560 \uc218 \uc788\ub2e4.
\n\uc989 \ub85c\ub4dc \ubc38\ub7f0\uc2f1\uc774 \uac00\ub2a5\ud574\uc9c4\ub2e4\ub294 \uc598\uae30\uc778\ub370 \uc774\ub294 L3 \uc774\ud558\uc5d0\uc11c\ub294 \ubd88\uac00\ub2a5\ud55c \uac83\uc774\ub2e4. <\/p>\n

L7 Switch (Pack \ub0b4\uc6a9 => “GET\/image\/xxx.jpg HTTP\/1.1”)
\nL7 \uc2a4\uc704\uce58\ub294 OSI \uc758 7 \ub808\uc774\uc5b4 \uc989 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158 \ub808\uc774\uc5b4\uc5d0\uc11c \ub3d9\uc791\ud558\ub294 \uac83\uc73c\ub85c \uc774\ub97c\ud14c\uba74 \uc774\uba54\uc77c\uc758 \uc81c\ubaa9\uc774\ub098 \ubb38\uc790\uc5f4\uc744 \ubcf4\uace0 \ub0b4\uc6a9\uc744 \ud30c\uc545\ud55c\ub2e4\uac70\ub098 HTTP \uc758 URL, \ub610\ub294 FTP\uc758 \ud30c\uc77c\uba85, \ucfe0\ud0a4 \uc815\ubcf4, \ud2b9\uc815 \ubc14\uc774\ub7ec\uc2a4\uc758 \ud328\ud134 \ub4f1\uc744 \ubd84\uc11d\ud574\uc11c \ubcf4\uc548\uc5d0 \ub354\uc6b1 \uc720\ub9ac\ud558\uace0 \ub354\uc6b1 \uc815\uad50\ud55c \ub85c\ub4dc \ubc38\ub7f0\uc2f1\uc774 \uac00\ub2a5\ud574\uc9c4\ub2e4.
\n\uc0ac\uc2e4 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158 \ub808\ubca8\uc758 \ub370\uc774\ud130\ub97c \ub2e4 \ub2e4\ub8ec\ub2e4\ub294 \uac83\uc740 \ubd88\uac00\ub2a5\ud558\uace0 L7 \uc2a4\uc704\uce58\ub294 \ub2e8\uc9c0 \ud328\ud0b7\uc758 \ub0b4\uc6a9\uc744 \uc870\uae08 \ub354 \ucc38\uc870\ud558\uc5ec \uc57d\uac04 intelligent \ud55c \uacb0\uc815\uc744 \ub0b4\ub9b4 \uc218 \uc788\uac8c \ub41c \uac83 \ubfd0\uc774\ub2e4.
\n\uc27d\uac8c\ub9d0\ud574 L7 \uc2a4\uc704\uce58\ub77c\ub294 \uac83\uc740 \ub9c8\ucf00\ud305\uc6a9\uc5b4\ub77c\uace0 \ubcfc \uc218 \uc788\ub2e4.<\/p>\n

L4 Switch\uc640 L7 Switch\uc758 \uacf5\ud1b5\uc810
\n\uc2a4\uc704\uce58\ub85c \ub4e4\uc5b4\uc628 Packet\uc744 \uc801\uc808\ud55c \ubaa9\uc801\uc9c0(\uc8fc\ub85c \ub124\ud2b8\uc6cc\ud06c \uc7a5\ube44\ub098 \ud074\ub77c\uc774\uc5b8\ud2b8, \ub54c\ub85c\ub294 \ubd88\ud544\uc694\ud55c Packet\uc744 Drop\uc2dc\ud0a4\uae30\ub3c4 \ud568)\ub85c \uc804\uc1a1\ud574\uc90c.
\n\uae30\ubcf8\uc801\uc778 \uae30\ub2a5\uacfc \uc5ed\ud560\uc740 \ub3d9\uc77c\ud558\ub098 Packet\uc744 \ubd84\uc11d\ud574 \uc131\uaca9\uacfc \uc911\uc694\ub3c4\ub97c \ubd84\ub958\ud558\ub294 Intelligence\uac00 \ub2ec\ub77c\uc11c “\uc801\uc808\ud55c \ubaa9\uc801\uc9c0”\ub97c \ucc3e\uc544\ub0b4 \ud574\ub2f9 Packet\uc744 \ucc98\ub9ac\ud574 \uc8fc\ub294 \ub2a5\ub825\uc5d0 \ucc28\uc774\uac00 \ubc1c\uc0dd\ud568.<\/p>\n

L4 Switch\uc640 L7 Switch\uc758 \ucc28\uc774\uc810<\/p>\n

1. \uad6c\uc870\uc801 \ucc28\uc774\uc810 – Intellingence
\nL4 Switch : TCP\/UDP \ud3ec\ud2b8 \uc815\ubcf4\ub97c \ubd84\uc11d\ud574 \ud574\ub2f9 \ud328\ud0b7\uc774 \ud604\uc7ac \uc0ac\uc6a9\ud558\ub294 \uc11c\ube44\uc2a4 \uc885\ub958(HTTP, FTP, \ud154\ub137, SMTP, POP3, SSL\ub4f1)\ubcc4\ub85c PACKET\uc744 \ucc98\ub9ac
\nL7 Switch : \ud2b8\ub798\ud53d\uc758 \ub0b4\uc6a9(e-mail\uc81c\ubaa9\/\ub0b4\uc6a9\uc758 \ubb38\uc790\uc5f4, HTTP\ucee8\ud150\uce20URL, FTP\ud30c\uc77c \uc81c\ubaa9, SSL ID, Cookie \uc815\ubcf4, \ud2b9\uc815 \ubc14\uc774\ub7ec\uc2a4(e.g. CodeRed, Nimda)\ud328\ud134\ub4f1\uc744 \ubd84\uc11d\ud574 Packet\uc744 \ucc98\ub9ac<\/p>\n

2. \uae30\ub2a5\uc801 \ucc28\uc774\uc810
\n* \ubcf4\ub2e4 \ub192\uc740 \uc218\uc900\uc758 Intelligence\ub97c \uac16\ucd98 \uc2a4\uc704\uce58\uc77c\uc218\ub85d \ub354 \uc815\uad50\ud55c \ud328\ud0b7\uc758 \ubd80\ud558\ubd84\uc0b0(Load Ballancing)\ubc0f Qos\uae30\ub2a5 \uad6c\ud604\uc774 \uac00\ub2a5\ud568.
\n* L7\uc2a4\uc704\uce58\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uae30\ub2a5\uc744 \ud1b5\ud574 \ub124\ud2b8\uc6cc\ud06c \uc2dc\uc2a4\ud15c\uc758 \ubcf4\uc548\uc131 \uac15\ud654\uac00 \uac00\ub2a5\ud568.
\n1) Dos\/SYN Attack\uc5d0 \ub300\ud55c \ubc29\uc5b4
\n2) CodeRed\/Nimda\ub4f1 \ubc14\uc774\ub7ec\uc2a4 \uac10\uc5fc \ud328\ud0b7\uc758 \ud544\ud130\ub9c1
\n3) \ub124\ud2b8\uc6cc\ud06c \uc790\uc6d0\uc758 \ub3c5\uc810 \ubc29\uc9c0\ub97c \ud1b5\ud55c \ub124\ud2b8\uc6cc\ud06c \uc2dc\uc2a4\ud15c\uc758 \ubcf4\uc548\uc131 \uac15\ud654\uac00 \uac00\ub2a5\ud568.<\/p>\n

\ubd80\uc5f0 :
\n\uc0c1\uc704 \ub808\ubca8\uc5d0\uc11c \ub3d9\uc791\ud558\ub294 \uc2a4\uc704\uce58\ub294 \uc790\uc2e0\uc758 \ud558\uc704 \ub808\ubca8 \uc2a4\uc704\uce58\uc758 \uae30\ub2a5\uc744 \ub2e4 \uac16\uace0 \uc788\ub2e4.
\n\uc608\ub97c \ub4e4\uc5b4 L4 \uc2a4\uc704\uce58\ub294 L3, L2 \uc2a4\uc704\uce58\uc758 \uae30\ub2a5\ub3c4 \ub2e4 \uc218\ud589\ud560 \uc218 \uc788\ub2e4.<\/p>\n

\ucc38\uace0
\nhttp:\/\/pc-to-mac-changer.blogspot.kr\/2011\/04\/l2-l3-l4-l7.html<\/a>
\nhttp:\/\/blog.naver.com\/snowcall?Redirect=Log&logNo=100004142332<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

  L2, L3, L4, L7 \uc2a4\uc704\uce58 L2, L3 \ub4f1\uc740 OSI\uc758 7 \ub808\uc774\uc5b4 \uc911 \uc5b4\ub5a4 \ub808\uc774\uc5b4\uc5d0\uc11c \uc218\ud589\ub418\ub294\uac00\uc5d0 \ub530\ub77c \uc815\uc758\ub41c \ubd84\ub958 L2 Switch (Mac Address) \uac00\uc7a5 \uc6d0\ucd08\uc801\uc778 \ud615\ud0dc\uc758 \uc2a4\uc704\uce58\ub294 L2 \uc2a4\uc704\uce58\uc774\ub2e4. \uc6d0\ub798 \uc2a4\uc704\uce58\uc758 \uc815\uc758\uc5d0 \uac00\uc7a5 \ubd80\ud569\ud558\ub294 \uac83\uc774 L2 \uc2a4\uc704\uce58\uc774\ubbc0\ub85c L2 \ub97c \uadf8\ub0e5 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[527],"tags":[1051,1052,1053,1054],"class_list":["post-1800","post","type-post","status-publish","format-standard","hentry","category-network","tag-l2-switch","tag-l3-switch","tag-l4-switch","tag-l7-switch"],"yoast_head":"\nL2, L3, L4, L7 \uc2a4\uc704\uce58 - Apollo89.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/apollo89.com\/wordpress\/?p=1800\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L2, L3, L4, L7 \uc2a4\uc704\uce58 - Apollo89.com\" \/>\n<meta property=\"og:description\" content=\"  L2, L3, L4, L7 \uc2a4\uc704\uce58 L2, L3 \ub4f1\uc740 OSI\uc758 7 \ub808\uc774\uc5b4 \uc911 \uc5b4\ub5a4 \ub808\uc774\uc5b4\uc5d0\uc11c \uc218\ud589\ub418\ub294\uac00\uc5d0 \ub530\ub77c \uc815\uc758\ub41c \ubd84\ub958 L2 Switch (Mac Address) \uac00\uc7a5 \uc6d0\ucd08\uc801\uc778 \ud615\ud0dc\uc758 \uc2a4\uc704\uce58\ub294 L2 \uc2a4\uc704\uce58\uc774\ub2e4. \uc6d0\ub798 \uc2a4\uc704\uce58\uc758 \uc815\uc758\uc5d0 \uac00\uc7a5 \ubd80\ud569\ud558\ub294 \uac83\uc774 L2 \uc2a4\uc704\uce58\uc774\ubbc0\ub85c L2 \ub97c \uadf8\ub0e5 … Continue reading →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/apollo89.com\/wordpress\/?p=1800\" \/>\n<meta property=\"og:site_name\" content=\"Apollo89.com\" \/>\n<meta property=\"article:published_time\" content=\"2013-02-18T03:32:17+00:00\" \/>\n<meta name=\"author\" content=\"apollo89\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" \/>\n\t<meta name=\"twitter:data1\" content=\"apollo89\" \/>\n\t<meta name=\"twitter:label2\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=1800#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=1800\"},\"author\":{\"name\":\"apollo89\",\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/#\\\/schema\\\/person\\\/93f56825cac3b2f18e5f107995066c82\"},\"headline\":\"L2, L3, L4, L7 \uc2a4\uc704\uce58\",\"datePublished\":\"2013-02-18T03:32:17+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=1800\"},\"wordCount\":142,\"commentCount\":0,\"keywords\":[\"L2 Switch\",\"L3 Switch\",\"L4 Switch\",\"L7 Switch\"],\"articleSection\":[\"Network\"],\"inLanguage\":\"ko-KR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=1800#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=1800\",\"url\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=1800\",\"name\":\"L2, L3, L4, L7 \uc2a4\uc704\uce58 - 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