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   OSI Reference 7 Layers

http://www.hackerschool.org/HS_Boards/zboard.php?id=Free_Lectures&no=1721 [º¹»ç]


OSI Reference Model
1. 7°èÃþ (Application-ÀÀ¿ë°èÃþ)
(1) »ç¿ëÀÚ¿¡°Ô °¡±î¿î °èÃþ
(2) ÀÀ¿ëÇÁ·Î±×·¥¿¡°Ô ¼­ºñ½º¸¦ Á¦°ø ¹Þ´Â´Ù. (¿¢¼¿, ÇѱÛ, ºê¶ó¿ìÀú µî)
   - ³×Æ®¿öÅ©¸¦ ÀÌ¿ëÇÏ·Á´Â ÇÁ·Î±×·¥°ú »ç¿ëÀÚ¿¡°Ô ¼­ºñ½º¸¦ Á¦°øÇÑ´Ù.
(3) Data¸¦ »ý¼ºÇÏ´Â °÷ÀÌ´Ù.
   - »ç¿ëÀÚ°¡ ÇÁ·Î±×·¥À» ÀÌ¿ëÇØ Data¸¦ ¸¸µé¸é 7°èÃþ¿¡¼­´Â ÀÌ Data¸¦ ¹Þ¾Æ¼­
     ÄÄÇ»ÅÍ°¡ ¾Ë¾Æº¼ ¼ö ÀÖ´Â 0°ú 1·Î Data¸¦ »ý¼º ÇÑ´Ù.

2. 6°èÃþ (Presentation-Ç¥Çö°èÃþ)
(1) 7°èÃþ¿¡¼­ ¹ÞÀº Data¸¦ Ç¥ÇöÇÏ´Â °÷ÀÌ´Ù.
(2) 0°ú 1·Î¸¸ ÀÌ·ç¾îÁø Data¸¦ ¾îµðºÎÅÍ ¾îµð±îÁö°¡ ±ÛÀÚÀÌ°í ±×¸²ÀÎÁö¸¦ Ç¥ÇöÇØÁØ´Ù.
   - ÆÄÀÏ µÚ¿¡ È®ÀåÀÚ°¡ ºÙ´Â °Í°ú °°´Ù. (*.TXT, *.JPG, *.AVI µî)
(3) º¸³»´Â ÂÊÀÇ ÀÀ¿ë°èÃþ¿¡¼­ ¹ÞÀº Á¤º¸¸¦ ¹ÞÀº ÂÊÀÇ ÀÀ¿ë°èÃþÀÌ ÀÐÀ» ¼ö ÀÖ°Ô ÇØÁØ´Ù.
(4) ¾ÐÃà ¶Ç´Â ÇØÁ¦ÇÏ´Â ÀÏ°ú ¾Ïȣȭ¿Í º¹È£È­¸¦ ÇÑ´Ù.

3. 5°èÃþ (Session-¿¬°á°èÃþ)
(1) ¼­·ÎÀÇ ÀÀ¿ëÇÁ·Î±×·¥À» ¿¬°áÇØÁÖ°í ¼³Á¤, °ü¸®, Á¾·áÇÏ´Â ÀÏÀ» ÇÑ´Ù.

¡Ø 5°èÃþ ~ 7°èÃþÀ» »óÀ§°èÃþÀ̶ó°í ÇÑ´Ù.
(1) PDU : Data »ç¿ë
   - PDU (Protocol Data Unit) = °¢ °èÃþ¿¡¼­ »ç¿ëÇÏ´Â Data ´ÜÀ§
(2) Àåºñ : PC »ç¿ë
(3) Protocol : HTTP, FTP, TELNET, DNS, SSH, DHCP, SMTP, POP3 µîÀÌ ÀÖ´Ù.

¡Ø 1°èÃþ ~ 4°èÃþÀ» ÇÏÀ§°èÃþÀ̶ó°í ÇÑ´Ù.

4. 4°èÃþ (Transport-Àü¼Û°èÃþ)
(1) »óÀ§°èÃþÀÇ ¼­ºñ½º(Protocol)À» ±¸ºÐÇÑ´Ù. À̶§ PORT ÁÖ¼Ò¸¦ »ç¿ëÇؼ­ ¼­ºñ½º¸¦ ±¸ºÐÇÑ´Ù.
(2) Data¸¦ ¾ÈÀüÇÏ°Ô º¸³¾Áö, ¾ÈÀüÇÏÁö ¾Ê°Ô º¸³¾Áö Á¤ÇÑ ÈÄ Àü¼ÛÇÑ´Ù. (DataÇ°Áú)
(3) Data¸¦ ³ª´©°í, ³ª´©¾îÁø Data¸¦ Á¶¸³ÇÏ´Â ÀÏÀ» ÇÑ´Ù.
(4) PDU : Segment
(5) Àåºñ :¡¡L4 Switch
(6) Protocol : TCP(¾ÈÀüÇÏ°Ô º¸³»´Â °Í), UDP(¾ÈÀüÇÏÁö ¾Ê°Ô º¸³»´Â °Í)

5. 3°èÃþ (Network-³×Æ®¿öÅ©°èÃþ)
(1) ¹°¸®ÀûÀÎ À§Ä¡¿¡ °ü°è¾øÀÌ Àåºñ¸¦ ½Äº°Çϱâ À§ÇÑ ³í¸®Àû ÁÖ¼Ò¸¦ »ç¿ëÇÑ´Ù. (=IPÁÖ¼Ò)
   - IPÁÖ¼Ò´Â À¯ÀÏÇÑ ÁÖ¼ÒÀÌ´Ù. (¼­·Î °°À» ¼ö´Â ¾ø´Ù)
(2) ÃÖÁ¾ ¸ñÀûÁö ÆľÇÇÏ°í °æ·Î¸¦ °áÁ¤ÇÏ´Â ÀÏÀ» ÇÑ´Ù.
(3) 2°èÃþ Å©±â¿¡ ¸Â°Ô Data¸¦ ³ª´«´Ù.
(4) PDU : Packet
(5) Àåºñ : Router, L3 Switch
(6) Protocol : IP, ARP, RARP, ICMP, IGMP

6. 2°èÃþ (Data Link-¸µÅ©°èÃþ)
(1) Data¸¦ ƯÁ¤ Àåºñ·Î º¸³¾ ¼ö ÀÖµµ·Ï ÁÖ¼Ò¸¦ »ç¿ëÇÑ´Ù. (=MACÁÖ¼Ò)
(2) Data¿¡ ¿À·ù°¡ ÀÖ´ÂÁö °Ë»çÇÑ´Ù.
(3) MACÁÖ¼Ò·Î Àåºñ¸¦ ±¸ºÐÇؼ­ Data¸¦ º¸³½´Ù.
(4) PDU : Frame
(5) Àåºñ : L2 Switch, Bridge
(6) Protocol
   - LAN = Ethernet, Token-ring, FDDI
   - WAN = SLIP, PPP, Frame-relay, HDLC

7. 1°èÃþ (Physical-¹°¸®°èÃþ)
(1) Data¸¦ Àü±âÀûÀÎ ½ÅÈ£·Î º¯È¯ÇÑ ÈÄ ¼±À» ÅëÇØ Data¸¦ º¸³»°Å³ª ¹Þ´Â ÀÏÀ» ÇÑ´Ù.
(2) PDU : bit
(3) Àåºñ : Hub, Repeater, Cable, Connector

  Hit : 5474     Date : 2011/04/17 11:08



    
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