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5. °í±Þ±â´É
Á¶È¸ : 7,913  



5.°í±Þ ±â´É

5.1. DNS Notify

5.2. Dynamic Update
5.3. ¹Ì·¯¸µ ¼­¹ö°£ÀÇ ºÎÇÏ °øÀ¯

5.1. DNS Notify

Âü°í: RFC1996

BIND-8 ºÎÅÍ Áö¿øÇÏ´Â DNS Notify±â´ÉÀº PrimaryÀÇ Zone µ¥ÀÌÅͺ£À̽º°¡ ¼öÁ¤µÇ¾úÀ½À» ÇØ´ç ZoneÀÇ Authority¸¦ °®´Â Secondary ¼­¹ö·Î ¾Ë·ÁÁÖ¾î Primary¿Í Secondary ³×ÀÓ¼­¹öÀÇ µ¿Àû µ¿±âÈ­¸¦ °¡´ÉÄÉ ÇÑ´Ù.

BIND-4³ª BIND-8¿¡¼­ º» ¿É¼ÇÀ» »ç¿ëÇÏÁö ¾ÊÀ¸¸é ZoneÀÇ SOA ¿µ¿ª¿¡ ¸í½ÃµÈ Refresh¸¦ ÁÖ±â·Î Secondary°¡ PrimaryÀÇ Serial Áõ°¡¸¦ üũÇÏ¿© Zone Transfer ÇÏ´Â ÇüÅÂÀ̳ª. BIND-8ÀÇ DNS Notify¸¦ »ç¿ëÇϸé ÇÏ¿© µµ¸ÞÀÎ ¼öÁ¤ º¯°æ¿¡ µû¸¥ ÀüÆÄ½Ã°£ (Maximum Propagation Delay)À» ÃÖ¼ÒÈ­ ÇØÁØ´Ù.

PrimaryÀÇ ZoneÀÌ ¾÷µ¥ÀÌÆ® µÇ¸é BIND´Â ÇØ´ç ZoneÀÇ NS ·¹Äڵ带 ºÐ¼®ÇÏ¿© ÀÚ½ÅÀ» Á¦¿ÜÇÑ ³ª¸ÓÁö ³×ÀÓ¼­¹ö¿¡ ZoneÀÌ ¾÷µ¥ÀÌÆ® µÇ¾úÀ½À» ¾Ë¸®´Â Notify ½ÅÈ£¸¦ º¸³»°í, Secondary´Â Primary ZoneÀÇ SerialÀÌ Áõ°¡ÇÏ¿´À½À» È®ÀÎÇÑÈÄ Zone transfer¸¦ ÅëÇØ ÇØ´ç ZoneÀ» ¾÷µ¥ÀÌÆ®ÇÑ´Ù. ¸¸¾à Secondary°¡ DNS Notify¸¦ Áö¿øÇÏÁö ¸øÇÑ´Ù¸é "Not Implemented" ÀÀ´ä°ú ÇÔ²² ÇØ´ç ¿äûÀ» ¹«½ÃÇÑ´Ù.

Figure 5-1. Maximum Propagation Delay

Maximum Propagation Delay

[Å« ±×¸² º¸±â]

BIND-8´Â ±âº»ÀûÀ¸·Î DNS Notify°¡ ÄÑÁ®ÀÖ´Ù. µû¶ó¼­ ´ÙÀ½°ú °°Àº ¼³Á¤À»À» ÅëÇØ Àüü ȤÀº ƯÁ¤ Zone¿¡ ´ëÇØ¼­ DNS-Notify¸¦ Àû¿ëÄ¡ ¾ÊÀ» ¼ö ÀÖ´Ù.

    options {
        notify no;  // Àüü¿¡ ´ëÇØ¼­ ±â´ÉÀ» ²ö´Ù. (µðÆúÆ® yes)
    }
    
    zone "freebsd.org" {
        type master;
        file "zone-freebsd.org"
        notify no;          // ÇØ´ç µµ¸ÞÀο¡ ´ëÇØ¼­¸¸ ±â´ÉÀ» ²ö´Ù.
    };
    
    zone "freebsd.org" {
        type master;
        file "zone-freebsd.org"
        notify yes;         // ÇØ´ç µµ¸ÞÀο¡ ´ëÇØ¼­¸¸ ±â´ÉÀ» ÄÒ´Ù.
    };

Authority¸¦ °®Áö ¾Ê´Â ³×ÀÓ¼­¹ö¿¡ Notify ¸®½ºÆ®¿¡ Æ÷ÇÔÇϰíÀÚ ÇÒ °æ¿ì¿£ also-notify ¿É¼ÇÀ» »ç¿ëÇÑ´Ù.

    zone "freebsd.org" {
        type master;
        file "zone-freebsd.org"
        notify yes;
        also-notify {210.124.149.130;};
    };

RFC1996¿¡ µû¸£¸é DNS Notify ¿äûÀ» ¹ÞÀº Secondary ³×ÀÓ¼­¹ö´Â ÇØ´ç µµ¸ÞÀÎÀÇ Authority¸¦ °®´Â ´Ù¸¥ ³×ÀÓ¼­¹ö¿¡°Ô ´Ù½Ã DNS Notify ½ÅÈ£¸¦ º¸³»¾ß Çϴµ¥ ½ÇÁ¦ BIND-8 ±¸Çö¿¡¼­´Â Æ÷ÇÔµÇÁö ¾Ê¾ÒÀ½À» Âü°íÇϱ⠹ٶõ´Ù. ÀÌ ±â´ÉÀº ³×Æ®¿öÅ© ÅäÆú·ÎÁö»ó Secondary°¡ Primary¿¡ ¹Ù·Î Á¢¼ÓÄ¡ ¸øÇÏ°í ´Ù¸¥ Secondary¸¦ ¸¶½ºÅÍ·Î ¼³Á¤ÇÏ´Â °æ¿ì¸¦ ´ëºñÇØ ±ÔÁ¤µÇ¾úÀ¸³ª, ½Ç¿ëÀûÀ¸·Î ÀÌ·¯ÇÑ °æ¿ì°¡ ¸Å¿ì µå¹°°í ¹Ù¶÷Á÷ÇÏÁö ¾ÊÀº ±¸¼º(Maximum Propagation Delay Áõ°¡)À̱⿡ BIND-8¿¡ °°ÀÌ ±¸ÇöµÇÁö ¾ÊÀºµí ½Í´Ù.

5.2. Dynamic Update

Âü°í: RFC2136

BIND-8 ºÎÅÍ Áö¿øµÇ´Â Dynamic Update´Â ÇØ´ç µµ¸ÞÀÎÀÇ Authority¸¦ °®´Â ³×ÀÓ¼­¹ö¸¦ ÅëÇØ Zone ÆÄÀÏÀ» ¼öÁ¤Ä¡ ¾Ê°íµµ ·¹Äڵ带 µ¿ÀûÀ¸·Î ¿ø°Ý °»½ÅÇÒ ¼ö ÀÖµµ·Ï ÇÑ´Ù. µµ¸ÞÀÎ °ü¸®¸¦ ÀÚµ¿È­ Çϰųª, »ç¿ëÀÚº°·Î Á¢¼Ó µµ¸ÞÀÎÀ» ½Ç½Ã°£ º¯°æÇÏ¿© Á¦°øÇϰųª, DHCP¿¡¼­ÀÇ ÁÖ¼Ò-IP ¸Åεî°ú °°ÀÌ ½Ç½Ã°£ ÀûÀ¸·Î ·¹Äڵ尡 º¯°æ, °»½Å µÉ Çʿ䰡 ÀÖ´Â ¼­ºñ½º¿¡ ƯÈ÷ À¯¿ëÇÒ ¼ö ÀÖ°Ú´Ù.

Dynamic Update´Â º¸¾ÈÀ» ÀÌÀ¯·Î ±âº»ÀûÀ¸·Î ±â´ÉÀÌ ²¨Á®Àֱ⠶§¹®¿¡ Çã¿ëÇÒ µµ¸ÞÀο¡ ´ëÇØ allow-update ¿É¼ÇÀ» Ãß°¡ÇØ¾ß ÇÑ´Ù.

    zone "freebsd.org" {
        type master;
        file "zone-freebsd.org";
        allow-update { 210.124.149.130; };
    }

Dynamic Update´Â BIND ¹èÆ÷ÆÇ¿¡ Æ÷ÇԵǾî ÀÖ´Â nsupdate µµ±¸¸¦ »ç¿ëÇÏ¿© ¸í·ÉÇà(non-interactive) ȤÀº ´ëÈ­Çü(interactive)À¸·Î Á¶ÀÛÀÌ °¡´ÉÇÏ´Ù. ´ëÈ­Çü ¸ðµå¿¡¼­ ÁÖ¾îÁø ¸í·É¹®Àº ¹­À½(Á¶°Ç¹®°ú ¸í·É¹®)À¸·Î ½ÇÇàÀÌ °¡´ÉÇϱ⠶§¹®¿¡ ÀÔ·ÂÇÑ ¸í·É¹®(µé)Àº °ø¹é ¶óÀο¡¼­ ¿£Å͸¦ Çѹø ´õ ÀÔ·ÂÇÏ¿©¾ß ÇÑ´Ù. ¸í·ÉÇà ¸ðµå´Â ¸í·É¹®À» ÁÖ¾îÁø ÆÄÀÏÀ̳ª stdin ¿¡¼­ ÀԷ¹޴´Ù. ´ÙÀ½Àº nsupdate¿¡¼­ »ç¿ë°¡´ÉÇÑ ¸í·É¹®ÀÌ´Ù.

prereq yxdomain DOMAIN-NAME

DOMAIN-NAMEÀÌ Á¸Àç(ÇϳªÀÌ»óÀÇ ·¹Äڵ尡 ¼³Á¤µÇ¾î ÀÖÀ½)ÇÔÀ» ¿¬¼ÓµÈ ¸í·ÉÀÇ ¼±Çà Á¶°ÇÀ¸·Î »ï´Â´Ù.

prereq nxdomain DOMAIN-NAME

DOMAIN-NAME¿¡ ¾î¶°ÇÑ ·¹Äڵ嵵 ¼³Á¤µÇ¾î ÀÖÁö ¾ÊÀ½À» ¿¬¼ÓµÈ ¸í·ÉÀÇ ¼±Çà Á¶°ÇÀ¸·Î »ï´Â´Ù.

prereq yxrrset DOMAIN-NAME [CLASS] TYPE [DATA]

DOMAIN-NAME¿¡ ÇØ´ç ·¹Äڵ尡 Á¸ÀçÇÔÀ» ¿¬¼ÓµÈ ¸í·ÉÀÇ ¼±Çà Á¶°ÇÀ¸·Î »ï´Â´Ù. DATA°¡ ¸í½ÃµÇ¾î ÀÖÀ» °æ¿ì¿¡´Â Á¤È®ÇÏ°Ô ¸ÅĪÀÌ µÇ´Â °æ¿ì¿¡¸¸ Á¶°ÇÀÌ ¼º¸³µÈ´Ù.

prereq nxrrset DOMAIN-NAME [CLASS] TYPE

DOMAIN-NAME¿¡ ÇØ´ç ·¹Äڵ尡 Á¸ÀçÇÏÁö ¾ÊÀ½À» ¿¬¼ÓµÈ ¸í·ÉÀÇ ¼±Çà Á¶°ÇÀ¸·Î »ï´Â´Ù.

update delete DOMAIN-NAME [CLASS] [TYPE [DATA...]]

TYPEÀÌ ¸í½ÃµÇÁö ¾Ê¾ÒÀ» °æ¿ì¿£ ÇØ´ç DOMAIN-NAME¿¡ ¼Ò¼ÓµÈ ·¹Äڵ带 ¸ðµÎ »èÁ¦ÇÑ´Ù. TYPEÀÌ ¸í½ÃµÉ °æ¿ì¿£ ¸ÅĪµÇ´Â ·¹Äڵ常ÀÌ Á¦°ÅµÈ´Ù.

update add DOMAIN-NAME TTL [CLASS] TYPE DATA...

ÁöÁ¤µÈ ·¹Äڵ带 ÇØ´ç µµ¸ÞÀο¡ Ãß°¡ÇÑ´Ù.

    $ nsupdate
    > update add freefall.freebsd.org. 3600 IN A 210.124.149.150
    > [Enter]
    ...(messages)...
    > ^D
    
    $ nsupdate
    > prereq nxrrset freebsd.org. IN MX
    > update add freebsd.org. 3600 IN MX 10 mail.freebsd.org.
    > [Enter]
    ...(messages)...
    > ^D

±âÁ¸¿¡ A, CNAME µîÀÇ ·¹Äڵ尡 ¼³Á¤µÈ µµ¸ÞÀÎ¸í¿¡ ´ëÇØ¼­ delete¸¦ ¼öÇàÄ¡ ¾Ê°í add ¸í·ÉÀ» ÀÔ·ÂÇßÀ»¶§ ±âÁ¸ ·¹ÄÚµåÀÇ µ¥ÀÌÅͰ¡ ÀÔ·ÂµÈ ·¹ÄÚµåÀÇ µ¥ÀÌÅÍ·Î ±³Ã¼µÉ°Å¶ó´Â »ý°¢Àº ÇÏÁö ¸»¾Æ¾ß ÇÑ´Ù. Áߺ¹µÈ A ·¹ÄÚµåÀÇ ÀÔ·ÂÀº µµ¸ÞÀο¡ ¿©·¯°³ÀÇ IP¸¦ ¸ÅÇÎÇÒ °ÍÀ̰í, CNAMEÀÌ ¼³Á¤µÈ µµ¸ÞÀθíÀº ´Ù¸¥ ·¹Äڵ尡 Á¸ÀçÇÒ ¼ö ¾øÀ½¿¡µµ CNAMEÀ» addÇÏ´Â ¸í·ÉÀÌ ÇØ´ç µµ¸ÞÀÎÀÇ A, MX¿Í °°Àº ·¹Äڵ带 ÀÚµ¿À¸·Î Á¦°ÅÇØÁÖÁö´Â ¾Ê±â ¶§¹®ÀÌ´Ù.

Dynamic Update¸¦ ÅëÇØ ¼öÁ¤µÈ ³»¿ªÀº Áï½Ã Àû¿ëµÇ¸ç named°¡ Á¾·áµÉ ¶§ ÇØ´ç Zone µ¥ÀÌÅͺ£À̽º¿¡ Á÷Á¢ ±â·ÏµÇ¾î ´ÙÀ½¹ø ±¸µ¿½Ã¿¡µµ ±× ³»¿ªÀÌ º¯ÇÔ¾øÀÌ Àû¿ëµÉ ¼ö ÀÖµµ·Ï ÇÑ´Ù.

Dynamic Update¿¡ ´ëÇÑ ¿äûÀÌ ÇØ´ç µµ¸ÞÀÎÀÇ Authority¸¦ °®´Â Secondary·Î º¸³»¾î Á³´Ù¸é Secondary ³×ÀÓ¼­¹ö´Â Primary ³×ÀÓ¼­¹ö·Î ¿äûÀ» Àü´ÞÇϵµ·Ï µÇ¾îÀÖ´Ù. ¹°·Ð ÀÌ·¯ÇÒ °æ¿ì¿£ PrimaryÀÇ allow-update ¾ï¼¼½º ¸®½ºÆ®¿¡´Â Secondary°¡ Æ÷ÇԵǾî ÀÖ¾î¾ß ÇÑ´Ù.



5.3. ¹Ì·¯¸µ ¼­¹ö°£ÀÇ ºÎÇÏ °øÀ¯

¼­¹ö°¡ È÷Æ®¼ö¸¦ °¨´çÇÏÁö ¸øÇÒ °æ¿ì, ±× ÇØ°áÃ¥À¸·Î½á ´Ù¼öÀÇ ¹Ì·¯¸µ ¼­¹ö¸¦ ¿î¿µÇÏ¿©, ºÎÇϸ¦ ºÐ´ã½ÃŰ´Â ¹æ¹ýÀ» »ý°¢ÇÒ ¼ö ÀÖ´Ù. ÇÏÁö¸¸, ÀÌ·¯ÇÑ ¹æ¹ýÀº ¹Ì·¯¸µ ¼­¹ö¸¦ »ç¿ëÀÚ¿¡°Ô È«º¸ÇÏ¿© ¼­¹öÀÇ ºÎÇϰ¡ À̵¿Çϴµ¥ ½ÇÁúÀûÀ¸·Î ¸¹Àº ½Ã°£ÀÌ ¼Ò¿äµÇ°í, ÀûÀýÇÑ ºÎÇÏ ºÐ¹è¸¦ ±â´ëÇϱⰡ ÈûÀÌµç ¹®Á¦°¡ ÀÖ´Ù. ±×·¡¼­ ÀüÈ­±¹ÀÇ ´ëÇ¥ ¹øÈ£ ¼­ºñ½º¿Í °°ÀÌ, »ç¿ëÀÚÀÇ ¿äûÀ» °¢°¢ÀÇ ¹Ì·¯¸µ ¼­¹ö·Î ¿¬°áÇØÁÖ´Â ´ëÇ¥ µµ¸ÞÀÎÀ» »ý°¢ÇÒ ¼ö Àִµ¥, ¿©±â¿¡¼­ ±× ¹æ¹ýÀ» ¼Ò°³ÇÑ´Ù. Shuffle AddressesÀ̶ó ºÒ¸®´Â ÀÌ Æ¯º°ÇÑ ±â¹ýÀº BIND 4.9 ºÎÅÍ Áö¿øµÈ´Ù.

    www             180     IN      A       210.105.79.101
                    180     IN      A       210.105.79.102
                    180     IN      A       210.105.79.103

ÇϳªÀÇ È£½ºÆ®¸í¿¡ ¿©·¯°³ÀÇ IPÁÖ¼Ò¸¦ ÁÖ¾úÀ» °æ¿ì, ³×ÀÓ¼­¹ö´Â ÇØ´ç µµ¸ÞÀο¡ ´ëÇØ ´ÙÀ½°ú °°ÀÌ ¶ó¿îµå ·Îºó ¹æ½ÄÀ¸·Î ÀÀ´ä ÇÑ´Ù.

    $ nslookup www.nobreak.com
    Name:    www.nobreak.com
    Addresses:  210.105.79.101, 210.105.79.102, 210.105.79.103
    
    $ nslookup www.nobreak.com
    Name:    www.nobreak.com
    Addresses:  210.105.79.102, 210.105.79.103, 210.105.79.101
    
    $ nslookup www.nobreak.com
    Name:    www.nobreak.com
    Addresses:  210.105.79.103, 210.105.79.101, 210.105.79.102

À̰ÍÀÌ ·Îµå ¹ß·£½Ì(Load Balancing)Àº ¾Æ´ÏÁö¸¸, Ŭ¶óÀÌ¾ðÆ®´Â 3´ëÀÇ ¼­¹ö¿¡ ¾î´ÀÁ¤µµ °øÆòÇÏ°Ô Á¢¼ÓµÇ¹Ç·Î, ºÎÇϸ¦ °øÀ¯ÇÏ´Â È¿°ú¸¦ ¾òÀ» ¼ö ÀÖ°í, ¶ÇÇÑ ¿ÜºÎ·Î´Â ´ëÇ¥ µµ¸ÞÀθ¸À» ¾Ë¸®¸é µÇ¹Ç·Î, ¼­¹öÀÇ È®Àå ¹× Ãà¼Ò¿¡ À¯¿¬ÇÏ´Ù. º» ±â¹ýÀ» Àû¿ëÇÒ ¶§¿¡´Â ¶ó¿îµå ·ÎºóÀÌ Áö¿øµÇÁö ¾Ê´Â ³×ÀÓ¼­¹ö¸¦ °í·ÁÇÏ¿© TTLÀ» ³·°Ô Ã¥Á¤(TTLÀÌ ¸¸±âÇÏ¿© ´Ù½Ã ¿äûÀÌ µé¾î¿Àµµ·Ï)ÇÏ´Â °Íµµ ÁÁ´Ù.

¶ÇÇϳªÀÇ ¹æ¹ýÀ¸·Î´Â ´Ù¼öÀÇ CNAMEÀ» ¿¬°áÇÏ´Â ¹æ¹ýÀÌ´Ù. ¿øÄ¢ÀûÀ¸·Î ´Ù¼öÀÇ CNAMEÀº °ÅºÎµÇ±â ¶§¹®¿¡, ¹Ýµå½Ã ´ÙÀ½°ú °°ÀÌ ºÎÆ® ÆÄÀÏ¿¡ º°µµÀÇ ¿É¼ÇÀ» ÁÖ¾î¾ß ÇÑ´Ù.

    options {
            multiple-cnames yes;
    };

À̰ÍÀº BIND-8 ¿¡¼­¸¸ °¡´ÉÇϸç, ´ëÇ¥ÀûÀ¸·Î YAHOO!(www.yahoo.com)°¡ ÀÌ·¯ÇÑ ¹æ¹ýÀ¸·Î ¿î¿µµÈ´Ù.

    www             180     IN      CNAME   www1.nobreak.com.
                    180     IN      CNAME   www2.nobreak.com.
                    180     IN      CNAME   www3.nobreak.com.
    www1            180     IN      A       210.105.79.101
    www2            180     IN      A       210.105.79.102
    www3            180     IN      A       210.105.79.103
            180 IN  A   210.105.79.104
            180 IN  A   210.105.79.105

´Ù¼öÀÇ A ·¹ÄÚµå ¹æ½ÄÀº ResolverÀÇ ·ÎÄà NS°¡ Authority NS¿¡¼­ ´Ù¼öÀÇ IP(¶ó¿îµå ·ÎºóµÈ)¸¦ ³Ñ°Ü¹Þ¾Æ ij½¬¿¡ ÀúÀåÇØ µÐ ÈÄ ÀÚüÀûÀ¸·Îµµ ¶ó¿îµå ·Îºó󸮸¦ ÇØÁÖÁö¸¸, ´Ù¼öÀÇ CNAME ¹æ½ÄÀº ·ÎÄà NS°¡ ÇÑ °³ÀÇ ÁÖ¼Ò¸¸À» ³Ñ°Ü¹Þ±â ¶§¹®¿¡ ÀÚü ¶ó¿îµå ·ÎºóÀÌ ºÒ°¡´ÉÇϸç, TTLÀÌ ¸¸±âµÉ ¶§±îÁö ÇØ´ç ResolverµéÀº ÇϳªÀÇ ÁÖ¼Ò¸¦ »ç¿ëÇÏ°Ô µÈ´Ù.

    * Authority NS¿¡ Á÷Á¢ ÁúÀÇÇÏ¿´À» °æ¿ì
    $ nslookup  www.nobreak.com  ns.nobreak.com
    Name:    www1.nobreak.com
    Address:  210.105.79.101
    Aliases:  www.nobreak.com
    
    $ nslookup  www.nobreak.com  ns.nobreak.com
    Name:    www2.nobreak.com
    Address:  210.105.79.102
    Aliases:  www.nobreak.com
    
    $ nslookup  www.nobreak.com  ns.nobreak.com
    Name:    www3.nobreak.com
    Address:  210.105.79.103, 210.105.79.104, 210.105.79.105
    Aliases:  www.nobreak.com
    * ³×ÀÓ¼­¹öÀÇ Ä³½¬(Third Party Name Server)¿¡¼­ ¹Þ¾Æ¿Ã °æ¿ì
    $ nslookup  www.nobreak.com  ns.kornet.ne.kr
    Name:    www2.nobreak.com
    Address:  210.105.79.102
    Aliases:  www.nobreak.com
    
    $ nslookup  www.nobreak.com  ns.kornet.ne.kr
    Non-authoritative answer:
    Name:    www2.nobreak.com
    Address:  210.105.79.102
    Aliases:  www.nobreak.com
    
    $ sleep 180  (TTLÀÌ ¸¸±âµÉ ¶§ ±îÁö ±â´Ù¸° ÈÄ)
    
    $ nslookup  www.nobreak.com  ns.kornet.ne.kr
    Non-authoritative answer:
    Name:    www3.nobreak.com
    Address:  210.105.79.103, 210.105.79.104, 210.105.79.105
    Aliases:  www.nobreak.com
    
    $ nslookup  www.nobreak.com  ns.kornet.ne.kr
    Non-authoritative answer:
    Name:    www3.nobreak.com
    Address:  210.105.79.104, 210.105.79.105, 210.105.79.103
    Aliases:  www.nobreak.com
    
    $ nslookup  www.nobreak.com  ns.kornet.ne.kr
    Non-authoritative answer:
    Name:    www3.nobreak.com
    Address:  210.105.79.105, 210.105.79.103, 210.105.79.104
    Aliases:  www.nobreak.com
   

Âü°í·Î, ·Îµå ¹ë·±½ÌÀ» ±¸ÇöÇϱâ À§Çؼ­´Â ½Ã½ºÅÛÀÇ ºÎÇÏ¿¡ µû¶ó ¶ó¿ìÆÃÀ» Á¶Á¤ÇÏ´Â ½ºÀ§Ä¡³ª Ŭ·¯½ºÅ͸µ(Clustering) ¼Ö·ç¼ÇÀ» ÅëÇÏ¿©¾ß ÇÑ´Ù.



[¿ø±Û¸µÅ©] : https://www.linux.co.kr/home2/board/subbs/board.php?bo_table=lecture&wr_id=278


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