{"id":1541,"date":"2019-05-02T20:26:21","date_gmt":"2019-05-02T17:26:21","guid":{"rendered":"https:\/\/www.nav.ro\/blog\/?p=1541"},"modified":"2019-05-27T16:19:15","modified_gmt":"2019-05-27T13:19:15","slug":"ce-sunt-subnet-urile","status":"publish","type":"post","link":"https:\/\/www.nav.ro\/blog\/ce-sunt-subnet-urile\/","title":{"rendered":"Ce sunt subnet-urile"},"content":{"rendered":"\n<p>O subre\u021bea permite ca fluxul de trafic al re\u021belei \u00eentre gazde s\u0103 fie separat pe baza unei configura\u021bii de re\u021bea. Organiz\u00e2nd gazde \u00een grupuri logice, subnetting-ul poate \u00eembun\u0103t\u0103\u021bi securitatea re\u021belei \u0219i performan\u021ba acesteia.<\/p>\n\n\n\n<p>Subnet Mask<\/p>\n\n\n\n<p>Poate cel mai recunoscut aspect al subnetting-ului este masca de subre\u021bea. La fel ca \u0219i adresele IP, o masc\u0103 de subre\u021bea con\u021bine patru octe\u021bi (32 de bi\u021bi) \u0219i este adesea scris\u0103 folosind aceea\u0219i nota\u021bie &#8222;zecimal-punctat\u0103&#8221;. De exemplu, o masc\u0103 de subre\u021bea foarte obi\u0219nuit\u0103 \u00een reprezentarea sa binar\u0103:<\/p>\n\n\n\n<p>11111111 11111111 11111111 00000000<\/p>\n\n\n\n<p>Este prezentat\u0103 \u00een mod obi\u0219nuit \u00een form\u0103 echivalent\u0103, mai lizibil\u0103:<\/p>\n\n\n\n<p>255.255.255.0<\/p>\n\n\n\n<p>Aplicarea unei m\u0103\u0219ti de subre\u021bea<\/p>\n\n\n\n<p>O masc\u0103 de subre\u021bea nu func\u021bioneaz\u0103 ca o adres\u0103 IP \u0219i nici nu poate exista independent de aceasta. \u00cen schimb, m\u0103\u0219tile de subre\u021bea \u00eenso\u021besc o adres\u0103 IP, iar cele dou\u0103 valori func\u021bioneaz\u0103 \u00eempreun\u0103. Aplicarea m\u0103\u0219tii de subre\u021bea la o adres\u0103 IP \u00eemparte adresa \u00een dou\u0103, o adres\u0103 de re\u021bea extins\u0103 \u0219i o adres\u0103 gazd\u0103.<\/p>\n\n\n\n<p>Pentru ca o masc\u0103 de subre\u021bea s\u0103 fie valid\u0103, bi\u021bii ei din st\u00e2nga trebuie s\u0103 fie seta\u021bi la &#8216;1&#8217;. De exemplu:<\/p>\n\n\n\n<p>00000000 00000000 00000000 00000000<\/p>\n\n\n\n<p>Este o masc\u0103 de subre\u021bea nevalid\u0103, deoarece bitul din st\u00e2nga este setat la &#8222;0&#8221;.<\/p>\n\n\n\n<p>Dimpotriv\u0103, bi\u021bii cei mai din dreapta dintr-o masc\u0103 de subre\u021bea valid\u0103 trebuie s\u0103 fie seta\u021bi la &#8222;0&#8221;, nu la &#8222;1&#8221;. Prin urmare:<\/p>\n\n\n\n<p>11111111 11111111 11111111 11111111<\/p>\n\n\n\n<p>Este nevalid.<\/p>\n\n\n\n<p>Toate m\u0103\u0219tile de subre\u021bea valide con\u021bin dou\u0103 p\u0103r\u021bi: partea st\u00e2ng\u0103 cu to\u021bi bi\u021bi de masc\u0103 seta\u021bi la &#8216;1&#8217; (por\u021biunea de re\u021bea extins\u0103) \u0219i partea dreapt\u0103 cu to\u021bi bi\u021bi seta\u021bi la &#8216;0&#8217; (por\u021biunea gazd\u0103), cum ar fi primul exemplu de mai sus .<\/p>\n\n\n\n<p>Cum func\u021bioneaz\u0103<\/p>\n\n\n\n<p>Subnetting-ul func\u021bioneaz\u0103 aplic\u00e2nd conceptul adreselor de re\u021bea extinse la adresele individuale ale computerului (\u0219i ale unui alt dispozitiv de re\u021bea). O adres\u0103 extins\u0103 de re\u021bea include at\u00e2t o adres\u0103 de re\u021bea, c\u00e2t \u0219i un num\u0103r suplimentar de bi\u021bi care reprezint\u0103 num\u0103rul de subre\u021bea. \u00cempreun\u0103, aceste dou\u0103 elemente de date suport\u0103 o schem\u0103 de adresare pe dou\u0103 niveluri, recunoscut\u0103 de implement\u0103rile standard ale Protocolului de Internet. Adresa de re\u021bea \u0219i num\u0103rul de subre\u021bea, atunci c\u00e2nd sunt combinate cu adresa gazd\u0103, suport\u0103 o schem\u0103 pe trei niveluri.<\/p>\n\n\n\n<p>Lua\u021bi \u00een considerare urm\u0103torul exemplu din lumea real\u0103. O \u00eentreprindere mic\u0103 inten\u021bioneaz\u0103 s\u0103 utilizeze re\u021beaua 192.168.1.0 pentru gazdele sale interne (intranet). Departamentul de resurse umane dore\u0219te ca laptopurile s\u0103 se afle pe o parte restrictionata a acestei re\u021bele deoarece stocheaz\u0103 informa\u021bii despre salarizare \u0219i alte date sensibile ale angaja\u021bilor. Dar pentru c\u0103 aceasta este o re\u021bea de clas\u0103 C, masca de subre\u021bea implicit\u0103 de 255.255.255.0 permite ca toate computerele din re\u021bea s\u0103 fie conectate (pentru a trimite mesaje direct unul c\u0103tre cel\u0103lalt) \u00een mod implicit.<\/p>\n\n\n\n<p>Plasa\u021bi aceast\u0103 re\u021bea \u00een clasa C \u0219i stabili\u021bi \u0219i lungimea adresei de re\u021bea la 24 de bi\u021bi. Pentru a suporta aceast\u0103 re\u021bea, mai mult de 24 de bi\u021bi trebuie s\u0103 fie seta\u021bi la &#8216;1&#8217; \u00een partea st\u00e2ng\u0103 a m\u0103\u0219tii subre\u021belei. De exemplu, masca 25-bi\u021bi 255.255.255.128 creeaz\u0103 o re\u021bea cu dou\u0103 subre\u021bele a\u0219a cum se arat\u0103 \u00een Tabelul 1.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"765\" height=\"333\" src=\"https:\/\/www.nav.ro\/blog\/wp-content\/uploads\/2019\/05\/Screenshot-2019-05-02-at-20.19.50.png\" alt=\"\" class=\"wp-image-1542\" srcset=\"https:\/\/www.nav.ro\/blog\/wp-content\/uploads\/2019\/05\/Screenshot-2019-05-02-at-20.19.50.png 765w, https:\/\/www.nav.ro\/blog\/wp-content\/uploads\/2019\/05\/Screenshot-2019-05-02-at-20.19.50-300x131.png 300w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Pentru fiecare bit suplimentar setat la &#8216;1&#8217; din masc\u0103, un alt bit devine disponibil \u00een num\u0103rul subre\u021belei pentru a indexa subnetwork-urile adi\u021bionale. Un num\u0103r de subre\u021bea pe doui bi\u021bi poate suporta p\u00e2n\u0103 la patru subre\u021bele, un num\u0103r pe trei bi\u021bi suport\u0103 p\u00e2n\u0103 la opt subre\u021bele \u0219i a\u0219a mai departe.<\/p>\n\n\n\n<p>Re\u021bele \u0219i sub-re\u021bele private<\/p>\n\n\n\n<p>A\u0219a cum am men\u021bionat mai devreme \u00een acest articol, organele de conducere care administreaz\u0103 Protocolul de Internet au rezervat anumite re\u021bele pentru uz intern. \u00cen general, intraneturile care utilizeaz\u0103 aceste re\u021bele c\u00e2\u0219tig\u0103 mai mult control asupra gestion\u0103rii configura\u021biei IP \u0219i accesului la Internet. Consulta\u021bi RFC 1918 pentru mai multe detalii despre aceste re\u021bele speciale.<\/p>\n\n\n\n<p>Rezumat<\/p>\n\n\n\n<p>Subnetting-ul permite administratorilor de re\u021bea o anumit\u0103 flexibilitate \u00een definirea rela\u021biilor dintre gazdele re\u021belei. Gazdele pe diferite subre\u021bele pot discuta \u00eentre ele numai prin intermediul unor dispozitive de gateway de re\u021bea specializate, cum ar fi routerele. Abilitatea de a filtra traficul \u00eentre subre\u021bele poate face disponibil\u0103 mai mult\u0103 l\u0103\u021bime de band\u0103 pentru aplica\u021bii \u0219i poate limita accesul \u00een moduri preferate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O subre\u021bea permite ca fluxul de trafic al re\u021belei \u00eentre gazde s\u0103 fie separat pe baza unei configura\u021bii de re\u021bea. Organiz\u00e2nd gazde \u00een grupuri logice, subnetting-ul poate \u00eembun\u0103t\u0103\u021bi securitatea re\u021belei \u0219i performan\u021ba acesteia. Subnet Mask Poate cel mai recunoscut aspect al subnetting-ului este masca de subre\u021bea. La fel ca \u0219i adresele IP, o masc\u0103 de<\/p>\n","protected":false},"author":1,"featured_media":1576,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[155],"tags":[130,174,133],"class_list":["post-1541","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-info","tag-network","tag-subnet","tag-tcpip"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ce sunt subnet-urile - NAV.RO Blog<\/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:\/\/www.nav.ro\/blog\/ce-sunt-subnet-urile\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ce sunt subnet-urile - NAV.RO Blog\" \/>\n<meta property=\"og:description\" content=\"O subre\u021bea permite ca fluxul de trafic al re\u021belei \u00eentre gazde s\u0103 fie separat pe baza unei configura\u021bii de re\u021bea. Organiz\u00e2nd gazde \u00een grupuri logice, subnetting-ul poate \u00eembun\u0103t\u0103\u021bi securitatea re\u021belei \u0219i performan\u021ba acesteia. Subnet Mask Poate cel mai recunoscut aspect al subnetting-ului este masca de subre\u021bea. 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Organiz\u00e2nd gazde \u00een grupuri logice, subnetting-ul poate \u00eembun\u0103t\u0103\u021bi securitatea re\u021belei \u0219i performan\u021ba acesteia. Subnet Mask Poate cel mai recunoscut aspect al subnetting-ului este masca de subre\u021bea. 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