ʻO ka mask subnet 255.255.255.0 ka helu pūnaewele kaʻina maʻamau i hoʻohanaʻia ma nā kamepiula i hoʻohuiʻia i ka Internet Protocol (IPv4) pūnaewele. Ma waho aʻe o kona hoʻohanaʻana i nā mea kelepona pūnaewele home , hiki iāʻoe ke hālāwai pū me kēia makuka ma nā hōʻike hoʻonaʻauaoʻoihana likeʻole me ka CCNA .
E waiho ma lalo o ka papa hoʻomalu o ke kula, e hoʻokaʻawale i kahi'āpana o nā pule IP ma nā liʻiliʻi liʻiliʻi. Hoʻomaʻaha kēia hana i ka'enele pūnaewele a hiki i ka loaʻaʻana o ke komoʻana ma waena o nā pūmole.
Mālama kahi mask subnet i nā palapala hoʻohālike.
255.255.255.0 a me ka Subnetting
Nā palapala hoʻohālikelike kahiko i hanaʻia me nā mea i kapaʻia he papahana papahana i hoʻokaʻawale i nā inoa IP ma kahi o nā papa he elima (Class A / B / C / D / E) e like me ka helu o ka helu helu IP.
ʻO ka mask subnet 255.255.255.0 ka mea i hoʻololi i ka helu binary 32-bit:
- 11111111 11111111 11111111 00000000
Loaʻa nā helu 0 o kēia mask i ka helu IP o nā waihona subnet-8 a iʻole i kahi 256 mau helu wahi ma kēia hihia. Hiki iā ia ke ho'ākāka i ka helu nui o nā subnetworks liʻiliʻi ma o ka hoʻololiʻana i kahi mask e like me ka hōʻikeʻana i ka papa ma lalo nei.
| Kakuhihewa | Pākuena | Nodes / Subnet |
|---|---|---|
| 255.255.255.0 | 1 | 254 |
| 255.255.255.128 | 2 | 126 |
| 255.255.255.192 | 4 | 62 |
| 255.255.255.224 | 8 | 30 |
| 255.255.255.240 | 16 | 14 |
| 255.255.255.248 | 32 | 6 |
| 255.255.255.252 | 64 | 2 |
Ua mālamaʻia kahi mask subnet masana i pololeiʻole (kapaʻiaʻo netmask ) i kahiʻano o ka laulāʻana o ka laulā .
Nāʻaoʻao a me ka CIDR
Ma ka papa hana maʻamau, ua hoʻopauʻia nā wāwae IP i hoʻohanaʻoleʻia no ka mea,ʻo nā mea lawelawe pūnaewele a me nā hui nui i mālama i nā poʻomanaʻo i hikiʻole ke mahele.
ʻO ka hapanui o ka pūnaewele i hoʻohuliʻia i ka pūnaewele IP papawaʻole e kākoʻo i nā kulekele hoʻololi a maʻalahi i ka piʻiʻana o ka noi no nā IPV4 pūnaewele pūnaewele i nā makahiki 1990.
Nā papahana papahana i hoʻololi i ka hōʻike kuʻuna o ka papahana moʻomeheu i kahi hōʻokoʻa pokole e pili ana i ka helu o 1 mau helu i loko o ka uhi.
Ka Papa Hana Kūkākūkā Puʻupuʻu kūlohelohe i kākau ai i kahi IP IP a me kona uhi pūnaewele pili i keʻano:
xxx.xxx.xxx.xxx/n
Maanei, n e helu i kahi helu ma waena o ka 1 a me 31 ka helu o 1 mau pai i loko o ka uhi.
Hoʻopiliʻo CIDR i ke kākoʻoʻana o ka IP kūikawā a me nā meaʻike pūnaewele pūnaewele me nā helu kikowaena IP ma muli o kā lākou papa moʻomeheu. ʻO nā mea leka e kākoʻo i ka CIDR eʻike i kēia mau pūnaewele e like me nā alahele o kēlā me kēia ala, inā paha lākou e hōʻailona i kahi hōʻuluʻuluʻia o nā subteets kahiko.
Nā Papa Hana Pūnaewele
ʻO ka hui InterNIC nāna e mālama i nā inoa inoa pūnaewele e hoʻokaʻawale ana i nā inoa IP ma nā papa. ʻO ka hapanui o nāʻano maʻamau o kēia mau papahana A, B, a me C. Na nā papahana C C kekahi mea hoʻohana i kahi mask subnet paʻamau o 255.255.255.0.
E hoʻohana i ka 255.255.255.0 i lilo he IP Address
ʻOiai i hōʻikeʻia ma keʻano o kahi helu helu IP, nā meahana pūnaewele wale nō e hoʻohana wale i 255.255.255.0 i kahi mask aʻaʻole e like me kahi IP IP hoʻohana. Ke ho'āʻo nei e hoʻohana i kēia helu (aiʻole kekahi helu IP e hoʻomaka me ka 255) ma ke 'ano he helu kaikaʻina e hoʻohui i ka pilina o ka IP i ka palaki ma muli o ka ho'ākākaʻana o nā pae helu ma nā pūnaewele IP.