Subnet Mask Txhais thiab Piv txwv
Lub vas sab qhov ncauj yog qhov chaw nyob tus IP -xws li qhov kev sib tshuam hauv subnetwork uas lub computer los yog lwm yam khoom siv network. Nws yog ib tug 32-ntsis tus lej uas faib qhov chaw nyob tus IP rau hauv nws ob yam: lub chaw nyob network thiab chaw nyob.
Ib lub ntsej muag subnet (tseem hu ua netmask), tom qab ntawd, nws zoo li no:
Lub npog ncauj lus subnet yog tsim los ntawm kev teeb tsa tag nrho cov khoom sib txuas rau 1s thiab cov khoom siv khoom noj rau 0s. Ib lub network muaj ob qhov chaw nyob uas tsis tuaj yeem raug xa mus rau cov tswvcuab, thiab cov no suav txog 0 rau qhov chaw nyob network thiab 255 rau qhov chaw tshaj tawm.
Subnet ntsej muag piv txwv
Cov no yog cov netmasks siv rau Chav Kawm A (16-ntsis), Chav Kawm B (16-ntsis), thiab Class C (24-bit) tes hauj lwm:
- Chav kawm A tes txhawb 16,777,216 hom thiab muaj ib lub npog qhov ncauj ntawm 255.0.0.0.
- Cov chav kawm B hoob kawm muaj ib daim npog lub xov tooj ntawm 255.255.0.0 thiab tsuas muaj 65,534 tus IP.
- Feem ntau cov tsev tes hauj lwm hauv tsev yog Class C, xaiv los ntawm ib lub npog qhov ncauj ntawm 255.255.255.0. Qhov loj ntawm network no muaj peev xwm muaj txog 256 tus IP, ntau chav nyob rau ib qho chaw hauv tsev lossis lag luam me.
Xav txog qhov chaw tus IP 128.71.216.118. Yog tias peb xav tias nws yog B Class chaw nyob, tus thawj ob tug xov tooj (128.71) piav qhia txog hoob B hoob chaw nyob thaum ob lub xeem (216.118) txheeb xyuas qhov chaw nyob.
Saib ntau ntxiv txog subnet qhov ncauj qhov ntswg hauv peb lub ntsej muag Subnet thiab Subnetting tutorial.