Ib txoj hauv kev rau subnetting yog ua tiav siv txoj hauv kev hu ua VLSM lossis Hloov Pauv Ntev Subnet Mask. Qhov no yog lwm txoj hauv kev rau CLSM (qhov ntev ntev subnet daim npog qhov ncauj), hauv qhov uas siv VLSM koj subnet lub network los ntawm kev thov sib txawv subnet daim npog rau ntau lub subnet uas koj tsim. Txoj hauv kev no yog qhov nyiam dua thaum ntau lub subnets muaj qhov sib txawv ntau hauv cov naj npawb ntawm cov tswv uas lawv xav tau ntawm ib lub subnet. Hauv cov xwm txheej qee qhov subnets tsuas xav tau ob peb qhov chaw nyob thaum lwm tus xav tau ntau ntxiv.
Kev siv VLSM tuaj yeem ua tiav qhov no los ntawm kev pov tseg qhov chaw nyob tsawg li sai tau.
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Piv txwv tias koj tau txais qhov chaw nyob ntawm 192.168.10.0/24 thiab koj xav tau cov hauv qab no:
- subnet A ~ 66 tus tswv
- subnet B ~ 10 tus tswv
- subnet C ~ 22 tus tswv
- subnet D ~ 2 tswv
Cov kauj ruam
Kauj Ruam 1. Sau tag nrho koj cov peev txheej ua tau
- /24 = 254 tus tswv
- /25 = 126 tus tswv
- /26 = 64 tus tswv
- /27 = 32 tus tswv
- /28 = 16 tus tswv
- /29 = 6 tus tswv
- /30 = 2 tus tswv
Kauj Ruam 2. Npaj koj qhov yuav tsum tau ua los nqis tes
- Subnet A - 66
- Subnet C - 22
- Subnet B - 10
- Subnet D - 2
Kauj Ruam 3. Muab cov qhov ncauj qhov ntswg subnet tsim nyog rau txhua subnet
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Tshaj tawm Thawj qhov siab tshaj plaws subnet
Muab 192.168.10.20 daim npog /25 rau subnet A kom txaus siab xav tau rau 66 tus tswv. Qhov kawg octet ntawm subnet daim npog yuav yog 1000000 (255.255.255.128)
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Muab lub subnet siab tshaj tom ntej
Muab 192.168.10.128 daim npog /27 rau subnet C; lub xeem octet ntawm subnet daim npog yuav yog 11100000 (255.255.255.224)
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Muab lub subnet siab tshaj tom ntej
Muab 192.168.10.160 daim npog /28 rau subnet B; qhov kawg ntawm lub ntsej muag subnet yuav yog 11110000 (255.255.255.240)
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Muab lub subnet kawg
Muab 192.168.10.176 daim npog /30 rau subnet D; qhov kawg octet ntawm subnet daim npog yuav yog 11111100 (255.255.255.252)
Kauj Ruam 4. Txheeb xyuas cov ntsiab lus Subnetting
- Subnet A = 192.168.10.0/25 ~ 126 tus tswv (xav tau 66)
- Subnet C = 192.168.10.128/27 ~ 30 tus tswv (xav tau 22)
- Subnet B = 192.168.10.160/28 ~ 14 tus tswv (xav tau 10)
- Subnet D = 192.168.10.176/30 ~ 2 tus tswv (xav tau 2)
Lub tswv yim
Koj tuaj yeem ua daim ntawv ruaj khov ntawm TXHUA cov peev txheej hauv qab thiab tus naj npawb ntawm cov tswv siv tau thiab siv qhov ntawd txhua lub sijhawm koj siv VLSM subnet ntau dua li suav cov txiaj ntsig txhua lub sijhawm
Lus ceeb toom
- Ceev faj thaum subnetting thiab xyuas kom tseeb tias koj qhov chaw nyob sib txawv rau txhua subnet raug
- Nco ntsoov tias koj lub phiaj xwm hais daws tau raws li qhov yuav tsum tau ua
- Thaum teev cov peev txheej tuaj yeem ua kom ntseeg tau tias tus naj npawb ntawm cov tswv yog tus lej USABLE tus tswv. Siv cov qauv (2^n) -2 qhov twg n = tus naj npawb ntawm cov tswv cuab rau qhov subnet daim npog qhov ncauj. Peb ib txwm rho 2 tus lej rau tus lej network thiab chaw nyob tshaj tawm !!!
