27 September 2013
Subnetting CIDR dan VLSM
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16.57
CIDR Subneting
Sebuah perusahaan yang bergerak dibidang penjualan tempe gembus memiliki 4 lantai. tiap lantai terdapat sebuah jaringan komputer kecil, lantai 1 14 komputer, lantai 2, 8 komputer, lantai 3 20 komputer,lantai 4 31 Komputer
ip yang digunakan 192.168.1.0/24
Diketahui :
lt.1 14 komputer
lt.2 8 Komputer
lt.3 20 Komputer
lt.4 31 Komputer
carilah!
host?
subnet mask?
subnet?
net id baru?
range?
broadcast?
pertama2
lihat host terbesar.
host = 64. karena 64 > 33(31+2)
usable host = 62 (64-2)
subnet mask = 255.255.255.192
subnet = 2^n = 2^2 = 4
CIDR :
net id range broadcast
192.168.1.0 1 – 62 192.168.1.63 (lt.4 31 Komputer)
62 – 31 = 31
192.168.1.64 65 – 126 192.168.1.127 (lt.3 20 Komputer)
62 – 20 = 42
192.168.1.128 129 – 190 192.168.1.191 (lt.1 14 komputer)
62 – 14 = 48
192.168.1.192 193 – 254 192.168.1.255 (lt.2 8 Komputer)
62 – 8 = 54
VLSM :
31 komputer :
net id = 192.168.1.0
host = 64
usable host = 62 (64-2)
subnet mask = 255.255.255.192
subnet = 2^n = 2^2 = 4
range = 192.168.1.1 – 192.168.1.62
broadcast = 192.168.1.63
jadi = 62 – 31 = 31
20 Komputer :
net id = 192.168.1.64
subnet = 255.255.255.224
host = 32 = 30
broadcast = 192.168.1.95
range = 65 – 94
jadi = 30 – 20 = 10 (sisa host)
14 komputer :
net id = 192.168.1.96
host = 16 = 14
subnet = 255.255.255.240
broadcast = 192.168.1.111
range = 97 – 110
jadi = 14 – 14 = 0 (gak ada sisa)
8 Komputer :
net id = 192.168.1.112
host = 16 = 14
subnet = 255.255.255.240
broadcast = 192.168.1.127
range = 113 – 126
14 – 8 = 6
Source :http://bimadwiangga.wordpress.com/2013/02/11/subnetting-cidr-vs-vlsm-kjk/
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