Maaf ikut nimbrung tanya mengenai subnetting. Kalau yang saya baca di internet Subnetting itu salah satu fungsinya untuk membatasi jumlah host per subnet, untuk keamanan, dan untuk menghindari collision. yang ingin saya tanyakan :
1. Misal saya mau membagi 9 Subnet dgn cidr /28, jika itu dilakukan apakah masing2 subnet itu bisa saling komunikasi / tidak? jika tidak bagaimana caranya agar bisa komnunikasi antar subnet (bisa sharing files, print lwt jaringan, dll) ? apakah menggunakan router / pc router di setiap subnet atau ada cara lain ? 2. kemudian bagaimana cara mengetahui collision baik sebelum atau sesudah di subnet ? maksudnya dari segi performa bagaimana ? Thx --- In [email protected], Yuan Yudistira <yuanyudistiramail@...> wrote: > > lengkap... > > On Jun 27, 2011 8:53 AM, "priyanto uki" <ukay0504@...> wrote: > ** > > > jawaban no 1 > > subnetting: membagi sebuah jaringan/network menjadi beberapa > sub-jaringan/subnet > caranya: meminjam host bit utk dijadikan network bit > > rumus: 2^N - 2 >= subnet yg dibutuhkan > N = subnet bit (host bit yg dipinjam) > > Contoh soal: > jaringan 172.16.0.0/16 dibagi menjadi minimal 5 subnet > > langkah 1: mencari jumlah subnet bit (N) > 2^N - 2 >= 5 > N = 3 subnet bit > > langkah 2: menghitung subnet mask utk setiap subnet yg baru > subnet mask = NW bit yg ada + N > = 16 + 3 > = /19 --> /8./8./3./0 = 255.255.224.0 > > langkah 3: menghitung interval antar subnet > question --> di octet ke berapa, NW bit terakhir? octet ke-3 > > interval = 256 - 224 = 32 > interval = 2^hostBit di octet tsb = 2^5 = 32 > > BC address = next subnet - 1 > > jumlah subnet yg valid = 2^N - 2 = 2^3 - 2 = 6 subnet valid > dikurangi 2 karena ada subnet zeroes & ones > > khusus subnetting, ada 2 invalid subnet, yaitu: > 1. subnet zeroes --> subnet paling pertama (172.16.0.0) > 2. subnet ones --> subnet paling terakhir > > jumlah host bit di subnet /19 ==> 32 bit - 19 NW bit = 13 host bit > pada subnet /19, jumlah host per subnet = 2^13 - 2 = 8190 host per subnet > /19 > > subnetting = FLSM (fixed-length subnet mask) > kekurangan subnetting: alokasi ip kurang efisien (boros) > > ------------------------- > VLSM (variable-length subnet mask) > menghitung pembagian subnet berdasarkan kebutuhan host per subnet > > rumus: 2^H - 2 >= host yg dibutuhkan > H = host bit yg digunakan > > note: mulai dari subnet dengan kebutuhan host terbanyak > -------- > 2 subnet @ min 100 host > 2^H - 2 >= 100 ; H = 7 host bit > subnet mask = total bit IPv4 address - H > = 32 - 7 > = /25 --> /8./8./8./1 255.255.255.128 > interval = 256 - 128 = 128 (di octet ke-4) > interval = 2^7 = 128 > > jumlah host per subnet /25 = 2^7 - 2 = 126 host > > LAN JKT: > 172.16.0.0/25 BC: 172.16.0.127/25 > 172.16.0.128/25 BC: 172.16.0.255/25 > > 172.16.1.0 > ---------- > 3 subnet @ min 50 host > 2^H - 2 >= 50 ; H = 6 host bit > subnet mask = 32 - 6 > = /26 --> /8./8./8./2 > 255.255.255.192 > interval = 256 - 192 = 64 (interval ke 4) > interval = 2^6 = 64 > > jumlah host per subnet /26 = 2^6 - 2 = 62 host > > LAN SBY: > 172.16.1.0/26 BC: 172.16.1.63/26 > 172.16.1.64/26 BC: 172.16.1.127/26 > 172.16.1.128/26 BC: 172.16.1.191/26 > > jawaban no 2 : ip local yang di subnetting > > mohon jawaban yang lainnya > > > > [Non-text portions of this message have been removed] > > > > [Non-text portions of this message have been removed] > ------------------------------------ -- www.itcenter.or.id - Komunitas Teknologi Informasi Indonesia Gabung, Keluar, Mode Kirim : [email protected] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/ITCENTER/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/ITCENTER/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
