Praktik Perhitungan VLSM

Diketahui network: 192.168.10.0/25
Kebutuhan host:

• Subnet A = 60 host

• Subnet B = 24 host

• Subnet C = 12 host

• Subnet D = 5 host

A. Langkah Penyelesaian

1. Urutkan kebutuhan host dari terbesar → terkecil
   A (60), B (24), C (12), D (5)

2. Tentukan prefix yang sesuai untuk tiap subnet

   • 60 host → butuh /26 (62 host)

   • 24 host → butuh /27 (30 host)

   • 12 host → butuh /28 (14 host)

   • 5 host → butuh /29 (6 host)

3. Alokasikan jaringan dari awal blok (0) secara berurutan

   • Subnet A → 192.168.10.0/26

   • Subnet B → 192.168.10.64/27

   • Subnet C → 192.168.10.96/28

   • Subnet D → 192.168.10.112/29

4. Sisa jaringan menjadi cadangan

   • Cadangan → 192.168.10.120/29

B. Hasil Alokasi Subnet (Ringkas)

Subnet	Prefix	Network	Usable Host Range	Broadcast	Total Addr	Host Usable
Subnet A	/26	192.168.10.0	192.168.10.1 – 192.168.10.62	192.168.10.63	64	62
Subnet B	/27	192.168.10.64	192.168.10.65 – 192.168.10.94	192.168.10.95	32	30
Subnet C	/28	192.168.10.96	192.168.10.97 – 192.168.10.110	192.168.10.111	16	14
Subnet D	/29	192.168.10.112	192.168.10.113 – 192.168.10.118	192.168.10.119	8	6
Cadangan	/29	192.168.10.120	192.168.10.121 – 192.168.10.126	192.168.10.127	8	6