Class B Subnetting ( 3 Network )

Network 1

Jumlah Host    : 12
Subnet bit        : 2ⁿ-2 > 12 à 2⁴-2 = 14           Jadi, Subnet bit = 8-4 = 4
Subnet Mask   : 11111111.11111111.11111111.11110000 è  255.255.255.240
Network          : 172.100.5.0/28
Range IP         : 256-240  =  16                       16x2=32          16x3=48          16x4=64
                        : 17 - 30 ; 33 – 46 ; dst

Network 2

Jumlah Host    : 6
Subnet bit        : 2ⁿ-2 > 6 à 2³-2 = 6               Jadi, Subnet bit = 8-3 = 5
Subnet Mask   : 11111111.11111111.11111111.11111000 è  255.255.255.248
Network          : 174.169.222.0/29
Range IP         : 256-248  =  8             8x2=16            8x3=24            8x4=32
                        : 9 - 14 ; 17 – 22 ; dst

Network 3

Jumlah Host    : 2
Subnet bit        : 2ⁿ-2 > 2 à 2²-2 = 2               Jadi, Subnet bit = 8-2 = 6
Subnet Mask   : 11111111.11111111.11111111.11111100 è  255.255.255.252
Network          : 182.193.156.0/30
Range IP         : 256-252 =  4              4x2=8              4x3=12            4x4=16
                        : 5 - 6 ; 9 – 10 ; dst

SETTING IP Router Sebagai Gateway Network

No.	Device	Port	IP Address	Subnet Mask
1.	Router 2	Fastethernet 0/0	172.100.5.20	255.255.255.240
		Fastethernet 1/0	174.169.222.14	255.255.255.248
		Fastethernet 2/0	182.193.156.10	255.255.255.252
		Fastethernet 3/0	192.168.1.120	255.255.255.192