subnetting and vlsm
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Subnetting
IPv4
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172.16.4.64 /26
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0
Binary Value
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0
Subnet Mask : 255.255.255.192
Network Address : 172.16.4.64
Broadcast Address : 172.16.4.127
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 1 1 1 1 1 1 1
Host Address : 172.16.4.65172.16.4.126 (62 Hosts)
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172.16.4.128 /26
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0
Binary Value
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0
Subnet Mask : 255.255.255.192
Network Address : 172.16.4.128
Broadcast Address : 172.16.4.191
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0
128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 1 1 1 1 1
Host Address : 172.16.4.129172.16.4.190 (62 Hosts)
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Subnet Mask
IP Address: 10.24.36.2 / 8 Subnet Mask?
IP Address: 10.24.36.2 / 12 Subnet Mask?
IP Address: 10.24.36.2 / 16 Subnet Mask?
IP Address: 10.24.36.2 / 23 Subnet Mask?
IP Address: 10.24.36.2 255.255.224.0 Prefix Mask?
IP Address: 10.24.36.2 255.255.255.192 Prefix Mask?
IP Address: 10.24.36.2 255.255.255.252 Prefix Mask?
IP Address: 10.24.36.2 255.254.0.0 Prefix Mask?
IP Address: 10.24.36.2 255.255.240.0 Prefix Mask?
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Help Desk LAN requires 80 hosts(192.168.10.0/24)
80 Hosts
2?= 80 (2 to the what power is 80)
27= 1282 = 126
126 Usable Hosts
Prefix: 32 - 7 = 25 (The 25 ends up being the
new subnet mask for this LAN) 192.168.10.0/25is the Subnet address/mask
of the Help Desk LAN
Number of bits in IP address minus the host bits
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Executive LAN requires 2 hosts(192.168.10.224/24)
2 Hosts
2?= 2 (2 to the what power is 2)
22= 42 = 2
2 Usable Hosts
Prefix: 32 - 2 = 30 (The 30 ends up being the
new subnet mask for this LAN)
192.168.10.224/30is the Subnet
address/mask of the Executive LAN
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In the 192.168.10.0 /24, you have
S0: 192.168.10.0 /25Helpdesk LAN
S1: 192.168.10.128 /26Sales LAN
S2: 192.168.10.192 / 27Admin LAN S3: 192.168.10.224 /30Executive LAN
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Back of a Router
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