Test Your Networking Skills

Subnetting Practice Lab

1. Standard Subnetting

Worked Example

Given: 192.168.1.10/26
/26 → 6 host bits
Total IPs = 2⁶ = 64

Network: 192.168.1.0
Broadcast: 192.168.1.63
First Usable: 192.168.1.1
Last Usable: 192.168.1.62
Usable IPs: 62

2. Fixed Length Subnetting (FLSM)

Worked Example

Base Network: 192.168.10.0/24
Required Subnets: 8
8 → need 3 bits (2³ = 8)
New CIDR = /27

Each subnet = 32 IPs
Usable per subnet = 30

3. Variable Length Subnetting (VLSM)

Worked Example

Base Network: 10.0.0.0/24
Hosts Required: 100
Need 100 + 2 = 102
2⁷ = 128 → 7 host bits
CIDR = /25

Total IPs = 128
Usable = 126