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Subnetting

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  3. AWS Certified Advanced Networking Specialty Exam
  5. Subnetting
  • It divides bigger network into smaller ones
  • Uses some part of hosts portion in an IP address to partition main network into different sub networks
  • used if administrative need to have more networks internally with lesser number of hosts in each network

Subnet Mask

  • Akin to IP address and is like – a.b.c.d
  • Has a one for bit positions belonging to network or subnetwork and contains a zero for the host portion
  • For example, the default subnet masks for class C is 255.255.255.0 or FF.FF.FF.00 or /24
  • Another example of subnetting explains the concept –
  • Original Network Address & Subnet Mask:   192.168.6.0 255.255.255.0
  • New Subnet Mask:        255.255.255.192
  • Bits Borrowed:   192.168.6.11|000000
  • # of possible networks: 4
  • Each Sub-Network address increments by 64
  • 1st Network       192.168.6.0
  • 1st Usable          192.168.6.1
  • Last Usable        192.168.6.62
  • Broadcast 192.168.6.63
  •  2nd Network      192.168.6.64
  • 1st Usable          192.168.6.65
  • Last Usable        192.168.6.126
  • Broadcast 192.168.6.127
  •  3nd Network      192.168.6.128
  • 1st Usable          192.168.6.129
  • Last Usable        192.168.6.190
  • Broadcast 192.168.6.191
  •  4nd Network      192.168.6.192
  • 1st Usable          192.168.6.193
  • Last Usable        192.168.6.254
  • Broadcast            192.168.6.255

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