How to ? Subnetting

Scenario How Many Networks? 2 How Many Network addresses are required? 2 Addresses Used: subnet mask subnet mask How Many wasted addresses on each network? Network 1 Network 2 25 hosts Network1 Network

Current Address Space / /24 Total Addresses = 256 Useable Addresses = 254 Total Addresses = 256 Wasted Addresses = 254 Wasted Addresses = First Address Last Address 0 255

How to Subnet - 1 Write down last byte of host address as binary number: How many bits do you need to borrow? Rewrite Host part Host part Given class C address – /24, how can you create two different network addresses Borrow bits from host byte 1 bit borrowed = 2 1 networks 2 bit borrowed = 2 2 networks 4 networks – 2 = 2 Required

How to Subnet Host part How Many hosts per network? 2 6 = 64 hosts What are different network addresses? First Address - Unuseable Last Address - Unuseable Useable Addresses

How to Subnet – new subnet mask Underline network part: How many bits for network id 26 bits = new subnet mask or or / /26 Assign NEW SUBNET MASK TO to different networks

New Address Spaces New Address Space : 256/4 = /24 has changed to four address blocks as shown below: / / / /26

What changed after Subnetting Address Address Space is segmented addresses are segmented to four blocks of 64 each Subnet mask changed from 24 to 26 Number of useable IP addressed reduced from 254 to 62

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