VLSM / CIDR

[jonk34567]

is vlsm and CIDR are same ? if they are different what is the different between them.it would be much better if anyone can provide me a example question. 

[Reza Sharifi]

Have a look:

https://supportforums.cisco.com/discussion/10547531/what-difference-between-cidr-and-vlsm

HTH

[Julio E. Moisa · Accepted solution]

Hi 

VLSM is a process to create/divide a supernet (big subnet) into a hierarchy of subnets with different sizes. It will help you to avoid the wasting of IP addresses for specific requests. See attachment. 

CIDR will represent the bits that belong to the subnet mask for specific subnet, It is a flexible method to create identifiers for networks or hosts. 

For example a subnet: A.B.C.D with mask 255.255.255.128 (25 bits)

CIDR --> /25. 

So you can represent your subnet like  A.B.C.D/25

Hope it is useful :-)
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Thank you