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CIDR and address space

Mohammad Nasim
Level 1
Level 1

hello everyone,

it is long time and i think that CIDR is just a routing method that allows routers reduce routing table size.

tonight, i was reading a book mentioning that CIDR saves address space.

This makes sense of what follows:

  • assume your organization has been assigned two class C ranges 170.15.0.0 and 170.15.1.0
  • CIDR may help reducing tables by advertising both as 170.15.1.0 /23 [255.255.254.0]

my two questions are:

  • Is 170.15.0.255 a broadcast address?
  • Is 170.15.1.0 a network address?

if so, then we have not saved address space.

Actually, i have found many misundestandings regarding network concepts in this book and other books of the same publisher, but i still need to understand this in depth.

BTW, this is not a cisco press book

thank you in advance

Mohammad