Either it's a misquote, or the book has a typo, as it probably meant to read "CIDR may help reducing tables by advertising both as 188.8.131.52 /23 [255.255.254.0]". The answers are "no" and "yes" to your two questions, respectively.
Clare Gough - "CCNP BSCI exam certification guide" author has mentioned in her book the following:
Although eight Class C addresses are provided to the organization, they are identified to the Internet as one address 184.108.40.206, with a prefix of /21, which is the subnet mask of 255.255.248.0.
The organization does not have to use the addresses as Class C addresses. In accordance with the original rules, the organization can use the right-most zeroed bits however it deems approperiate.
3rd Ed. page 54.
she was talking about 220.127.116.11 /24 to 18.104.22.168 /24
Summarization is just a routing trick, but not a supernetting.
CIDR is a routing trick and a supernetting, which means that the right most zeroed bits are under your control. They are for host by definition, but you still can use them as classful, or subnet them as you wish.
This sounds logical and answers the question: Why bother studying both summarization and CIDR ?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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