CHAPTER 3. Subnetting, CIDR, and Variable Length Subnet Masking
Introduction
If you want to pass the Cisco Certified Network Associate (CCNA) certification exam and have a successful career in the field of networking, you need to understand how to divide and combine networks through the process of subnetting and classless interdomain routing (CIDR). It is imperative to understand what devices on a network are able to communicate with one another. Network configurations such as an incorrect subnet mask can result in two devices not being able to communicate.
CCNAs are not the only individuals who need to understand CIDR notation. Computer forensic investigators, intrusions investigators, penetration testers, and even hackers need to be aware of CIDR ...

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