CCNA 200-301 Portable Command Guide 5th Edition 36

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CHAPTER 2How to Subnet IPv4 AddressesThis chapter provides information concerning the following topics:■Subnetting a Class C network using binary■Subnetting a Class B network using binary■Binary ANDing■So Why AND?■Shortcuts in binary ANDingIn the previous chapter, we looked at how IPv4 addressing works, and the idea that itis possible to break a single large networks into multiple smaller networks for moreflexibility in your network design. This chapter shows you how to perform this task. Thisis known assubnefting.NOTE:Some students (and working IT professionals) are intimidated by subnettingbecause it deals with math; more specifically, binary math. While some people pickthis up quickly, some take more time than others. And this is OK. Just keep practicing.The ability to subnet IPv4 addresses is a key skill that is required to pass the CCNA200-301 exam. This makes some people nervous during an exam. Just remember thatthis is math, and therefore there has to be an absolute correct answer. If you follow thesteps, you will come up with the correct answer. I always tell my students thatsubnetting and working with binary should be the easiest questions you have on anexam, because you know that if you follow the steps you will arrive at the correctanswer. Keep calm, remember the rules, and you will be fine. After all, it's just math,and math is easy.NOTE:Remember from the previous chapter that there are network bits (N bits) andhost bits (H bits) in an IPv4 address and they follow a specific pattern:Octet #I234Class A AddressNHHHClass B AddressNNHHClass C AddressNNNHAll Os in host portion = network or subnetwork addressAll 1s in host portion = broadcast addressCombination of 1s and Qs in host portion = valid host addressCHAPTER 2How to Subnet IPv4 AddressesThis chapter provides information concerning the following topics:■Subnetting a Class C network using binary■Subnetting a Class B network using binary■Binary ANDing■So Why AND?■Shortcuts in binary ANDingIn the previous chapter, we looked at how IPv4 addressing works, and the idea that itis possible to break a single large networks into multiple smaller networks for moreflexibility in your network design. This chapter shows you how to perform this task. Thisis known assubnefting.NOTE:Some students (and working IT professionals) are intimidated by subnettingbecause it deals with math; more specifically, binary math. While some people pickthis up quickly, some take more time than others. And this is OK. Just keep practicing.The ability to subnet IPv4 addresses is a key skill that is required to pass the CCNA200-301 exam. This makes some people nervous during an exam. Just remember thatthis is math, and therefore there has to be an absolute correct answer. If you follow thesteps, you will come up with the correct answer. I always tell my students thatsubnetting and working with binary should be the easiest questions you have on anexam, because you know that if you follow the steps you will arrive at the correctanswer. Keep calm, remember the rules, and you will be fine. After all, it's just math,and math is easy.NOTE:Remember from the previous chapter that there are network bits (N bits) andhost bits (H bits) in an IPv4 address and they follow a specific pattern:Octet #I234Class A AddressNHHHClass B AddressNNHHClass C AddressNNNHAll Os in host portion = network or subnetwork addressAll 1s in host portion = broadcast addressCombination of 1s and Qs in host portion = valid host address

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