TAILIEUCHUNG - Solving the Mysteries of Subnetting

Subnetting is a complicated topic that has confused students for a very long time. However, subnetting is an important topic for many different certifications with various vendors, including Cisco. In the real world environment, people are used to just punching in the numbers in many of the free subnet calculators that are readily available on the internet. For exam purposes, you still have to do this in a very fast manner since many exams are time-based and you don’t have the luxury of spending those precious minutes on any single question. This whitepaper will solve some of those age-old and. | Global Knowledge Expert Reference Series ofWhite Papers Solving the Mysteries of Subnetting 1-800-COURSES Solving the Mysteries of Subnetting Raj Tolani Global Knowledge Instructor Introduction Subnetting is a complicated topic that has confused students for a very long time. However subnetting is an important topic for many different certifications with various vendors including Cisco. In the real world environment people are used to just punching in the numbers in many of the free subnet calculators that are readily available on the internet. For exam purposes you still have to do this in a very fast manner since many exams are time-based and you don t have the luxury of spending those precious minutes on any single question. This whitepaper will solve some of those age-old and complicated subnetting puzzles. Why Do We Subnet Why can t you take the numbers provided by the providers The answer is simple - because YOU know your network your provider doesn t. Only you know the details such as how many users you would want in each network. Only you know how many of these networks sub-networks broadcast domains you need. Various design classes will give you different specs on how big the broadcast domain should be answer depending on the application needs you have . We also do subnetting because you might want to create a manageable doable and realistic set of numbers rather than the defaults which might not work for your needs or could be overkill. Note Each router interface is its own broadcast domain since routers by default terminate broadcasts. Also VLAN broadcast domain since you need a L3 device router to interconnect different broadcast domains Vlans subnets. Yes subnets broadcast domain vlan. We use these terms interchangeably but subnet is a L3 concept and vlan is a L2 concept. There are three classes of addresses that we use for unicast one-to-one communication purposes in our IPv4 network 32 bit addresses Class A Class B and Class .

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