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  • Subneting and Summarization

    Tuesday, April 28th, 2009

    Subneting The process of extending the default subnet mask creates a counting range in the octet that the subnet was extended into, which can be used to represent subnetworks. This allows a single Class A, B, or C network to be subdivided into many smaller groups with each group, or subdivision treated as if it […]

    IP Address Classes and CIDR

    Tuesday, April 28th, 2009

    IP addresses are divided in to ‘classes’, based on the decimal value represented in the first octet. This class definition is referred to as the First Octet Rule. There are five classes of IP addresses: classes A, class B, class C, class D; and class E, but only class A, B and C addresses are […]