Term
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Definition
| A 32-bit binary number, usually written in dotted decimal format whose purpose is to define the structure on an IP address. It defines the size of the host part of the address, representing the host part of the IP address with binary 0s in the mask. |
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Term
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Definition
| An IP address that is part of a registered network number, asassigned by an Internet Assigned Numbers Authority (IANA) member agency, so that only the organization to which the address is registered is allowed to use the address. Routers in the Internet should have routes allowing them to forward packets to all the _______. |
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Term
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Definition
| IP addresses in several Class A, B, and C networks that are set aside for use inside private organizations. These addresses, as defined in RFC 1918, are not routable through the Internet. |
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Term
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Definition
| A math operation performed on a pair of one-digit binary numbers. The result is another one-digit binary number. 1 AND 1 yields 1; all other combinations yield a 0. |
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Term
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Definition
| A Boolean AND between two numbers of the same length in which the first bit in each number is ANDed, and then the second bit in each number, and then the third, and so on. |
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Term
| Prefix Notation / CIDR Notation |
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Definition
| A shorter way to write a subnet mask in which the number of binary 1s in the mask is simply written in decimal. For instance, /24 denotes the subnet mask with 24 binary 1 bits in the subnet mask. The number of bits of value binary 1 in the mask is considered to be the prefix length. |
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Term
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Definition
| For every classful IPv4 network that is subnetted, the one subnet whose subnet number has all binary 0s in the subnet part of the number. In decimal, the zero subnet can be easily identified because it is the same number as the classful network number. |
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Term
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Definition
| When subnetting a Class A, B, or C network, the one subnet in each classful network for which all subnet bits have a value of binary 1. The subnet broadcast address in this subnet has the same numeric value as the classful network’s network-wide broadcast address. |
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Term
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Definition
| The subnet in which an IP address resides. |
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Term
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Definition
| A special address in each subnet, specifically the largest numeric address in the subnet, designed so that packets sent to this address should be delivered to all hosts in that subnet. Also called directed broadcast address. |
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Term
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Definition
| An IPv4 Class A, B, or C network; called a classful network because these networks are defined by the class rules for IPv4 addressing. |
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Term
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Definition
| The mask used in a Class A, B, or C network that does not create any subnets; specifically, mask 255.0.0.0 for Class A networks, 255.255.0.0 for Class B networks, and 255.255.255.0 for Class C networks. |
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Term
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Definition
| Subdivisions of a Class A, B, or C network, as configured by a network administrator. Subnets allow a single Class A, B, or C network to be used instead of multiple networks, and still allow for a large number of groups of IP addresses, as is required for efficient IP routing. |
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Term
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Definition
| A 32-bit number that numerically describes the format of an IP address by representing the combined network and subnet bits in the address with mask bit values of 1, and representing the host bits in the address with mask bit values of 0. |
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Term
| Subnet Number/ Subnet Address |
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Definition
| In IP v4, a dotted decimal number that represents all addresses in a single subnet. Numerically, the smallest value in the range of numbers in a subnet, reserved so that it cannot be used as a unicast IP address by a host. |
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