Definitions for teachers by teachers
Subnetmask
Subnetmask- Also known as an Address Mask. The subnet mask identifies parts of an IP address that correspond to the different sections (separated by dots). This helps us locate what we are looking for on the internet. Very similar to a phone number.by Sarah Barnett
A number used to identify a subnetwork so that an IP address can be shared on a LAN (Local Area Network). A mask used to determine what subnet an IP address belongs to. An IP address has two components, the network address and the host address. For example, consider the IP address 150.215.017.009. Assuming this is part of a Class B network, the first two numbers (150.215) represent the Class B network address, and the second two numbers (017.009) identify a particular host on this network.
Necessary? Yes
This has been particularly helpful to me. I have changed, recorded,
checked many IP addresses over the last two year period. The teachers
have asked what it really is. I have always relpied, "I don't know,
but it is important." Now I know the real answer to give!
by Zan Brixey
Subnet Mask (sub' net mask): A subnet mask is the method for splitting Internet protocol (IP) networks into a series of subgroups, or subnets. A mask is used to determine what subnet an IP address belongs to. An IP address has two components, the network address and the host address. Subnetting allows the network administrator to divide the host part of the address into two or more subnets. The mask is a binary pattern that is matched up with the IP address to turn part of the host ID address field into a field for subnets. The subnet mask is the network address plus the bits reserved for identifying the subnetwork. It is called a mask because it can be used to identify the subnet to which an IP address belongs.
Relevance: A saavy network administrator can economically set up subnetwork masks so that IP addresses can be shared.
by Becky Trieger
NetHandbook Glossary | NetHandbook Home page
Last updated: 31 July 2000