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So a network masks helps you know which portion of the address identifies a network and which portion
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of the address identifies the node.
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An IPv4 subnet mask consists of 32 bits, a sequence of one followed by a block of zero.
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The trailing block of zeros designates that part as being the host identifier.
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Class A, B and C networks have default masks, also known as natural masks, and these masks are.
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Two five five zero zero zero for class class-A, 255.255.255.0 got zero for Class B and 255.255.255.0
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for Class C networks.
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So an IP address to a Class B network that has not been subnet.
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We'd have an address mask pair similar to one three one one zero 7.1.2 being the address and 255.255.255.0
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zero would be the subnet mask, right?
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Now, in order to see how the mask helps you identify the network and node parts of the address, convert
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the address and mask into binary numbers as seen on the slide.
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So once you have the address in the mask represented in binary.
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Then identification of the network and the host ID is a lot easier.
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Any address bits which have corresponding mask bits set to one represent the network I'd.
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And he addressed bits that have corresponding mask bits set to zero represent the host I.D..
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So in this example, the first part, one three one eight one zero seven is the network part of the
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IP address, where the rest 1.2 represents the host.
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All devices on this segment share the same network ID and the same subnet mask.
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Now you can customize the subnet mask to divide a network into many smaller portions.
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So here's a little brain Tingler for you.
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The Network ID may be expressed in classless inter domain routing or sidr notation written as the first
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address of a network followed by a slash character and ending with a bit length of the prefix.
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So in our example, one three one one zero seven eight zero zero one six is the prefix of the IPV four
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network, starting at the given address, having 16 bits allocated for the network prefix and the remaining
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16 bits reserved for host addressing.
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