![]() In this activity, starting from a single network address and network mask, you will subnet the Customer network into multiple subnets. /30 row – Borrowing 6 bits creates 64 subnets supporting 2 hosts each.Ĭlick Play to view an explanation of the subnet mask.Ĭlick Play to view an explanation of the magic number./29 row – Borrowing 5 bits creates 32 subnets supporting 6 hosts each./28 row – Borrowing 4 bits creates 16 subnets supporting 14 hosts each./27 row – Borrowing 3 bits creates 8 subnets supporting 30 hosts each./26 row – Borrowing 2 bits creates 4 subnets supporting 62 hosts each./25 row – Borrowing 1 bit from the fourth octet creates 2 subnets supporting 126 hosts each.Subnet a /24 Network Prefix Lengthįor each bit borrowed in the fourth octet, the number of subnetworks available is doubled, while reducing the number of host addresses per subnet: Refer to the table to see six ways to subnet a /24 network. This provides the administrator with additional flexibility when assigning network addresses to a smaller number of end devices. However, subnets can borrow bits from any host bit position to create other masks.įor instance, a /24 network address is commonly subnetted using longer prefix lengths by borrowing bits from the fourth octet. ![]() The examples shown thus far borrowed host bits from the common /8, /16, and /24 network prefixes. ![]() Subnetting Network 10.0.0.0/8 using a /24 Prefix Subnet Address The /24 boundary is very popular in subnetting because it accommodates a reasonable number of hosts and conveniently subnets at the octet boundary. This would enable the enterprise to define 65,536 subnets each capable of connecting 254 hosts. Subnetting Network 10.0.0.0/8 using a /16 Subnet AddressĪlternatively, the enterprise could choose to subnet the 10.0.0.0/8 network at the /24 octet boundary, as shown in the table. Subnet Mask in Binary (n = network, h = host) Subnet Masks on Octet Boundaries Prefix Length Notice that using longer prefix lengths decreases the number of hosts per subnet. The table identifies these prefix lengths. Networks are most easily subnetted at the octet boundary of /8, /16, and /24. The more bits that are borrowed to increase the number of subnets reduces the number of hosts per subnet. The more host bits that are borrowed, the more subnets that can be defined. This is done by extending the subnet mask to borrow some of the bits from the host portion of the address to create additional network bits. IPv4 subnets are created by using one or more of the host bits as network bits. It is a bit daunting at first, but it gets much easier with practice. ![]() Subnetting is a critical skill to have when administering an IPv4 network. You also learned that segmenting a network is called subnetting. In the previous topic you learned several good reasons for segmenting a network. Subnetting Network 10.0.0.0/8 using a /24 Prefix. ![]()
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