Routers configured with a classful ip addresses do not include subnet mask information with routing updates, the router assumes its own subnet mask or defaults to the classful subnet mask. The first three octets identify the network portion of the address while the last octets are for the host portion of IP addresses while using /24 prefix.Ĭlassful subnetting uses the default Class A, B or C networks including the default mask for its classes (A, B, C). Using a /24 subnetting, it can provide 65536 sub-networks (i.e., 120. You can also subnet the /8 prefix network into the /24 octet boundary as shown in Figure below. The figure below illustrates the subnetting of /8 network into /16 network. The first two octets with /16 prefix length identify the network portion of the address and the last two octets are for the host portion of IP addresses. You can further subnet the network 120.0.0.0/8 address at the octet boundary of /16 as shown in Figure below. This is a large network with a large broadcast causing slow network performance. The number of hosts in the network is 16,777,214. Suppose you have and IP network 120.0.0.0/8 in a single broadcast domain. For understanding the subnetting on the octet boundaries examine the following example. Subnetting on the octet boundary is very easy which also known as classful subnetting. The longer prefix lengths mean less number of hosts per network. The table also identifies the network and host bits including the number of hosts each subnet can connect. The table below identifies the prefix lengths as well as subnet masks equivalent to prefix. Networks subnetting at octet boundaries are too easy. We can subnet a network either a classful subnet or classless subnet.īorrowing more host bits can define more sub-networks. As we already learn that IPv4 address has 4 octets and the octet boundaries are predefined which /8, /16, and /24. For IPv4 subnetting we borrow host bits and using them as network bits for creating supplementary networks calling sub-networks. The prefix length and the subnet mask are different ways of identifying the network portion of the IP address. IP address is used to uniquely identify the router or device in the network and the subnet mask identify the broadcast of the network. Classful AddressingĮach router interface connected to a network is required IP address and subnet mask. The classful address has third part between the network and host part, namely the subnet part of the address containing a barrowed bits. The end of both the address type has a host part that uniquely identifies each host inside a network or sub-network. With classful addressing, the address always has an /8, /16, or /24 bit network prefix, based on the Class A, B, and C addressing rules. Classless addressing has two-parts wiev, and classful addressing has a three-part view. Classful and Classless addressing both terms refer to a viewpoint on the structure of a subnetted IP address.
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