an IP address. Otherwise, the addresses are assignable to an interface.
CCNA exam questions you about IP in many different ways. The question in the heading of this
section is unlikely to be the exact question, however. You should expect to see something like,
"Which of the following are valid subnets of network X, using mask Y?," followed by the
suggested answers. If you can figure out all the subnets of that network, you should be able to
answer the multiple-choice exam question easily.
network part of the subnet numbers.
subnet part of the subnet numbers.
is the subnet part of the subnet number. The network and host parts are identical. An example
helps in this case. Examine Figure 5-23, which shows a familiar network with six subnets.
implying two network octets, one subnet octet, and one host octet. The subnets already used in
this example are as follows:
subnet number. In fact, simply counting sequentially, subnet numbers continue--150.150.7.0,
150.150.8.0, and so on, up through 150.150.254.0. That gives a total of 254 subnets, assuming
that the zero and broadcast subnets are not used.