1 Exercise: IPv4 subnetting. 2 Task 1 Given is an IP network with address 194.141.0.0: Divide this network into 8 subnets.

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Presentation transcript:

1 Exercise: IPv4 subnetting

2 Task 1 Given is an IP network with address : Divide this network into 8 subnets.

3Solution l This network is class C because the starting bits are 110. l In binary form: l The first 3 octets represent the network address. The fourth octet is for subnet and host address.  We need a subnet mask with 3 bits ones, because 8 = 2 3 : l In decimal form:

4Comments l We use this mask in the corresponding field of the IP configuration. l The available subnets have the following addresses: Can not be used. In fact we have 6 real subnets. Hosts with address 0 or 255 can not be used. Therefor each subnet contains up to 256/8 - 2 = 30 hosts.

5 Task 2 Given is an IP network with address : Divide this network into 32 subnets.

6Solution l The subnet mask is l in decimal: l 30 subnets with up to 2046 hosts each.

7 Task 3 l Given is a subnet mask: l Which class is the network? l How many real subnets? l How many real hosts may contain each subnet?

8Solution l This is a subnet mask for network class A. l There are 2 7 – 2 = 126 real subnets. l Each subnet may has up to 2 17 – 2 = real hosts.