IP study time

You have been allocated a Class B network address of 129.1.0.0. You have subnetted it using the subnet mask 255.255.255.0 How many networks can you Have and how many hosts can you place on each network?

the network has 8 bits and so does the node component. This means that you have have 28=256 networks and 256 -2 = 254 hosts

255.255.255.224 Subnet mask - identify number of hosts and networks

If this were put to binary, the 224 is 11100000 . The five Os makes 2 to the fifth power minus 2 = number of hosts. (30) hosts = 30 addresses =32 (giving back that minus 2)

What is subnetting?

Subnetting is the process of dividing a network into small networks and is a common task on IPV4 networks (imagine splitting a school into classrooms)

255.255.255.192 Decimal 192 =11000000 binary which means that 2 bits of this octet are used for the subnet. Now add the 24 bits 255.255.255 and we have 26 bits. So we write:

222.1.1.20/26

2. Write is the IP address 135.1.1.25 mask 255.255. 248.0 in CIDR notation

Decimal 248 =11111000 binary which means that 5 bits of this octet are used for the subnet. Now add the 16 bits 255.255. and we have 21 bits. So we write: 135.1.1.25/21

You have been allocated a class A network address of 21.0.0.0. You need create at least 10 networks and each network will support a maximum of 100 hosts. Would the following two subnet masks Work. 255.255.0.0 and or 255.255.255.0

Yes you only need 8 bits for 100 hosts and both subnet masks would give you that.