CCNA Cisco Certified Network Associate Study Guide - FTP Server

3. 256–192=64. 64+64=128.
Subnetting 147
4. First find the broadcast addresses in step 5, then come back and perform
step 4 by filling in the host addresses.
5. Find the broadcast address of each subnet, which is always the number
right before the next subnet.
The following table shows the two subnets available, the valid host range,
and the broadcast address of each.
Subnet 64.0 128.0
First Host 64.1 128.1
Last Host 127.254 191.254
Broadcast 127.255 191.255
Notice we just added the fourth octet’s lowest and highest values and
came up with the answers. Again, it is the same answer as for a Class C subnet,
but we just added the fourth octet.
Practice Example 2: 255.255.240.0
172.16.0.0=Network address
255.255.240.0=Subnet address
1. 2 4 –2=14.
2. 2 12 –2=4094.
3. 256–240=16, 32, 48, etc., up to 224. Notice these are the same numbers
as a Class C 240 mask.
4. First find the broadcast addresses in step 5, then come back and perform
step 4 by filling in the host addresses.
5. Find the broadcast address of each subnet, which is always the number
right before the next subnet.