DRAG DROP
You plan to deploy a DHCP server that will support four subnets. The subnets will be configured as shown in
the following table.
You need to identify which network ID you should use for each subnet.
What should you identify?
To answer, drag the appropriate network ID to the each subnet in the answer area.
Answer: 
Explanation:
50 – /26
110 – /25
400 – /23 –
525 – /22 – /22 allows 254+254+256
/24 = 255.255.255.0 = 256 IPs less network(0), broadcast=255
/25 = 256/2 = 128
/26 = 64
/23 = 256+256
i have a simple way to calculate it:
you subtract the subnet mask number from 32 meaning:
32-26(the first drag&drop option)=6 –>that means 6 bits for the host.
open a binary calculator and type 111111 you’ll get 63 addresses minus 2 for the net id and broadcast you have 61 available addresses and it fits subnet1 who needs only 50 hosts.
that’s it. easy
In a /26 there are 62 not 61 usable addresses.
111111 = 63. 0 – 63 = 64 addresses. 0 for network address and 63 for broadcast > 62 IP’s available for clients.
Open a scientific calculator – type 2 – select x to the y function – type amount of bits for private part – press = 😛
It should be Open a scientific calculator – type 2 – select x to the y function – type amount of bits for private part – press enter or = xxxx minus 2=
i.g. Open a scientific calculator – type 2 – select x to the y function – 6 (bits for private part) press = or “enter”=64-2=62