DRAG DROP
Your company has a main office that contains 225 client computers. The client computers are located ona
subnet that uses the network ID of 10.10.1.0/24.
The company plans to open two branch offices. The offices will be configured as shown in the followingtable.
You need to select a network prefix for each officeto ensure that there are enough IPv4 addresses foreach
client computer. The solution must minimize the number of unused IP addresses.
Which network prefixes should you select?To answer,drag the appropriate network prefix to the correctbranch
office in the answer area.
Answer: 
Explanation:
No,
Branch 1 = /27 = 64 usable IP addresses
Branch 2 = /26 = 127 usable IP addresses
27-32= 5 bits left over for the hosts portion. 2 ^ 5 is 32 and then subtract 2. It leaves you only 30 hosts.
27 is incorrect.
26-32= 6 bits left over for the hosts portion. 2 ^ 6 is 64 and then subtract 2. it works for 50 hosts but not 100.
/27 is for 32 addr
/26 is for 64 addr
/25 is for 128 addr
Forgot to -2 for each, however the answers still stand.
1 =/25
2 =/26
Addresses Hosts Netmask Amount of a Class C
/30 4 2 255.255.255.252 1/64
/29 8 6 255.255.255.248 1/32
/28 16 14 255.255.255.240 1/16
/27 32 30 255.255.255.224 1/8
/26 64 62 255.255.255.192 1/4
/25 128 126 255.255.255.128 1/2
/24 256 254 255.255.255.0 1
/23 512 510 255.255.254.0 2
/22 1024 1022 255.255.252.0 4
/21 2048 2046 255.255.248.0 8
/20 4096 4094 255.255.240.0 16
/19 8192 8190 255.255.224.0 32
/18 16384 16382 255.255.192.0 64
/17 32768 32766 255.255.128.0 128
/16 65536 65534 255.255.0.0 256
http://www.aelius.com/njh/subnet_sheet.html
/25 for branch one
/26 for branch 2
/25 leaves 7 bits for the host id, 2^7=128 addresses and 126 usable IPv4
/26 leaves 6 bits for the host id, 2^6=64 addresses and 62 usable IPv4
25/ subnet 1
26/subnet 2
how about this
https://s15.postimg.org/xdmfjqnyz/B1_B2.png