Vlsm and Summariration

mister_417

i have ip address 172.0.0.16/16
Company need to devide to 30,100,500,5 how can do this?And afte summariration.

Uriah7

I don't understand the question. Can you clarify please?

mister_417

No problem.Company have ip adrress 172.0.0.16/16 and divided 25/50/100 host.

pinkiaiii

ok so you need to subnet given network that would have 500/100/50/30 hosts with 172.16.0.0/16 ip i presume not 0.0.16

so first look at largest subnet needed which is 500.

thus to get to 500 we need mask of /23 or 255.255.254.0
first ip 172.16.0.1-172.16.1.255 second subnet starts from 2.0-first ip 2.1 to 3.255 magic number [2]

next wee need 100 hosts so lets take second subnet which is 172.16.2.0 /25 [magic number 128] this gives us range 0f 2.1-1.127 and 129 to 255 and if going further 3.1to 3.127

and say we need 50 so we can use second subnet of 172.16.2.128 /26 [magic number block etc=64]thus first range would be 172.16.2.129 to 2.191

to summarize these routes -difference appears on 3rd octet so that we start to break into binary and mark off where difference appears which is 6th bit.
172.16.0.0 /23 0000.0000
172.16.2.0 /25 0000.0010
172.16.2.128 /26 0000.0010

result 172.16.0.0 with /22 or 255.255.252.0

I didnt explain how i did all that buts its taking bits from left to right to with pretty tight squeeze ,if its 100,50,25 then masks would be /25 ,/26,/27 only throw off here is class b address. hopefully someone can explain that better to you. my breakdown.

mister_417

Thank you!