Subnet question for finding subnet mask

SurferdudeHB

Is this method efficient?

Question: You are designing a subnet mask for the 192.168.55.0 network. You want 2 subnets with up to 110 hosts on each subnet. What subnet mask should you use?
Answer: 255.255.255.128


Here's how I get the answer,

1. 192.168.55.0 is a C class there for this will be on the last octect
2. 2 subnets will require 1 bit from 128 64 32 16 8 4 2 1
3. Therefore the mask is 255.255.255.128

alan2308

Efficient is a very subjective term. If what you're doing leads you to the correct answer and makes the most sense to you, then keep doing what you're doing.

MosGuy

There are various ways to subnet & arrive at the correct answer. Everyone is different, there isn't just one efficient method. Don't get caught up in trying to learn various method's. Many end up confusing themselves further. Chose one method & stick with it

Tinov

Do whatever works for you.

There are some practice subnetting questions at Free CCENT questions

mella060

So you need 110 hosts per subnet...then you would just work out that you would need 7 host bits...

2^7-2 = 126

2^6-2 = 62 which is not enough

Two subnets means you just need 1 bit in the last octet...2^1 = 2

10000000