Subnetting question

I'm using the Transcender study materials and I keep running into a question similar to this:

PC1 IP: 192.168.199.64
PC2 IP: 192.168.204.31

What is the most restrictive subnet mask that can be used in this configuration.

How do you calculate the subnet mask based on these parameters?

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Comments

Gundamtdk

Do you have the full question?

The question should tell you the number of bytes used for the subnet like:

192.168.20.0 / 22

dynamik

147 wrote:

How do you calculate the subnet mask based on these parameters?

Essentially, you just keep removing host bits until you get an address range that encompasses both values. It's been awhile, but I don't remember getting any serious subnetting questions on 270. I don't think you're going to any questions like that on the actual exam.

147

Gundamtdk wrote:

Do you have the full question?

The question should tell you the number of bytes used for the subnet like:

192.168.20.0 / 22

Actually, no, it just lists the two IP addresses and wants to find the most restrictive subnet mask. I've seen three examples of it in the Transcender package. If it told me the number of bits, I might have been able to figure it out, though.

dynamik: I see where you're going and I think I can figure it out based on what you're saying. Also, its good to know that's one subject that won't be on the exam (sortof seems like that's the only subject that won't be covered, though

girt81

didn't realize there was any subnetting on the 70-270. There's a ton of info on it in CCNA material though if you need it.

It looks like it would fit in 192.168.192.0/20 (192.168.192.1 - 192.168.207.254) which would be a subnet mask of 255.255.240.0

The range is small enough to fit in a 255.255.248.0 subnet, but it overlaps across 2 of those subnets. 192.168.192.0/21 and 192.168.200.0/21, or [192.168.192.1 - 192.168.199.254] and [192.168.200.1 - 192.168.207.254]

subnetting was never a strong point so i hope that's right

BigTone

I think as long as you understand the concept of subnetting on the 270 you'll be fine.

Understand if you have 192.168.0.1 and 192.168.0.15 what subnet they sit on, etc.