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Hey Dieselboy,

Thanks for the help! Really appreciate the explanation and the pic you shared.
So.... Here's my understanding before I relay it to the rest of the peanut gallery.


1.) When the question states that the NEW subnet should use a 28-bit mask,
- I subtracted 16 from 80 in 10.0.155.*80*     
(because /28 the subnets are increments of 16)
- I'm left with 10.0.155.64/28       
(now with this info, moving on to the next part to replace the static route)
- I think I got this part down and digested in my brain.

2.) For the static route, I don't know where to begin to find why the mask is /27
- but my first clue is 10.0.155.64 and 10.0.155.80 from part 1
(need to include the old and new network)

- I understand /27 goes by increments of .32  , therefore..... 32 -> 64 -> 96

- so I know 10.0.155.64 in both /27 and /28 begin their subnet at .64

***now this part below, I need this part validated by an expert***

- If 10.0.155.64 /27 has a range of .64 through .95, it also includes 10.0.155.*80* (thus the old network)
- Being that it is in range, this would be the right answer?


3.) 10.0.155.80 /26 or /27 wouldn't work because the increments of the subnets in dotted decimal doesn't allow for .80?!

/26 = 0, 64, 128 ..... NO 80!
/27 = 0, 32, 64, 96 ..... NO 80!

(man... I get anxiety when having to answer, hahaha)

Hi everyone, I'm new to the forums here. I'm currently studying Computer Networking Technology and we're using the Testout Corporation's materials to study. (We're studying at Renton Tech)

The class and myself are having a difficult time answering this question about what subnets to add, but especially why are the answers are the way they are. We'd appreciate the help! Thank you!

(the answer explanation, doesn't really help us... we really need help from anyone who could explain more simply)