Help with figuring out this problem.

[JoseHM]

I am studying the testout course for networking, but I can't figure out how to solve some problems. Any help is appreciated. Here is a pic of one problem I cant understand.

[Oshino Shinobu]

a 29 bit subnet mask on 172.30.199 gives you a total of 6 host bits per subnet. Each network increments by 8, so you have 172.30.19.0, 172.30.199.8, 172.30.199.16 etc. 

 

The two subnets we're interested in here are 172.30.199.64 and 172.30.199.72. The former has .65 - .70 as available hosts. The latter has .73 - .78. 

 

172.30.199.70 is on the 172.30.199.64/29 subnet and 172.30.199.78 is on the 172.30.199.72/29 subnet, so Wrk2 cannot communicate with its default gateway. You could change Wrk2 to .65 - .69

[mtz_federico]

Are there any advantages to using smaller subnet masks besides being able to have way more subnets?

[dalekphalm]

7 hours ago, mtz_federico said:

Are there any advantages to using smaller subnet masks besides being able to have way more subnets?

None that I'm aware of - you have "smaller" masks to segment the IP range into more subnets - which can be useful for security and/or organizational things.