question on subnetting....

in CCNA & CCENT
I've been practicing some subnetting on subnettingquestions.com - Free Subnetting Questions and Answers Randomly Generated Online and I'm a bit confused on an answer they had to a question.
Question was: What valid host range is the IP address 192.168.155.4 255.255.255.248 a part of?
Their answer: 192.168.155.1 through to 192.168.155.6
Now, I came up with 192.168.155.1 - 192.168.155.7. The IP ranges should be every 8 IP addresses, so you have an initial range of 192.168.155.0 - 192.168.155.8. You can't use the first or last IP.
What am I missing here?
Question was: What valid host range is the IP address 192.168.155.4 255.255.255.248 a part of?
Their answer: 192.168.155.1 through to 192.168.155.6
Now, I came up with 192.168.155.1 - 192.168.155.7. The IP ranges should be every 8 IP addresses, so you have an initial range of 192.168.155.0 - 192.168.155.8. You can't use the first or last IP.
What am I missing here?
Comments
0 8 16 24 etc
1 9 17 25 1st usable
6 14 22 30 last usable
7 15 23 31 broadcast
you cant use the actual subnet number ie 0, 8, 16 and you cant use the broadcast for each subnet ie 7, 15 etc.
192.168.155.0
192.168.155.8
192.168.155.16
etc.
therefore:
192.168.155.0 (subnetwork address, not assignable)
192.168.155.1 (valid address, assignable)
.
.
192.168.155.6 (valid address, assignable)
192.168.155.7 (broadcast address, not assignable)
192.168.155.8 (next subnet address)
Hope thias helps
CCIE R&S - using INE workbooks & videos
Currently reading:
Everything. Twice
Take out the network address and broadcast address and you have the host addresses that match the answer given by subnettingquestions.com
Nope ... You thought initial range was 0 .. 8
It isnt, 8 is the start of the next subnet.
Thing about subnetting is you get loads of shin bruises where you keep having to kick yourself
Don't worry, I really struggled with subnetting at first, then literally one night while thinking about it - it all just clicked.
When it does click, you will think that you where stressing for no reason.
Just keep at it.
CCIE R&S - using INE workbooks & videos
Currently reading:
Everything. Twice