Subnetting question(s)

linuxloverlinuxlover Posts: 228Banned
Hi, I went over a Subnetting section by Chris Bryant ([email protected]) and actually now that I understand it, I feel like this is pretty simple stuff. I have started practising @ subnettingquestions.com and I already have a problem.

Question: What is the first valid host on the subnetwork that the node 172.23.80.9/21 belongs to?
Answer: 172.23.80.1


I don't understand why the answer is 172.23.80.1 and not 172.23.80.10?
grep me, grep you

Comments

  • networker050184networker050184 Posts: 11,962Mod Mod
    You need to figure out what network that address belongs to, not just start the network there.
    An expert is a man who has made all the mistakes which can be made.
  • Jon_CiscoJon_Cisco Posts: 1,602Member ■■■■■□□□□□
    The address provided is within a range. You need to translate the /21 to understand the range.

    172.23.80.0 is the network
    172.23.80.1 is the first host
    172.23.87.255 is the broadcast
    172.23.88.0 is the next network
  • linuxloverlinuxlover Posts: 228Banned
    You're right, I was asking myself the wrong question. I was calculating the IP range (as if the address was a subnet) when I should've calculated which subnet is the address on. Thanks for the hint.
    grep me, grep you
  • jayskatajayskata Posts: 97Member ■■□□□□□□□□
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