This week in class we have been studying IPv4 and subnetting.
Thankfully I have spent a lot of time practicing subnetting while studying for the Network+, so I have some experience here.
Most of what we went over was fairly basic, playing around with different CIDR notations and working out the binary to decimal translations of the IP addresses and subnets. It was good to revise what I already know, and it helped cement the knowledge of subnetting in my mind.
The main thing I learned was how to work out how many subnets there are in a network. Previously, I was using a chart that I had memorized in my head, but this was only useful for /24 for above, so when we were challenged with /18 and /12, it was a bit more difficult to figure out. Once I had remembered the ‘n to the number of host/network bits’ it became a lot easier to figure out the amount of hosts to subnets and etc.
The chart I used was from my previous studies, I went back through my book that I was using for study at the time and found it, it looks like this.
I also found another relevant chart from that book.
It’s been great to revisit the learning and knowledge that I gained previously when I was just starting out learning networking, it makes a lot more sense this time around.
Subnetting Example
We have been asked to demonstrate some basic examples of subnetting to show our understanding. I will do so below. From the given IP, work out the IPv4 settings and subnet masks of the different subnets.
IPv4 Address: 10.10.3.1/18
Mask (Decimal): 255.255.192.0
nnnnnnnn.nnnnnnnn.ss hhhhhh.hhhhhhhh
Subnet 1
Usable IP’s: 10.10.0.1–10.10.63.254
Network Address: 10.10.0.0,
Broadcast Address: 10.10.63.255,
Subnet 2
Usable IP’s: 10.10.64.1–10.10.127.254,
Network Address: 10.10.64.0,
Broadcast Address: 10.10.127.255,
Subnet 3
Usable IP’s: 10.10.128.1–10.10.191.254,
Network Address: 10.10.128.0,
Broadcast Address: 10.10.191.255,
Subnet 4
Usable IP’s: 10.10.192.1–10.10.255.254,
Network Address: 10.10.192.0,
Broadcast Address: 10.10.255.255,
