Subnetting failed
JJBladester
Member Posts: 38 ■■□□□□□□□□
in CCNA & CCENT
I am reading the Network Fundamentals (CCNA Exploration Companion Guide) from Cisco Press and am on chapter 6 which deals with addressing IPv4 networks. The book has an example on how to subnet the network 192.168.1.0/25 into two subnets with a network mask of 255.255.255.128.
When I use the online subnet calculator the book mentions, it says subnetting failed.
The site I used is VLSM CIDR Subnet Calculator
The message I got and need help interpreting is below. Why does it say that I am using 200% of available major network address space? Is that the error or is it something else?
https://picasaweb.google.com/lh/photo/YNswLYfHi36oxctnRhWaVw?feat=directlink
When I use the online subnet calculator the book mentions, it says subnetting failed.
The site I used is VLSM CIDR Subnet Calculator
The message I got and need help interpreting is below. Why does it say that I am using 200% of available major network address space? Is that the error or is it something else?
https://picasaweb.google.com/lh/photo/YNswLYfHi36oxctnRhWaVw?feat=directlink
Comments
-
Zartanasaurus Member Posts: 2,008 ■■■■■■■■■□Change the major network to /24. I don't have the book, but I have to assume they mean they want you to subnet 192.168.1.0/24 into two /25 subnets.Currently reading:
IPSec VPN Design 44%
Mastering VMWare vSphere 5 42.8% -
JamesFigueroa Member Posts: 68 ■■□□□□□□□□Not sure...your subnet is correct for the needs as far as i can tell. I wouldnt worry too much about it. For me you got subnet passed ;p
-
MosGuy Member Posts: 195On the subnet link page:
Major network: 192.168.1.0 /24
Subnet: A & B, space = 126
Number of subnets: 2 , <change> button
"Subnetting Successful" message---
XPS 15: i7-6700HQ, 256 pcie ssd, 32 GB RAM, 2 GB Nvidia GTX 960m, windows 10 Pro
Cert in progress: CCNA (2016 revision) -
JJBladester Member Posts: 38 ■■□□□□□□□□Back to the original question:
Given an address block of 192.168.1.0/24, you will create two subnets. You borrow 1 bit from the host portion by using a subnet mask of 255.255.255.128, instead of the original 255.255.255.0.
Thanks guys!