Subnet Speed Practice #2: Answers
By certskills
This post makes no sense without reading this post first. The earlier post lists 5 subnetting problems, and tells you to time yourself. The answers are below the fold in this post. Don’t look til you try it for yourself! Post questions if you have them.
| Problem | Network Bits | Subnet Bits | Host Bits | # Hosts |
| 10.1.1.1/23 | 8 | 15 | 9 | 510 |
| 172.16.203.203/25 | 16 | 9 | 7 | 126 |
| 192.168.1.161/29 | 24 | 5 | 3 | 6 |
| 10.1.99.101/26 | 8 | 18 | 6 | 62 |
| 172.16.77.177/27 | 16 | 11 | 5 | 30 |
| Subnet ID | 1st Addr. | last Addr. | B’cast | |
| 1 | 10.1.0.0 | 10.1.0.1 | 10.1.1.254 | 10.1.1.255 |
| 2 | 172.16.203.128 | 172.16.203.129 | 172.16.203.254 | 172.16.203.255 |
| 3 | 192.168.1.160 | 192.168.1.161 | 192.168.1.166 | 192.168.1.167 |
| 4 | 10.1.99.64 | 10.1.99.65 | 10.1.99.126 | 10.1.99.127 |
| 5 | 172.16.77.160 | 172.16.77.161 | 172.16.77.190 | 172.16.77.191 |
By certskills
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Is 2min per question too slow?
Took me 12 min – 30 sec; practice makes perfect!
Will keep at it!
James – that is the right attitude!
Helps to do a little every day! Do it!
Have fun, hope you’re sticking with it!
Wendell
It took me 8 mins. I am going to keep practicing
192.168.1.161/29
is broadcast address right
isn’t it should be 192.168.1.163
Hello Parvesh
/29 – 255.255.255.248
256 – 248 = 8
192.168.1.160 – Network address
192.168.1.161 – 1st host
192.168.1.166 – last host
192.168.1.167 – Broadcast