Free Subnetting Lesson - 3
Subnetting Lesson 3
How did you get along with writing out the
Subnetting Secrets Cheat
Sheet? It should only take a few goes to be able to write it
out from
memory. That is actually the question half answered already
would you
believe.
Still here? You must really want to
learn subnetting.
Lets jump into another subnetting question. Still a nice easy
one for
you but then again, when you use the Subnetting Secrets method there
is
no such thing anymore as a hard subnetting question anymore.
You simply
tick the boxes and get the answer.
Which subnet is host 200.200.9.124/28 in?
Write out a Subnetting Cheat Sheet by hand.
Step 1 - We want to turn that /28 into a subnet mask.
We know that
this is another Class C address because it starts with 200. We
also
know that the mask has 28 bits in so write out up to 24 bits:
255.255.255 is 24 bits and we need to add 4 to get to 28. Tick
down
4 places on the upper left column.
| 128 |
 |
| 192 |
|
| 224 |
|
| 240 |
|
| 248 |
|
| 252 |
|
| 254 |
|
| 255 |
|
We get 240 for the last octet so our mask is 255.255.255.240
Step 2 - tick across the top row 4 places to get our subnet
increment.
Our subnets are going up in increments of 16 and our host number is
124 because we are subnetting on the last octet.
Step 3 - write out the subnets until you hit the one the host
is in.
200.200.9.0 not in this one so add 16
200.200.9.16 not in this one so add 16
200.200.9.32 not in this one so add 16
200.200.9.48 not in this one so add 16
200.200.9.64 not in this one so add 16
200.200.9.80 not in this one so add 16
200.200.9.96 not in this one so add 16
200.200.9.112 YES. Host 124 is in
here
200.200.9.128
The answer is 200.200.9.112.
We will have a harder question tomorrow. If you can't wait
until then Paul please rush over to the below link
and grab yourself a copy of Subnetting Secrets. There are
lots more examples in there where I hold you hand and walk
you through more examples than you will ever need.
http://www.subnetting-secrets.com/buy_subnetting_secrets.html
Or it is given away to all members of
http://www.howtonetwork.net which is a unique Cisco CCNA online
training site I have created.
Until tomorrow.
Or call us on the toll free numbers at the top.
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