Subnetting question
I've been doing quite a bit of subnetting recently and its starting to click. But then I ran into a question with a little different format and asks a question I'm not used to.
Suppose an ISP owns the block of addresses of the
form 101.101.128/17. Suppose it wants to create four subnets from this block, with each block having the
same number of IP addresses. What are the prefixes (of form a.b.c.d/x) for the four subnets?
This is the answer it gives me:
101.101.101.64/28
101.101.101.80/28
101.101.101.96/28
101.101.101.112/28
How would you go about arriving at this answer?
Suppose an ISP owns the block of addresses of the
form 101.101.128/17. Suppose it wants to create four subnets from this block, with each block having the
same number of IP addresses. What are the prefixes (of form a.b.c.d/x) for the four subnets?
This is the answer it gives me:
101.101.101.64/28
101.101.101.80/28
101.101.101.96/28
101.101.101.112/28
How would you go about arriving at this answer?
2014 Certification Goals: 70-410 [ ] CCNA:S [ ] Linux+ [ ]
Comments
If I were to break the 101.101.128.0/17 block into four equal pieces, I would create four /19s out of it:
101.101.128.0/19
101.101.160.0/19
101.101.192.0/19
101.101.224.0/19
I would double check those as I did them in my head.
use the lammle method or google danscourses on youtube for his version. both are great and geared towards real world scenarios.
Check out this thread. http://www.techexams.net/forums/ccna-ccent/38772-subnetting-made-easy.html
Several people spent a lot of time showing the detail that you're asking for, along with other links to get more information.
Darril Gibson
Security+ blog
Security+ Tip Of Day
CompTIA A+, Network+, Security+ Blogs
Daily Network+ and Security+ Test Taking Tips on Twitter
On the subnetting made easy thread it says 5^2 is 32. I thought it was 25, is this because we are going to the 5th position in an octet I.E 16?
Just wanted to check