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Go Back   Lammle Forum > Todd Lammle Study Guides: Dynamic Updates > Todd Lammle's CCNA Study Guide Dynamic Updates > Chapter 9: EIGRP and OSPF
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Old 11-27-2011, 04:05 PM
ciscodaze ciscodaze is offline
 
Join Date: Dec 2010
Location: Left Coast, California
Posts: 306
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Quote:
Originally Posted by pcameron1 View Post
Good advice thank you Ciscodaze. I have one more question.

If we had this ip as a question ..... 172.21.96.0/20

Am I correct, the wildcard mask = 0.0.15.255

that would be the correct conversion for /20...the particular IP given will result is the range of 192.21.96.0 - 192.21.111.255

But that may not be the correct answer for a question...say they were asking you to indicate a range of subnets that would give you 6 subnets.
For that all you would need is a /21, or 0.0.7.255 wildcard

you can practice with a wildcard calculator here
http://www.subnet-calculator.com/wildcard.php
__________________
Kevin NET+SEC+A+CCNA
'All that is not eternal is eternally out of date' ~ C.S. Lewis

Last edited by ciscodaze; 11-27-2011 at 04:09 PM.
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