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This Question is Answered 1 Correct Answer available (4 pts) 2 Helpful Answers available (2 pts)
2167 Views 2 Replies Latest reply: Sep 1, 2010 3:07 PM by FernandoDias RSS

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VLSM Overlap doubt

Sep 1, 2010 11:29 AM

FernandoDias 46 posts since
Jan 9, 2009

Hi All,

 

I am studying for my CCNA Certification and I have a doubt about VLSM.

 

Take a look at the question:

 

R1 has configured interface Fa0/0 with the ip address 10.5.48.1 255.255.240.0
command. Which of the following subnets, when configured on another interface on
R1, would not be considered to be an overlapping VLSM subnet?
a. 10.5.0.0 255.255.240.0
b. 10.4.0.0 255.254.0.0
c. 10.5.32.0 255.255.224.0
d. 10.5.0.0 255.255.128.0

 

In the book, the answer to this question is as follows:

 

C and D. Subnet 10.5.0.0 255.255.240.0 implies range 10.5.0.0–10.5.15.255, which
does not overlap. 10.4.0.0 255.254.0.0 implies range 10.4.0.0–10.5.255.255, which
does overlap. 10.5.32.0 255.255.224.0 implies range 10.5.32.0–10.5.63.255, which
does overlap. 10.5.0.0 255.255.128.0 implies range 10.5.0.0– 10.5.127.255, which
does overlap.

 

I thought the right answer was letter A. Am I wrong? Or I didnt understand the question?

I am using ICND2, Wendell Odom, PDF VERSION.

 

Best Regards,

 

Fernando

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