CCNA subnetting question

Answered Question
Oct 11th, 2007
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Going through various practice tests saw the following question.


**

you have been assigned IP address 198.150.25.0/29 and you need to configure the first available IP address on the first available subnet for the router's S0 interface and the first available address on the next available subnet for the E0 interface. Which two commands must you use to properly configure the router's S0 and E0 interfaces? (choose two


a: ip address 198.150.25.8 255.255.255.248


b: ip address 198.150.25.0 255.255.255.248


c: ip address 198.150.25.9 255.255.255.248


d: ip address 198.150.25.0 255.255.255.240


e: ip address 198.150.25.16 255.255.255.248


f: ip address 198.150.25.16 255.255.255.240


g: ip address 198.150.25.17 255.255.255.248


h: ip address 198.150.25.17 255.255.255.240


I: ip address 198.150.25.9 255.255.255.240


***


I chose C and G, which are correct.


However, shouldnt the actual answer be

ip address 198.150.25.1 255.255.255.248

and

ip address 198.150.25.9 255.255.255.248


??



I assume with a /29 being CIDR notation that this is a classless situation so the first and last subnets are not thrown out. Or am I crazy and this is a classful questions so the first subnet is thrown out and that is why they dont offer the 198.150.25.0-7 range in the possible answers?


any help on this is greatly appreciated.


thanks

Eric

Correct Answer by swmorris about 9 years 5 months ago
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Correct Answer
swmorris Thu, 10/11/2007 - 08:10
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sgregg Sat, 10/13/2007 - 10:22
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Did perhaps the question mention that IP subnet-zero was being used? If in fact IP subnet 0 was being used, the first available subnet would be the 198.150.25.8 network and yes I would agree I think you have selected the correct answers.

LordFlasheart Sun, 10/14/2007 - 07:40
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Hi,


I would make you right. Where did this practice question originate from? There are plenty out there that go way back, when Cisco didn't have ip subnet-zero enabled by default. The questions in my CCNA back in 2005 all included subnet-zero as it was on by default.


HTH,


Chris

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