Cisco Certification Help with manual summarization question required.

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Subject Author Date
Help with manual summarization question required. Jason 04-23-08
Posted by Jason on April 23, 2008, 6:23 am
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Can anyone explain the answer to this Boson ICND2 question, the question
states:

An engineer has implemented manual route summarisation with EIGRP in which
the one summary route is 172.16.128.0/19. Another engineer needs to install
a new VLAN & subnet. The following are some of the subnet numbers being
considered by the second engineer for the new subnet. Which one lists a
subnet that would not be represented as part of the existing summary route?

A. 172.16.144.0/28

B. 172.16.164.160/28

C. 172.16.180.0/28

D. 172.16.124.0/28

E. 172.16.152.128/28

The answers are B & C but D also does not overlap? The explanation states
that the summary route represents the following range of numbers:

172.16.128.0 - 172.16.159.255

The answers represent:

172.16.144.0/28: 172.16.144.0 - 172.16.144.15

172.16.152.128/28: 172.16.152.128 - 172.16.152.143

172.16.164.160/28: 172.16.164.160 - 172.16.164.175

172.16.180.0/28: 172.16.180.0 - 172.16.180.15

172.16.124.0/28: 172.16.124.0 - 172.16.124.15

What am I missing?

Posted by PSK on April 24, 2008, 8:42 am
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you are correct jason ..
/19 --> 32 blocksize ... 172.16.128.0 -- 172.16.159.255

since D is only / 28 --> 16 block size .. 172.16.124.0 -- 172.16.124.15
which does not over lap.

if your book has a website, i'd check there for corrections... it happens
from time to time.. its all good.. you are not crazy ..



> Can anyone explain the answer to this Boson ICND2 question, the question
> states:
>
> An engineer has implemented manual route summarisation with EIGRP in which
> the one summary route is 172.16.128.0/19. Another engineer needs to
> install
> a new VLAN & subnet. The following are some of the subnet numbers being
> considered by the second engineer for the new subnet. Which one lists a
> subnet that would not be represented as part of the existing summary
> route?
>
> A. 172.16.144.0/28
>
> B. 172.16.164.160/28
>
> C. 172.16.180.0/28
>
> D. 172.16.124.0/28
>
> E. 172.16.152.128/28
>
> The answers are B & C but D also does not overlap? The explanation states
> that the summary route represents the following range of numbers:
>
> 172.16.128.0 - 172.16.159.255
>
> The answers represent:
>
> 172.16.144.0/28: 172.16.144.0 - 172.16.144.15
>
> 172.16.152.128/28: 172.16.152.128 - 172.16.152.143
>
> 172.16.164.160/28: 172.16.164.160 - 172.16.164.175
>
> 172.16.180.0/28: 172.16.180.0 - 172.16.180.15
>
> 172.16.124.0/28: 172.16.124.0 - 172.16.124.15
>
> What am I missing?


Posted by Jason on April 24, 2008, 5:16 pm
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> you are correct jason ..
> /19 --> 32 blocksize ... 172.16.128.0 -- 172.16.159.255
>
> since D is only / 28 --> 16 block size .. 172.16.124.0 --
> 172.16.124.15 which does not over lap.
>
> if your book has a website, i'd check there for corrections... it
> happens from time to time.. its all good.. you are not crazy ..
>
>
>
>> Can anyone explain the answer to this Boson ICND2 question, the
>> question states:
>>
>> An engineer has implemented manual route summarisation with EIGRP in
>> which the one summary route is 172.16.128.0/19. Another engineer
>> needs to install
>> a new VLAN & subnet. The following are some of the subnet numbers
>> being considered by the second engineer for the new subnet. Which one
>> lists a subnet that would not be represented as part of the existing
>> summary route?
>>
>> A. 172.16.144.0/28
>>
>> B. 172.16.164.160/28
>>
>> C. 172.16.180.0/28
>>
>> D. 172.16.124.0/28
>>
>> E. 172.16.152.128/28
>>
>> The answers are B & C but D also does not overlap? The explanation
>> states that the summary route represents the following range of
>> numbers:
>>
>> 172.16.128.0 - 172.16.159.255
>>
>> The answers represent:
>>
>> 172.16.144.0/28: 172.16.144.0 - 172.16.144.15
>>
>> 172.16.152.128/28: 172.16.152.128 - 172.16.152.143
>>
>> 172.16.164.160/28: 172.16.164.160 - 172.16.164.175
>>
>> 172.16.180.0/28: 172.16.180.0 - 172.16.180.15
>>
>> 172.16.124.0/28: 172.16.124.0 - 172.16.124.15
>>
>> What am I missing?
>
>

Thanks for putting my mind at ease, it made no sense to me.

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