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cisco question

Hello, I'm studying for the CCENT exam. I'm working on a bunch of practice questions, and I've come across the one that is attached and I can't figure out why answer B is the correct answer. Can someone please explain. Please see attached.
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MrMay
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MrMay
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1 Solution
 
agonza07Commented:
Looks like you are missing the configuration part of the exhibit.
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smckeown777Commented:
Because the 2 WAN interfaces are currently in different subnets...

A /30 subnet means you have 2 host IP's available, in this case the subnets are

192.168.10-80-83 (Branch side)
192.168.10.84-87 (HQ side)

So since they are not in the same subnet they can't talk...

Does that explain it?
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agonza07Commented:
I missed that.

smckeown777 is correct.
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MrMayAuthor Commented:
thank you smckeown777.    
so since each subnet has 2 hosts... it should be
Usable IPs  --> 192.168.10.81 - 192.168.10.82   (BRANCH)
and                    192.168.10.85 - 192.168.10.86 (HQ)

Am I right?
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smckeown777Commented:
Yep, that's correct
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