Which one is correct according to latest CCNA exams.

Unanswered Question

Which answer is correct according to new CCNA exam.

The Company network was assigned the Class C network from the

ISP. If the administrator at company were to subnet this class C network using the subnet mask, how may hosts will they be able to support on each subnet?

A. 14

B. 16

C. 30

D. 32

E. 62

F. 64

Answer: C


Answer: D (taking into subnet zero in account)

I have this problem too.
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ankbhasi Thu, 10/25/2007 - 01:42

Hi Soon,

As per me answer D if we ask how many host but if question is how many valid host then 30 which is answer C.



rayroyaleverest Thu, 10/25/2007 - 03:22

Cisco usually does not allow subnet address and the broadcast address, so 30 would be the allowable number of hosts.

nrichie Thu, 10/25/2007 - 07:36

You are both correct and incorrect :)

The question is asking for the number of usable "hosts". IP subnet-zero has absolutely nothing to do with the number of usable hosts, but rather the number of subnet's gained when subnetting a class full network.

Subnet 0 is the first subnet created when you subnet. Take and subnet it using the mask. People would get confused when they would see /8 and /24 (note the first is the class full network ID and the 2nd is the 1st subnet network ID) so by default, Cisco routers would not allow you to use the subnet 0. However, as engineers have evolved into the superior beings that we are today, we can easily distinguish between the 2 networks and with the global command “ip subnet-zero” we are now authorized to use the 0 subnet.

Hope this helps.



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