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TOPIC: Subnetting Question [number of networks]

Subnetting Question [number of networks] 8 years 5 months ago #25850

  • kogula14
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Hi,

I have question in subnetting.
Question: How many subnetworks and hosts are available per subnet if you apply a /28 mask to the 210.10.2.0 class C network?

Well is it the answer is [16 networks and 14 hosts]??

I need to clear my doubt because the answer for this question according to actualtest.com is [14 networks and 14 hosts]!!

Which one is correct? 14 or 16 network??

Please help me.
Thanks[/img]
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Re: Subnetting Question [number of networks] 8 years 5 months ago #25851

  • Smurf
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Old school, the same rule applies for networks as it does hosts, i.e 2^x-2 (x is bits)

Most hardware now allow the lower & upper (all 0's & all 1's) bits so it does work. The key is MOST. I have never come across them not being able to be used. Cisco devices have a command to turn this on (IP Subnet-Zero), this basically allows the additional range to be used.

Cheers
Wayne Murphy
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Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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Re: Subnetting Question [number of networks] 8 years 5 months ago #25854

  • S0lo
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And thats just an example of the difference between cisco exams and the real world. In such cases, you have a "correct answer" and a "cisco answer". Use the cisco one only in your exams :o
Studying CCNP...

Ammar Muqaddas
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Re: Subnetting Question [number of networks] 8 years 5 months ago #25857

  • Chojin
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cisco also counts Gateway as host.. so therefor I think Cisco's type of answer isn't any different from the real world.. or am I forgetting something ?!
CCNA / CCNP / CCNA - Security / CCIP / Prince2 / Checkpoint CCSA
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Re: Subnetting Question [number of networks] 8 years 5 months ago #25871

  • kogula14
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alrite. thanks for all of u guys. Now im clear and will use old school formula 2^x-2, x=bit


Thanks guys!
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Re: Subnetting Question [number of networks] 8 years 5 months ago #25872

  • Smurf
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cisco also counts Gateway as host.. so therefor I think Cisco's type of answer isn't any different from the real world.. or am I forgetting something ?!

Gateway address is a valid host address ? It doesn't distinguish between what a host is, its just valid addresses within a subnet range.
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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