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You are working with a network that is $172.16.0.0$ and would like to support $600$ hosts per subnet. What subnet mask should you use?

  1. $255.255.192.0$
  2. $255.255.224.0$
  3. $255.255.252.0$
  4. None of the options
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$\textrm{option d}$
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since it is class B address we have 16 bits for net  & 16 bits for host id

to accommodate 600 host per subnet we need 10 bits (2^10= 1024 as 2^9 =512 will not hold in this scenario)

 

therefore we need to make rightmost 10 bits as 0 for mask and rest 22 will be as 1 which is nothing but

11111111.11111111.11111100.00000000

 

255.255.252.0

 

therefore option C

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