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5396 Views 2 Replies Latest reply: Jun 7, 2011 2:11 PM by Martin RSS

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Which two address can be assigned to a host with a subnet mask of 255.255.254.0?

Jun 7, 2011 11:33 AM

Manesh 4 posts since
May 10, 2010

Which two address can be assigned to a host with a subnet mask of 255.255.254.0?

 

 

 

Ans:

 

 

 

186.54.3.0

 

26.35.2.255

 

 

 

Can anybody explain this question ???

  • Brian 2,971 posts since
    Aug 17, 2009

    With these types of questions you need to ask yourself the following questions. 

     

    What is the network address?

    What is the broadcast address?

    What is the FVH?

    What is the LVH?

     

    Then you can see if the address in question fits within the range of valid hosts.  Ok...lets take each one independently.

     

    1) 186.54.3.0 mask 255.255.254.0

     

    A mask of 255.255.254.0 = /23 means two /24s.  So the networks are counting by "2" in the third octet:

     

    186.54.0.0/23

    186.54.2.0/23  ---> belongs here

    186.54.4.0/23

     

    Now we can answer the questions above.

     

    What is the network address? 186.54.2.0

    What is the broadcast address? 186.54.3.255

    What is the FVH? 186.54.2.1

    What is the LVH? 186.54.3.254

     

    So, 186.54.3.0 is a valid host address within the network 186.54.2.0/23

     

    2) 26.35.2.255 mask 255.255.254.0

     

    Again, we are counting by "2" in the third octet.

     

    So the networks for this address are:

     

    23.35.0.0/23

    23.35.2.0/23   ---> belongs here

    23.35.4.0/23

     

    Again answer the same questions.

     

    What is the network address?  23.35.2.0

    What is the broadcast address?  23.35.3.255

    What is the FVH? 23.35.2.1

    What is the LVH? 23.35.3.254

     

    So, 23.35.2.255 is a valid host address within the network 23.35.2.0/23

     

    HTH

  • Martin 13,075 posts since
    Jan 16, 2009

    Search forum for some tips and for Magic Number (or Multiplier);

     

    Magic number is 256 - 254 =2 that happens to be in 3rd octet, so  in that octet,

    you can start counting from 0, add 2, +2=4, 6, 8, 10, ....

     

    then follow Brian's explanation on why is valid IP

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