valid host address

Answered Question
Apr 22nd, 2010
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the answers for the question below is 1,3,4

Can someone help to explain why 2 and 6 not valid host address?


What are three valid host addresses given a subnet mask of 255.255.254.0? (Choose three.)
1.64.100.2.255
2.172.55.33.255
3.64.104.129.0
4.192.168.162.255
5.10.165.55.255
6.128.107.62.0

Correct Answer by Giuseppe Larosa about 7 years 1 month ago

Hello Peiwai,

a valid host address means no broadcast address and no subnet address can be used and means that not all 9 bits of host portion can be all 1 or all 0.


2) 2.172.55.33.255

you need to write in binary the last two octets


  33.255 = 001000||1 1111 1111


as you can see all last 9 bits are set to 1 so this is a broadcast address of subnet 172.55.32.0/23


6) 128.107.62.0


    62.0 in binary  =  0011 111||0  0000 0000


here all last 9 bits are set to zero this is a subnet address 128.107.62.0/23


question five is like 2)


Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Thu, 04/22/2010 - 07:07
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Hello Peiwai,

a valid host address means no broadcast address and no subnet address can be used and means that not all 9 bits of host portion can be all 1 or all 0.


2) 2.172.55.33.255

you need to write in binary the last two octets


  33.255 = 001000||1 1111 1111


as you can see all last 9 bits are set to 1 so this is a broadcast address of subnet 172.55.32.0/23


6) 128.107.62.0


    62.0 in binary  =  0011 111||0  0000 0000


here all last 9 bits are set to zero this is a subnet address 128.107.62.0/23


question five is like 2)


Hope to help

Giuseppe

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