As network administrator, what is the subnet mask that allows 510 hosts given th
ID: 3618940 • Letter: A
Question
As network administrator, what is the subnet mask that allows 510 hosts given the IP address 172.30.0.0?Explanation / Answer
=> 255.255.254.0 172.30.0.0 isan IP Address of type Class B. So, the possible sub net mask willbe 255.255.0.0 as per the problem only 510 hosts are allowed and 0 , 255 arereserved for special purposes. so total of 512 hostspossible. 512 = 29 = 1 bit in third octets and 8 bits in fourth octets are used in IPAllocation. if you see the class B sub net mask, Octet 1 andOctet 2 will be completely used for Sub net Masking. But in, third Octet only 1 bit used for IP addressing, it means theremaining 7 bits can be used for Sub net masking. so, the third octet will be 11111110 = which is equal to 254. Only last bit will be usedin Node addressing part. So , the final sub net mask will be, 255.255.254.0. For more details on Sub net mask calculations, referthis http://www.joshgentry.com/networking/subnet.htm
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