Given a subnet address of 10.1.129.0/25, what is the broadcast address?

Given a subnet address of 10.1.129.0/25, what is the broadcast address?

• 10.1.129.25
• 10.1.129.127
• 10.255.255.255
• 10.1.129.255 

EXPLANATION

If we look at the address and subnet mask in binary, we can see the following:
0000 1010 . 0000 0001 . 1000 0001 . 0000 0000
1111  1111 . 1111 1111  . 1111 1111  . 1000 0000
Looking at the last octet, we can see that there are 7 binary zeros. These indicate that we have 7 host bits. When you change all of those bits to ones, you end up with:



 0000 1010 . 0000 0001 . 1000 0001 . 0111 1111
Converting back to decimal, we get:
10.1.129.127.

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