Broadcast Address

Question

IP address of a host is 129.48.32.68 and subnet mask is 255.255.240.0. What will be the broadcast address of the subnet.

A)129.48.32.255

B)129.48.47.255

Answer 1

answer will be A)

Comments

IP = 129.48.32.68

Subnet mask = 255.255.240.0

Subnet ID = 129.48.32.0

From the subnet mask 16 bits is for Network, 4 bits is for subnet id and 12 bits is for host. And to find DBA make all host bits as 1. So 3rd and 4th octet looks like

0010 1111 1111 1111

.47.255

So DBA = 129.48.47.255

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yes, 129.48.47.255 is correct DBA

@Shubham

you are correct that n/w id is 129.48.32.0, but it is like 129.48.32.0/20

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thanks for that