Given the information below please show your work on HOW to get to the Broadcast

Question

Given the information below please show your work on HOW to get to the Broadcast address. I believe the Broadcast addresses below are correct but I do not understand how to get that answer...

1)      Network ID: 172.16.2.160    Subnet Mask: 255.255.255.192                       

   172 = 1010 1100

   Class B                                 Subnet Mask: 255.255.1111 1111.1100 0000

   Broadcast Address: 172.16.6.127

2)      Network ID: 212.172.38.72   Subnet Mask: 255.255.255.192

   212 = 1101 0100

   Class C                                   Subnet Mask: 255.255.255.1100 0000

   Broadcast Address: 212.172.38.127

3)      Network ID: 180.15.76.0     Subnet Mask: 255.255.192.0

   180 = 1011 0100

   Class B                                 Subnet Mask: 255.255.1100 0000.0000 0000

   Broadcast Address: 180.15.127.255

Explanation / Answer

To understand this then you should know concept of the class full addressing. then it is easy to answer the question let me take a simple example and make every thing clear for you.

if you see the ipv4 is a32-bit address it can be divided into four 8-bits so in that the first octet will tells about the particular ip address will belongs to here i am giving range and class

Class -A (1 -126) First 8bits divided into network part and next 24 bits divided into host part

Class-B(128-191) First 16 bits divided into network part and next 16 bits divided into host part

Class-C(192-223) First 24 bits divided into network part and next 8 bits divided into host part.

So now see how to write the SUBNET MASK.

SBUNET MASK:- it is a sequence of ones followed by zeros while writing the subnet mask you just see in the network part depends on which class it is you kept those many ones and after remaining part you just kept all zeros.

Example:-129.16.4.0 if you observe it is clearly belongs to class -b so in class-b the first 16 bits are for network id so subnet maks is like this 255.255.0.0

And lets see about Broadcast Address is like this it is depends on whether it is limited broadcasting or directed broadcasting.if it is LBA then you send the packet from you host to all other hosts present in your network and directed broad cast means sending the packet from you computer to all other hosts present the other network.

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