What would be broadcast address of a host 192.168.1.255/20?

The question is valid. The question asked that 192.168.1.255 is a host of /20 network. Here we need to think CIDR and VLSM.

192.168.0.0/24 =   192.168.0.0 - 192.168.0.255     = 256

192.168.0.0/23=    192.168.0.0 - 192.168.1.255     = 512

192.168.0.0/22=    192.168.0.0 - 192.168.3.255     =1024

192.168.0.0/21=    192.168.0.0 - 192.168.7.255     =2048 

192.168.0.0/20=    192.168.0.0 - 192.168.15.255     =4096

Now we find the range of 192.168.0.0/20 which starts from 192.168.0.0 and ends at 192.168.15.255

Network Address: 192.168.0.0

Broadcast Address: 192.168.15.255

Between 192.168.0.0 to 192.168.15.255 all are usable host. It means 4094 usable host. 192.168.1.255 is also a host in this range.

/ =...0. Multiply this bit by bit to..1.

=..0.0 -> first network address

We only care on the third octet which is being subnetted by4bits,

Adding1 to the4th bit from the left will result to the next network,

    =

Which means by adding we will get the other networks(0,,,...,)

1st network =..0.0

2nd network =...0

.

.

th network =...0

Clearly the host(..1.) falls in the first network.

The broadcast address can be calculated by dimishing1 from the last octet of the next network address

Which is equal to .../

192.168.1.255/20

255.255.240.0     11111111.11111111.11110000.00000000 /20

Host = (2 powers 4) -2 = 14    note Number 4 is number of ones  11110000

Sunbet = 2 power 4    = 16            note Number 4 is number of zeros  11110000

First network 192.168.1.1                              second network 192.168.1.16 

First Host 192.168.1.2                                   First Host 192.168.1.17

Last host 192.168.1.14                                  Last host 192.168.1.30

Broadcast domain 192.168.1.15                  Broadcast domain 192.168.1.31

Now increase  number of  first network  like this :

16-32-48-64 ....... to 240 - 256 -------> this is last rang 

the Broadcast domain 192.168.1.255

Wrong Question :)

easy to know

http://www.subnet-calculator.com/

The broadcast address is 

Broadcast address will be...

the answer is...  the network address is..0.0/

Broadcast address of 192.168.1.255 /20 is 192.168.15.255

It will be...0. Hope you have right answer.