ip addressing help please.. Thanks

Unanswered Question
Dec 12th, 2008

what is the brodcast address of this interface if the show int fa0/0 shows

internet address / 28

can anyone explain pls


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Giuseppe Larosa Fri, 12/12/2008 - 11:30

Hello Octorbust

/28 means 4 bits host part a maximum of 14 hosts in the subnet

the broadcast is 1 less the next /28 subnet

the base address is made of all zeros

the addresses in the middle are for the hosts

base address

brodcast for

usable addresses: -

base address

broadcast for

usable addresses:

Hope to help


cisco steps Fri, 12/12/2008 - 12:14


Thanks for the info

now i know that /28 is

x.x.x .

and the number of host is 2^4 - 2 = 14

now how do you come up w/

the only option to chouse from are

Richard Burts Fri, 12/12/2008 - 12:18

Giuseppe was confused by your question asking about an address with 5 octets. He condidered the address as Obviously the question really meant to ask about



Richard Burts Fri, 12/12/2008 - 12:12

I believe that the question has a mistake in it since the question asks about an address that has 5 octets: / 28

Giuseppe gives an answer that is correct if you consider just the first 4 octets. Looking at the context of the question I wonder if the 200 was inserted by error and the question meant to ask about address / 28

in which case the broadcast address would be



khomitchr Fri, 01/02/2009 - 22:22

Here is a subnet chart you can use that I created for myself. Feel free to use it. I recommend printing it out and you might need to zoom in a little to see the numbers better.



gagamboy15 Sat, 01/03/2009 - 21:07 /28

base address =

host = to .30

Broadcast =

Hope it helps.



This Discussion