difference between 255.255.255.255 and 172.172.255.255

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Apr 18th, 2010
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Hi  every body.



I  was reading about the broadcast addresses.  Let say we have classB address  172.172.0.0, then 172.172.255.255  will be the broadcast address for the network 172.172.0.0.  How about  255.255.255.255.? how  does it differ from 172.172.255.255?



thanks and have a  nice weekend.

Correct Answer by Jon Marshall about 7 years 2 months ago

sarahr202 wrote:


Hi  every body.



I  was reading about the broadcast addresses.  Let say we have classB address  172.172.0.0, then 172.172.255.255  will be the broadcast address for the network 172.172.0.0.  How about  255.255.255.255.? how  does it differ from 172.172.255.255?



thanks and have a  nice weekend.


Sarah


172.172.255.255 is as you say a braodcast to all devices on the 172.172.0.0/16 network


255.255.255.255 is a broadcast to all devices irrespective of the network so if the router forwarded broadcasts it will literally forward this packet to every device.


Jon

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Correct Answer
Jon Marshall Sun, 04/18/2010 - 07:18
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sarahr202 wrote:


Hi  every body.



I  was reading about the broadcast addresses.  Let say we have classB address  172.172.0.0, then 172.172.255.255  will be the broadcast address for the network 172.172.0.0.  How about  255.255.255.255.? how  does it differ from 172.172.255.255?



thanks and have a  nice weekend.


Sarah


172.172.255.255 is as you say a braodcast to all devices on the 172.172.0.0/16 network


255.255.255.255 is a broadcast to all devices irrespective of the network so if the router forwarded broadcasts it will literally forward this packet to every device.


Jon

sarahr202 Sun, 04/18/2010 - 09:02
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thanks  Jon. How are you  doing?

Jon Marshall Sun, 04/18/2010 - 09:17
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sarahr202 wrote:


thanks  Jon. How are you  doing?


Good thanks Sarah. How is your army career progressing ?


Jon

sarahr202 Fri, 05/21/2010 - 09:51
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Sorry  for not replying in time.


Well, so far  i am enjoying it,   I could hardly run 3 miles  before i joined the army. Now  i  can  run 3 miles(  .  The only sad part is  i could not get my Networking  job in the army.  Right now  my  job is maintaing and troubleshooting  electronics  for the army. I am just hoping  to get a chance to work on routers and switches, networks.  Since right now i can't, i can only study and learn about  networks right now  which will come handy once i  start working in networking.



You have a good weekend Jon.

255.255.255.255 is the broadcast address for a device that doesn't know (or perhaps just doesn't care) what network it's on.  The local TCP/IP stack will convert it to a layer 2 (usually Ethernet) broadcast, so it will go to everyone on the local segment.


172.172.255.255. is broadcast address on 172.172.0.0/16 network like 172.172.1.255 means braoadcast address of network 172.172.1.0/24.


Hope this helps you!!


Regards,

Venkat Koyi

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