@Daniel-Espinal said in CCENT - Troubleshooting - IP Interface Question:
@Ronnie-Wong said in CCENT - Troubleshooting - IP Interface Question:
if you convert that 255.255.255.255 to Hex you're sending to FFFF.FFFF.FFFF, this is the Layer 2 broadcast address. So it's not limited to the Layer 3 subnet.
not to be a jerk but 255.255.255.255 is a 32 bit number while FFFF:FFFF:FFFF is a 48 bit number. You can't really convert between them because of the structure of the two addresses anyway. IP addresses have 4 sets of 8 bit numbers while MACs have 3 sets of 16 bit numbers. 255.255.255.255 actually translates into FF-FF-FF-FF.
No doubt, as usual my poor attempt at relaying a concept failed. I just meant to say they're equivalent. the 32 bit subnet mask translates into the layer 2 broadcast of ALL bits.
This is a great question, I never realized there are different types of broadcasts. Learn something new everyday.
This is why the depth of networking protocols are defined in the RFCs. We normally don't need to go this far in depth in practical networking skills but it's nice to know that there is a final authority and a finite and clearly defined limits to networking.
Furthermore the reason why it's better to use the IP of 255.255.255.255 is that it's limited to the LAN as Ronnie pointed out. By default directed Broadcast are disabled because if not then anyone not on your LAN can send a broadcast to your local LAN. This is very dangerous.
Cordially,
Ronnie Wong
Edutainer Manager, ITProTV
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