I’ve been following the CCENT official certification book(100-105) and came upon this question in the “do I know this already?” quiz. The books only covered /24 subnetting only so far.
Which of the following is a network broadcast address?
As no subnetting notation has been included, I’ll stick with .255 ending as being broadcast.
- a = seems correct.
- b = incorrect. ends with .1
- c = incorrect, it’s a class d multicast.
- d = seems corrects too.
The answer says ONLY D is correct.
So why is A incorrect? My understanding:
- 10.1.255.0 as the network ID
- 10.1.255.1 to 10.1.255.254 as valid IP addresses.
- 10.1.255.255 as the broadcast
Class a = 8 Bits network ID. 24 Bits Host ID. (0 subnet bits as theirs only 1 whole subnet? is this correct?)
subnet mask = 255.0.0.0
I believe it's my lack of understanding of how subnet masks correlate to Ip addresses