Q & A on Broadcast and Loopback Addresses

Q: In figure 16.7, you said 

Prefix      Suffix     Type of Address    Purpose
------      ------     -----------------  ---------------------- 
all-1s      all-1s     Limited broadcast  Broadcast on local net
127         any        loopback           Testing 
------      ------     -----------------  ---------------------- 



Now consider the 127.255.255.255 address, which is a class A address 
with a prefix = 127, i.e., all-1s and its suffix is all-1s.



do you consider it a "Limited broadcast" or a "loopback" address?



127 is *not* all-1s; 255 is.  Thus, any 127 address is loopback and the
limited broadcast address is 255.255.255.255.