im quite confused on this question even though i can subnet. Which interface will a packet with a destination address of 10.10.10.14 be forwarded from?

10.10.10.16/28

10.10.10.4/30

10.10.10.8/29

So when i did the math out. /28 = 255.255.255.240. 256-240 = 16. block size 0,16,32,64. The broadcast for 0 subnet would be 15 which is minus 1 from the next subnet, and last valid host would be 14.

/30 = 255.255.255.252. 265-252 = 4. block size 0,4,8,12,16,20. The broadcast for 12 subnet is 15. Last valid host is 14.

/29 = 255.255.255.248. 256-248 = 8. block size 0,8,16. The broadcast for 8 subnet is 15. Last valid host is 14.

The book says the answer is 10.10.10.8/29. They all have the valid host as 14 so wouldnt they all be able to work?

My best guess is that 10.10.10.14 falls in between the range for 10.10.10.8/29 which is 10.10.10.9-10.10.10.14.

## Bookmarks