Looking at the routes in the table:
172.16.32.0/26 via 10.0.0.1
172.16.32.0/24 via 10.0.0.2
172.16.32.0/19 via 10.0.0.3
Of these three, the /26 network (255.255.255.192) is the most specific subnet that would include the IP address 172.16.32.8. This is because a /26 network has a subnet mask with 64 IP addresses, and the range for the first /26 subnet in the 172.16.32.0 network would be from 172.16.32.0 to 172.16.32.63.
Therefore, the subnet mask of the preferred destination route for the packet to reach 172.16.32.8 is:
C. 255.255.255.192
Option D is going to have only 4 Ip addresses.
1. 172.16.32.4- Network ID
2.172.16.32.5- First usable Address
3.172.16.32.6- Last usable Address
4.172.16.32.7- Broadcast Address.
Therefore, 172.16.32.8 is not coming in this subnet.
Option D) "/30" yes, it is the longest prefix, but it does not include "172.16.32.8" as a usable address, it would be the broadcast. That's why we take the next longest prefix, in this case "/26".
/32 = 1 add
/31 = 2 add
/30 = 4 add
/29 = 8 add
....
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