Refer to the exhibit. Which prefix does Router 1 use for traffic to Host A?
A. 10.10.10.0/28
B. 10.10.13.0/25
C. 10.10.13.144/28
D. 10.10.13.208/29
Correct Answers: D
Explanation:
The prefix with “longest prefix” will be matched first, in this case is “/29”.
Because each entry in a forwarding table may specify a sub-network, one destination address may match more than one forwarding table entry. The most specific of the matching table entries — the one with the longest subnet mask — is called the longest prefix match. It is called this because it is also the entry where the largest number of leading address bits of the destination address match those in the table entry.
Reference: https://en.wikipedia.org/wiki/Longest_prefix_match
