A network administrator has been asked to configure the most specific aggregate route to summarize the four specific prefixes shown below:
10. .5.0/24
10. .12.0/24
10. .17.0/24
10. .21.0/24
Which configuration completes this task?
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A. B. C. D.A
To configure the most specific aggregate route that summarizes the four specific prefixes given, we need to determine the prefix length that covers all four prefixes.
First, we need to find the common bits in the four prefixes. The first two octets (10. and the second octet) are the same for all four prefixes. The third octet has some bits that are the same (bits 0 to 3), and some bits that are different (bits 4 to 7). The fourth octet has all different bits.
Therefore, the most specific aggregate route that summarizes all four prefixes would be 10.0.0.0/19, because it covers all four prefixes and is the shortest possible prefix that does so.
Option A is the correct answer:
scss[edit routing-options] user@router# show aggregate { route 10.0.0.0/19; } Option B is incorrect because it is too short and does not cover all four prefixes. Option C is also too short and only covers two of the four prefixes. Option D is too long and covers more than just the four prefixes given.