Assume a router has three entries in its forwarding table: two for the following

Question

Assume a router has three entries in its forwarding table: two for the following two prefixes (see below), plus a default entry for all other addresses. If both prefixes are mapped to the same route, and the default entry is mapped to a different route, is there a safe way to combine the two prefixes, without changing routes for any destinations? If yes, what would the alternative entry or entries look like? If no, which unintended destination would be covered by a combined prefix?

(a) 79.126.2.0/23 and 79.126.4.0/23

(b) 79.126.4.0/23 and 79.126.6.0/23

(c) 79.126.4.0/23 and 79.126.6.0/24

Explanation / Answer

A) 79.126.2.0/23 and 79.126.4.0/23

the above is the unintended destination

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