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Cisco Certified Network Associate (CCNA) · Cisco
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B. Longest match: they're the same, but the admin distance of 108 is lower than the other two.
B is correct. I would have a real problem with this question if all administrative distances were above the default for OSPF because you then would need a show ip route to know for sure.
The default route 0.0.0.0 via 10.10.10.2 is not chosen by R1 to reach Host B because specific routes take precedence over the default route. In routing decisions, routers always prefer the most specific match for a destination in the routing table. SO Routers always choose a route with the longest prefix length (the most specific match) over a less specific one.