Routing table question

k31453

Ok I dont get from following question why is only option C?
its 10.1.5.65 which fits option B as well so why only C ?

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Comments

verbhertz

That route has the most specific prefix (/29).

gorebrush

As above, longest prefix match always wins.

k31453

I still dont get it.

james43026

k31453 wrote: »

Ok I dont get from following question why is only option C?
its 10.1.5.65 which fits option B as well so why only C ?

Yes, there a multiple entries that match in this question. But the entry with the longest prefix match will always win, a /29 prefix is a longer match than a /28 prefix. Meaning the subnet mask / network address for the /29 has more bits dedicated to the network portion of it's associated network ID of 10.1.5.64, which means it is much more accurate than the other choices. You must remember than in networking there will be many times that there are many answers that will work, but only 1 will be considered correct according to standards. This is a tricky question, but it's something that could make a difference while troubleshooting an issue.