H12-821_V1.0 · Question #740
On the OSP platform, when we introduce OSPF routing to ISIS, if COST is not specified, the cost value will be set to 16 by default.
The correct answer is B. FALSE. Option B is correct because when redistributing OSPF routes into ISIS on the OSP platform without specifying a cost, the default metric value is 0, not 16. Most routing platforms use 0 (or inherit no metric) as the baseline when no explicit cost is configured during route…
Question
Options
- ATRUE
- BFALSE
How the community answered
(39 responses)- A15% (6)
- B85% (33)
Explanation
Option B is correct because when redistributing OSPF routes into ISIS on the OSP platform without specifying a cost, the default metric value is 0, not 16. Most routing platforms use 0 (or inherit no metric) as the baseline when no explicit cost is configured during route redistribution between protocols.
Option A is wrong because confusing 16 with the default redistribution cost is a common trap - 16 is actually associated with RIP's maximum hop count (infinity), and ISIS uses it in different metric contexts (such as the maximum narrow metric in some configurations), but it is not the default redistribution metric from OSPF into ISIS.
Memory tip: Think "zero means go" - when no cost is configured, redistribution starts from 0, a neutral baseline. If you see the number 16 in a routing question, ask yourself which protocol owns that number - for RIP it signals unreachability, not a default ISIS cost.
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