Cisco
352-001 · Question #259
352-001 Question #259: Real Exam Question with Answer & Explanation
The correct answer is D: Leak specific summaries on the ABRs for the remote subnets in addition to the default.. When OSPF stub area users follow a suboptimal default route to remote destinations, leaking specific route summaries from the ABR provides more precise forwarding information so routers can choose the best path.
Question
In an OSPF network, users in a particular OSPF non-backbone area are complaining about slow access speeds to a shared corporate resource in another OSPF area. Traceroutes show that theusers are taking a suboptimal default route to the destinations. Which solution will improve access speed?
Options
- AMake the area totally stubby so that the default can be followed along the best path.
- BCreate a virtual link between the areas so that traffic can shortcut directly between them.
- CImplement policy routing to channel the traffic in the optimal direction.
- DLeak specific summaries on the ABRs for the remote subnets in addition to the default.
Explanation
When OSPF stub area users follow a suboptimal default route to remote destinations, leaking specific route summaries from the ABR provides more precise forwarding information so routers can choose the best path.
Common mistakes.
- A. Converting the area to totally stubby still injects only a single default route, which is exactly the suboptimal path the users are already following.
- B. Virtual links reconnect a partitioned non-backbone area to Area 0 and do not create shortcut forwarding paths between two arbitrary non-backbone areas.
- C. Policy routing can redirect traffic but adds operational complexity and does not address the root cause, which is the absence of specific routing information in the area.
Concept tested. OSPF route leaking on ABR for path optimization
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