300-320 Question #122: Real Exam Question with Answer & Explanation

The correct answer is D: Summarize routes at the distribution to the core to limit EIGRP queries or OSPF LSA. Route summarization at the distribution layer is a fundamental best practice in hierarchical network design. In EIGRP, summarization prevents query messages from propagating into the core, keeping the Stuck-In-Active (SIA) problem contained within its own domain. In OSPF, summari

Question

Which of these practices should you follow when designing a Layer 3 routing protocol?

Options

ANever peer on transit links.
BBuild squares for deterministic convergence.
CBuild inverted U designs for deterministic convergence.
DSummarize routes at the distribution to the core to limit EIGRP queries or OSPF LSA

Explanation

Route summarization at the distribution layer is a fundamental best practice in hierarchical network design. In EIGRP, summarization prevents query messages from propagating into the core, keeping the Stuck-In-Active (SIA) problem contained within its own domain. In OSPF, summarization between areas limits LSA flooding, reducing SPF recalculation overhead in the core. The other options are incorrect: you should peer on transit links (not avoid them), hierarchical designs use triangles (not squares or inverted-U shapes) to provide deterministic, loop-free convergence.

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