352-001 Question #605: Real Exam Question with Answer & Explanation

Question

Options

• ALink failure tears down neighbor relationships regardless of network type configured
• BType 1 LSAs are not generated on a point-to-point network type
• CAdjacencies can be built faster without a DR/BDR on the segment
• DThe fabric memory requirements are significantly smaller than with a DR/BDR on each leaf and
• EThe point-to-point network type allows for NSF to be used in this design

Explanation

OSPF point-to-point network type removes the DR/BDR election requirement on Ethernet links, allowing adjacencies to form immediately and improving convergence speed in leaf-spine fabrics.

Common mistakes.

• A. Although a link failure tears down neighbor relationships on any OSPF network type, this fact describes a universal behavior and does not provide a specific justification for choosing point-to-point over broadcast.
• B. Type 1 Router LSAs are still generated on point-to-point links; it is Type 2 Network LSAs that are eliminated because there is no DR to originate them.
• D. While eliminating the DR does reduce Network LSA flooding, memory savings are minimal in a modern data center and are not the primary design justification for using point-to-point in a fast-convergence context.
• E. Non-Stop Forwarding relies on graceful restart mechanisms independent of OSPF network type, and the point-to-point type does not specifically enable or require NSF.

Concept tested. OSPF point-to-point network type for fast convergence

Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html

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