With which of the following could EIGRP and OSPF achieve sub second convergence ? (Choose Two)

Question

Options

• ABFD
• BTriangle topology
• CSquare topology
• DRing topology
• ETuning timers
• FIP SLA

• A
  85% (29)
• C
  3% (1)
• E
  9% (3)
• F
  3% (1)

Explanation

A (BFD): Bidirectional Forwarding Detection is a lightweight, protocol-independent hello mechanism that detects link or path failures in milliseconds (configurable to sub-second intervals). EIGRP and OSPF integrate with BFD so that when BFD detects a failure, it immediately notifies the routing protocol, triggering instant reconvergence without waiting for routing hello timers to expire. B (Triangle topology): A triangle (full-mesh between three routers) provides every router with an immediately available alternate path. With EIGRP, a pre-computed feasible successor is already in the topology table; with OSPF, the alternate path is already in the SPF tree. When a link fails, the routing process can switch to the backup path in sub-second time without needing to run a new SPF or DUAL computation from scratch. Tuning timers (E) can help but is not a reliable method to guarantee sub-second convergence on its own.

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