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352-001 · Question #142
352-001 Question #142: Real Exam Question with Answer & Explanation
The correct answer is A: BFD. In carrier Ethernet designs, BFD, object tracking, and fast IGP hellos each reduce the time to detect a Layer 2 failure and trigger routing reconvergence.
Question
In a network design using carrier Ethernet, which three mechanisms can be used to improve Layer 2 down detection and thereby reduce routing convergence time? (Choose three.)
Options
- ABFD
- BEthernet port debounce timers
- Clink-state tracking
- Dobject tracking
- Efast IGP hello
Explanation
In carrier Ethernet designs, BFD, object tracking, and fast IGP hellos each reduce the time to detect a Layer 2 failure and trigger routing reconvergence.
Common mistakes.
- B. Ethernet port debounce timers intentionally delay the reporting of a port-state change to suppress flapping, which increases the time to detect a failure and worsens convergence time.
- C. Link-state tracking propagates uplink failures to downstream interfaces on access switches for redundancy purposes and is not a convergence-acceleration mechanism for routing protocols.
Concept tested. Layer 2 failure detection mechanisms for routing convergence
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