What is the default BFD poll-interval value (milliseconds) in the basic configuration?
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Correct answer: 600,000.
Why this is the answer
The correct answer is 600,000 milliseconds (10 minutes). In Cisco SD-WAN, the default Bidirectional Forwarding Detection (BFD) poll-interval for basic configuration is 600,000 ms. This value dictates how frequently BFD packets are sent to monitor the liveness of a data path. A higher value, like 600,000 ms, means less frequent polling, which conserves bandwidth and CPU resources but increases the detection time for path failures. The other options (300,000, 900,000, 1,200,000) are not the default values for the basic BFD poll-interval in Cisco SD-WAN. While these values could be configured, they are not the out-of-the-box default.
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