A is false – The correct formula is: Skew_Time = (256 - Priority)/256 × Advertisement_Interval.
B is false – By default, the preemption delay is typically 0s, not 1s, meaning a higher-priority backup router can preempt immediately unless configured otherwise.
C is true – The default Advertisement interval in VRRP is 2 seconds.
D is true – The formula Master_Down_Interval = 3 × Advertisement_Interval + Skew_Time is correct.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
“The VRRP Skew_Time is calculated as (256 - Priority)/256 × Adver_Interval. The Master_Down interval includes this Skew_Time to stagger failover.”
(Chapter: High Availability – Section: VRRP Timer Mechanism)
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