Exam 301b topic 1 question 125 discussion

Actual exam question from F5's 301b

Question #: 125
Topic #: 1

While investigating the cause of a device failover, an LTM Specialist discovers the following events in /var/log/ltm:
01010029:5: Clock advanced by 518 ticks
01010029:5: Clock advanced by 505 ticks
01010029:5: Clock advanced by 590 ticks
01010029:5: Clock advanced by 568 ticks
01010029:5: Clock advanced by 1681 ticks
01010029:5: Clock advanced by 6584 ticks
01140029:5: HA daemon_heartbeat tmm fails action is failover and restart.
010c0026:5: Failover condition, active attempting to go standby.
Which issue caused the failover?

A. NTP being out of sync
B. TMM being descheduled
C. VLAN Fail-safe heartbeats
D. HA missing heartbeat packets

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Suggested Answer: B 🗳️

by Wassu at Oct. 12, 2020, 12:04 a.m.

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GVKD

8 months, 4 weeks ago

B - Correct TMM failed to update its heartbeat signal for over 10 seconds. This event caused the HA daemon to terminate, produce a core file, and cause a failover. https://my.f5.com/manage/s/article/K10095

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Degenhardt

3 years, 12 months ago

https://support.f5.com/csp/article/K10095#anchor2

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Wassu

4 years ago

Why not A , click bits is ntp related

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GVKD

8 months, 4 weeks ago

I think it is B because the NTP being out of sync did not directly cause the Failover, that was caused by the TMM daemon timer falling behind the system time and registering missing the heartbeats due to the forward jump in time when the daemon aligns itself with the system clock again.

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Exam 301b topic 1 question 125 discussion

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