F5 Networks F5CAB5 Exam - Topic 4 Question 11 Discussion

Actual exam question for F5 Networks's F5CAB5 exam

Question #: 11
Topic #: 4

A pool member is exhibiting frequent up-and-down state changes, leading the BIG-IP Administrator to suspect a health monitor issue. Which specific log file should the BIG-IP Administrator review to diagnose the problem?

A/var/log/tmm

B/var/log/ltm

C/var/log/syslog

D/var/log/audit

Show Suggested Answer

Suggested Answer: B

The Local Traffic Manager (LTM) log file is the primary repository for all events related to load balancing objects, including virtual servers, pools, and nodes.

Monitor Logging: When a health monitor marks a pool member as 'UP' or 'DOWN,' the system generates a log entry in /var/log/ltm.

Diagnosing Flaps: To troubleshoot 'flapping' (frequent state changes), an administrator would look for messages like 01010028:3: Pool /Common/http_pool member /Common/10.10.1.1:80 monitor status down followed quickly by an 'up' status. This log provides the timestamp and the specific monitor that triggered the state change.

by Maryann at May 17, 2026, 06:08 PM

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