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300-410 Configures EEM to monitor CPU usage on R1 Practice Question
A network engineer configures EEM to monitor CPU usage on R1. R1 has: event manager applet CPU-MONITOR event snmp oid 1.3.6.1.4.1.9.9.109.1.1.1.1.7.1 get-type exact entry-op gt entry-val 80 poll-interval 5 action 1.0 cli command "enable" action 2.0 cli command "show processes cpu sorted" action 3.0 syslog msg "High CPU usage detected". After a few hours, the engineer notices that the applet triggers repeatedly, but the show command output is truncated. Router R2 shows: no issues. What is the root cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The EEM applet runs too frequently (every 5 seconds), consuming CPU and causing output truncation.
The EEM applet triggers every 5 seconds when CPU exceeds 80%, and each execution runs the show command, which itself consumes CPU. This can create a feedback loop where the applet increases CPU usage, causing more triggers. Additionally, the show command output may be truncated if the applet runs too frequently or the buffer is insufficient. The correct fix is to increase the poll interval or add a throttle.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The EEM applet runs too frequently (every 5 seconds), consuming CPU and causing output truncation.
Why this is correct
Frequent execution of the show command increases CPU load, worsening the condition.
- ✗
The SNMP OID is for 5-second CPU, not 1-minute average, causing false positives.
Why it's wrong here
The OID is for 5-second CPU, but the issue is the frequency, not the OID.
- ✗
The 'show processes cpu sorted' command requires a terminal length setting.
Why it's wrong here
Output truncation is due to buffer limits, not terminal length.
- ✗
The applet should use 'event manager applet CPU-MONITOR trigger' to start.
Why it's wrong here
The applet is already triggered by the SNMP event.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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