mediumMultiple Choice
CCNP Practice Question: Consider the following partial configuration on…
Consider the following partial configuration on Router R1:
ip sla 2
icmp-echo 10.2.2.2 frequency 15
ip sla schedule 2 life forever start-time now ip sla reaction-configuration 2 react timeout threshold-type immediate action-type triggerOnly
Which statement about this configuration is true?
⚠ Common exam trap
Cisco often tests the distinction between 'triggerOnly' (single trigger) and 'triggerAndClear' (continuous triggering) in IP SLA reaction-configuration, and candidates commonly confuse 'timeout' reaction with 'threshold' reaction, assuming a numeric RTT threshold is always required.
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 IP SLA operation will send ICMP echo requests every 15 seconds and trigger an event if a timeout occurs, but the trigger will only activate once.
The IP SLA operation sends ICMP echo requests every 15 seconds (as defined by the 'frequency 15' command) and the 'reaction-configuration' with 'threshold-type immediate' and 'action-type triggerOnly' means that as soon as a timeout occurs, a trigger event is generated, but the 'triggerOnly' keyword ensures that the trigger fires only once (not repeatedly) for the first timeout event. The operation continues to run, but no further triggers are generated for subsequent timeouts unless the reaction is rearmed.
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 IP SLA operation will send ICMP echo requests every 15 seconds and trigger an event if a timeout occurs, but the trigger will only activate once.
Why this is correct
This operation is configured with a frequency of 15 seconds, meaning an ICMP echo request is sent every 15s. The reaction-configuration uses 'react timeout' with 'threshold-type immediate', so as soon as an echo reply is not received within the timeout period, the trigger fires immediately. 'action-type triggerOnly' prevents the trigger from being re-armed, so the event is raised only once even if subsequent timeouts occur.
- ✗
The IP SLA operation will send ICMP echo requests every 15 seconds and continuously trigger events for each timeout.
Why it's wrong here
The statement incorrectly assumes the trigger fires on every timeout. Because 'action-type triggerOnly' is specified, the reaction remains in a triggered state after the first timeout and cannot generate another event without manual intervention or a reset. To obtain continuous per-timeout events, the configuration would need 'action-type triggerAndReset', which automatically re-arms the trigger after each occurrence.
- ✗
The IP SLA operation will send ICMP echo requests every 15 seconds and trigger an event if the round-trip time exceeds a threshold.
Why it's wrong here
This option misidentifies what is being monitored. 'react timeout' is a reaction to an ICMP echo request that receives no reply before the operation's timeout timer expires; it is not based on comparing the round-trip time (RTT) to a numerical threshold. RTT threshold monitoring would use a separate 'react rtt' configuration with the appropriate threshold type and value, such as 'threshold-type x>value'.
- ✗
The IP SLA operation will send ICMP echo requests every 15 seconds, but the 'reaction-configuration' command is invalid because it requires a threshold value.
Why it's wrong here
The command is not invalid for lacking a numeric threshold value. 'threshold-type immediate' is a valid keyword that means the reaction triggers immediately when the specified condition (here, a timeout) occurs, without needing a threshold number. Numeric thresholds are only required for other threshold types like 'consecutive' or 'average', where a count or a value must be defined.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.