hardMultiple Choice
300-410 Router R8 is configured with SNMP and IP SLA Practice Question
Router R8 is configured with SNMP and IP SLA. The IP SLA operation sends SNMP traps to the NMS when a threshold is crossed. The configuration includes: ip sla 1, icmp-echo 192.168.1.1, threshold 100, timeout 1000, frequency 10, ip sla schedule 1 life forever start-time now, snmp-server enable traps ip sla. However, the NMS receives no traps when the threshold is crossed. The IP SLA operation shows 'Over threshold' in show ip sla statistics. What is the root cause?
⚠ Common exam trap
Cisco often tests the distinction between enabling SNMP traps globally ('snmp-server enable traps ip sla') and configuring the specific reaction that triggers those traps ('ip sla reaction-configuration'), leading candidates to overlook the missing reaction command.
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 is missing the 'ip sla reaction-configuration' command to trigger SNMP traps when the threshold is exceeded.
The 'ip sla reaction-configuration' command is required to define the condition (e.g., threshold violation) that triggers an SNMP trap. Without this command, the IP SLA operation can detect and report 'Over threshold' in statistics, but it has no mechanism to generate an SNMP trap to the NMS. The 'snmp-server enable traps ip sla' command only enables the router to send IP SLA traps globally; it does not link a specific reaction to the threshold event.
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 is missing the 'ip sla reaction-configuration' command to trigger SNMP traps when the threshold is exceeded.
Why this is correct
Thresholds alone only mark the operation as over threshold in statistics; SNMP traps require ip sla reaction-configuration with a reaction type such as timeout or threshold and the action of sending traps. Without it, no trap is generated despite the over-threshold state.
- ✗
The NMS is not configured to receive IP SLA traps.
Why it's wrong here
The NMS not being configured to receive IP SLA traps is outside the router's control and not evidenced by the stem; the router must still send them. NMS-side configuration would be the cause if traps were confirmed sent but not logged, which the stem does not state.
- ✗
The SNMP community string is incorrect for trap sending.
Why it's wrong here
The community string affects SNMP polling and trap authentication, but the stem gives no indication it is wrong, and the operation already reports 'Over threshold'. An incorrect community would be the cause if traps arrived but were rejected, or if polling failed.
- ✗
The IP SLA operation is not scheduled correctly.
Why it's wrong here
The operation is scheduled with 'start-time now' and 'life forever', so it is running and reporting 'Over threshold'. The missing piece is the SNMP trap destination or community, not scheduling. Scheduling would be the cause if the operation showed 'inactive' or had no start time.
Go deeper
Related to this question
Learn chapter
Device Management and Network Monitoring (SNMP, Syslog, NetFlow)
Key term
IP SLA for Path Control
IP SLA for Path Control is a Cisco technology that uses active network measurements to dynamically influence routing decisions and redirect traffic along a preferred path when network conditions change.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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