hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Configures an EEM applet to monitor EIGRP…
A network engineer configures an EEM applet to monitor EIGRP stuck-in-active (SIA) events using the event syslog pattern 'EIGRP-3-SIA'. The applet is designed to clear the EIGRP neighbor. The EIGRP network has a unidirectional link that causes a route to go active, but the EEM applet does not trigger. Which is the most likely explanation?
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 EIGRP SIA syslog message is only generated when the SIA timer expires, but a unidirectional link may prevent the query from being sent, so the timer never starts.
EIGRP SIA events generate syslog messages only when the SIA timer expires (default 3 minutes). If the unidirectional link causes the route to go active but the query propagation is blocked or the neighbor is not reachable, the SIA timer may not start because the router does not receive a reply from the neighbor. In some cases, the route may remain active indefinitely without generating an SIA syslog if the query is not sent due to the unidirectional link. The EEM applet requires the specific 'EIGRP-3-SIA' syslog pattern, which is only generated when the SIA timer actually expires.
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 EIGRP SIA syslog message is only generated when the SIA timer expires, but a unidirectional link may prevent the query from being sent, so the timer never starts.
Why this is correct
Correct. If the unidirectional link prevents query transmission, the SIA timer is not triggered, and no syslog is generated.
- ✗
The EEM applet must use 'event eigrp' instead of 'event syslog' to catch EIGRP events.
Why it's wrong here
EEM can use either method, but 'event syslog' works if the correct pattern is matched.
- ✗
The EIGRP process must be restarted for the EEM applet to take effect.
Why it's wrong here
EEM applets are applied immediately after configuration.
- ✗
The unidirectional link causes a routing loop that suppresses syslog generation.
Why it's wrong here
Unidirectional links do not suppress syslog; they prevent proper EIGRP operation.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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