- A
The applet will send an email to the administrator whenever an OSPF adjacency change occurs.
Correct. The applet triggers on the OSPF adjacency change syslog message and sends an email with the specified details.
- B
The applet will only execute the CLI commands and will not send an email because the mail server is not configured globally.
Why wrong: Incorrect. The 'mail server' command is specified directly in the action; no global mail configuration is required.
- C
The applet will fail because the 'event syslog pattern' must be configured with a regular expression.
Why wrong: Incorrect. The pattern can be a simple string; regular expressions are optional.
- D
The applet will send the email only after the CLI commands complete, but the output of those commands is not included in the email.
Why wrong: Incorrect. The CLI commands are executed, but their output is not automatically included in the email. The email body is static as defined.
Quick Answer
The correct answer is that the EEM applet will send an email to the administrator whenever an OSPF adjacency change occurs. This is because the event syslog pattern "OSPF-5-ADJCHG" triggers the applet, and the action 3.0 mail command sends the notification, while the intervening cli commands simply execute show commands without affecting the email delivery. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of how EEM for OSPF adjacency change notification works, specifically that the syslog trigger is the key event and that the mail action is independent of the CLI output. A common trap is assuming the applet fails if the show commands produce no output, but the email sends regardless as long as the mail server is reachable. Remember: the mail action is the star of the show—the CLI commands are just window dressing.
300-410 Embedded Event Manager (EEM) Practice Question
This 300-410 practice question tests your understanding of embedded event manager (eem). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Consider the following EEM applet configuration:
!--- event manager applet CHECK_OSPF event syslog pattern "OSPF-5-ADJCHG" action 1.0 cli command "enable" action 2.0 cli command "show ip ospf neighbor" action 3.0 mail server "smtp.example.com" to "admin@example.com" from "router@example.com" subject "OSPF Adjacency Change" body "An OSPF adjacency change has been detected." !---
What is the effect of this configuration?
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 applet will send an email to the administrator whenever an OSPF adjacency change occurs.
The EEM applet triggers on a syslog message matching the pattern "OSPF-5-ADJCHG". When triggered, it sends an email notification to the administrator. The 'cli command' actions are executed but their output is not used; the email is sent regardless. The applet does not require any additional configuration to send the email, provided the mail server is reachable.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 applet will send an email to the administrator whenever an OSPF adjacency change occurs.
- ✗
The applet will only execute the CLI commands and will not send an email because the mail server is not configured globally.
Why it's wrong here
Incorrect. The 'mail server' command is specified directly in the action; no global mail configuration is required.
- ✗
The applet will fail because the 'event syslog pattern' must be configured with a regular expression.
Why it's wrong here
Incorrect. The pattern can be a simple string; regular expressions are optional.
- ✗
The applet will send the email only after the CLI commands complete, but the output of those commands is not included in the email.
Why it's wrong here
Incorrect. The CLI commands are executed, but their output is not automatically included in the email. The email body is static as defined.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
Incorrect. The 'mail server' command is specified directly in the action; no global mail configuration is required.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Embedded Event Manager (EEM) — This question tests Embedded Event Manager (EEM) — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The applet will send an email to the administrator whenever an OSPF adjacency change occurs. — The EEM applet triggers on a syslog message matching the pattern "OSPF-5-ADJCHG". When triggered, it sends an email notification to the administrator. The 'cli command' actions are executed but their output is not used; the email is sent regardless. The applet does not require any additional configuration to send the email, provided the mail server is reachable.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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