Question 545 of 2,152

Embedded Event Manager (EEM) →hardMultiple ChoiceObjective-mapped

EEM CoPP and uRPF Drop syslog — Missing Log Keyword

This 300-410 practice question tests your understanding of embedded event manager (eem). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.

An engineer configures an EEM applet to monitor CoPP (Control Plane Policing) drops using the event syslog pattern 'COPP-3-DROP'. The applet is intended to log when CoPP drops packets. The CoPP policy is applied with a rate-limit in bps, but the traffic exceeds the rate, and packets are dropped. The EEM applet does not trigger. Which is the most likely explanation?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
CoPP does not generate syslog messages for individual drops unless the 'log' keyword is configured in the policy.
Correct. CoPP drops are not logged by default; the 'log' keyword must be added to the police action.
B
The EEM applet must use 'event class-map' to capture CoPP events.
Why wrong: EEM does not have a native class-map event trigger.
C
The rate-limit in bps is incorrect; it should be in pps to generate syslog.
Why wrong: The rate-limit unit does not affect syslog generation.
D
The CoPP policy must be applied to the input direction only for drops to be logged.
Why wrong: Direction does not affect whether drops are logged.

Full breakdown with real-world context →

Quick Answer

The answer is that the CoPP policy must include the **log** keyword for individual drops to generate a syslog message, without which the EEM applet monitoring the 'COPP-3-DROP' pattern will never trigger. CoPP suppresses per-packet syslog generation by default to prevent CPU overload; the **COPP-3-DROP** message only appears when the drop rate crosses a built-in threshold or when the **log** keyword is explicitly added to the **police** command in the policy-map. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding that EEM event syslog triggers depend entirely on the underlying feature generating the log—CoPP does not log every drop, and **uRPF** drops similarly require explicit logging configuration. A common trap is assuming any drop automatically produces a syslog, but the reality is that both CoPP and uRPF drops are silent unless logging is enabled. Memory tip: “No log, no log—CoPP drops stay quiet without the keyword.”

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

✓

CoPP does not generate syslog messages for individual drops unless the 'log' keyword is configured in the policy.

CoPP generates syslog messages only when the drop rate exceeds a certain threshold or when the policy is applied, not for every individual drop. By default, CoPP does not generate syslog messages for every dropped packet because it would overwhelm the router. The 'COPP-3-DROP' syslog is generated only if the 'police' action includes the 'log' keyword or if the drop rate is significant enough to trigger a log. Without explicit logging configuration in the CoPP policy, no syslog is generated, and the EEM applet will not trigger.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
CoPP does not generate syslog messages for individual drops unless the 'log' keyword is configured in the policy.
Why this is correct
Correct. CoPP drops are not logged by default; the 'log' keyword must be added to the police action.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The EEM applet must use 'event class-map' to capture CoPP events.
Why it's wrong here
EEM does not have a native class-map event trigger.
✗
The rate-limit in bps is incorrect; it should be in pps to generate syslog.
Why it's wrong here
The rate-limit unit does not affect syslog generation.
✗
The CoPP policy must be applied to the input direction only for drops to be logged.
Why it's wrong here
Direction does not affect whether drops are logged.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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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) — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: CoPP does not generate syslog messages for individual drops unless the 'log' keyword is configured in the policy. — CoPP generates syslog messages only when the drop rate exceeds a certain threshold or when the policy is applied, not for every individual drop. By default, CoPP does not generate syslog messages for every dropped packet because it would overwhelm the router. The 'COPP-3-DROP' syslog is generated only if the 'police' action includes the 'log' keyword or if the drop rate is significant enough to trigger a log. Without explicit logging configuration in the CoPP policy, no syslog is generated, and the EEM applet will not trigger.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A network engineer configures an EEM applet to monitor uRPF (Unicast Reverse Path Forwarding) failures using the event syslog pattern 'IP-3-URPF'. The applet is designed to log when uRPF drops packets due to strict mode. The network has asymmetric routing, and packets are dropped. The EEM applet does not trigger. Which is the most likely explanation?

hard

✓ A.uRPF strict mode drops packets silently without generating a syslog message unless the 'log' keyword is used.
B.The EEM applet must use 'event routing' to capture uRPF events.
C.Asymmetric routing causes uRPF to generate a different syslog pattern, such as 'IP-4-URPF'.
D.The uRPF must be configured in loose mode to generate syslog messages.

Why A: uRPF strict mode drops packets when the source IP address is not reachable via the incoming interface. However, the syslog message 'IP-3-URPF' is generated only when the 'ip verify unicast source reachable-via' command is configured with the 'allow-default' option or when the drop is logged explicitly. In strict mode without 'allow-default', the router may drop packets silently without generating a syslog message, especially if the drop is due to asymmetric routing. The EEM applet will not trigger because no syslog is generated for the drop.

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