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.”
300-410 Embedded Event Manager (EEM) Practice Question
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.
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: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Embedded Event Manager (EEM) — This question tests Embedded Event Manager (EEM) — Static NAT maps one inside address to one outside address..
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?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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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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Question Discussion
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