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Route Maps and Route Filtering →hardMultiple ChoiceObjective-mapped

300-410 Route Maps and Route Filtering Practice Question

This 300-410 practice question tests your understanding of route maps and route filtering. 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 Control Plane Policing (CoPP) with a policy map that includes a class-map matching BGP traffic. The policy map has a 'police' action that sets the rate-limit in bps. After applying the policy to the control plane, BGP sessions start flapping. 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
The police rate is configured in bps, but BGP keepalives are small packets; pps should be used to avoid dropping.
bps rate-limit can drop many small packets; pps is recommended for control plane traffic.
B
The class-map matches BGP traffic incorrectly; it should match on protocol BGP.
Why wrong: Class-maps can match on protocol; the issue is rate unit.
C
The policy map is applied to the control plane inbound, but BGP packets are sent outbound.
Why wrong: BGP uses TCP, which is bidirectional; inbound policing affects received packets.
D
The default class is not configured, causing all other traffic to be dropped.
Why wrong: Default class does not affect BGP if it is matched in a specific class.

Full breakdown with real-world context →

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 police rate is configured in bps, but BGP keepalives are small packets; pps should be used to avoid dropping.

CoPP rate-limits are often configured in bps by default, but for control plane traffic, pps (packets per second) is more appropriate. If the rate-limit is set in bps, it may be too low for BGP keepalive packets, which are small. The edge case is that the engineer used bps instead of pps, causing the policer to drop BGP packets.

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.

✓
The police rate is configured in bps, but BGP keepalives are small packets; pps should be used to avoid dropping.
Why this is correct
bps rate-limit can drop many small packets; pps is recommended for control plane traffic.
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 class-map matches BGP traffic incorrectly; it should match on protocol BGP.
Why it's wrong here
Class-maps can match on protocol; the issue is rate unit.
✗
The policy map is applied to the control plane inbound, but BGP packets are sent outbound.
Why it's wrong here
BGP uses TCP, which is bidirectional; inbound policing affects received packets.
✗
The default class is not configured, causing all other traffic to be dropped.
Why it's wrong here
Default class does not affect BGP if it is matched in a specific class.

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?

Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The police rate is configured in bps, but BGP keepalives are small packets; pps should be used to avoid dropping. — CoPP rate-limits are often configured in bps by default, but for control plane traffic, pps (packets per second) is more appropriate. If the rate-limit is set in bps, it may be too low for BGP keepalive packets, which are small. The edge case is that the engineer used bps instead of pps, causing the policer to drop BGP packets.

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.

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