Question 281 of 505

Infrastructure and Automation →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that traffic from 10.0.0.0/24 with DSCP EF is re-marked to AF41 and limited to 100 Mbps, with excess dropped. This behavior stems directly from the YANG/JSON QoS policy with policing, where the JSON structure defines a class map matching the source subnet and DSCP EF, then applies a police action that re-marks exceeding traffic to AF41 while dropping it once the rate surpasses 100 Mbps. In Cisco IOS, this is a standard two-rate policer: conforming traffic passes unchanged, while exceeding traffic is both re-marked and dropped. On the DevNet Associate 200-901 exam, this tests your ability to read a JSON-based QoS policy and map it to NETCONF/YANG device behavior—a common trap is assuming all exceeding traffic is merely dropped without re-marking, but the JSON explicitly specifies both actions. Remember the mnemonic “Conform keep, exceed re-drop” to recall that conforming traffic is untouched, while exceeding traffic is re-marked and then dropped.

200-901 Infrastructure and Automation Practice Question

This 200-901 practice question tests your understanding of infrastructure and automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.

Exhibit

Refer to the exhibit.

{
  "policy": {
    "name": "QoS-Policy",
    "match": {
      "dscp": "EF",
      "source_ip": "10.0.0.0/24"
    },
    "action": {
      "set_dscp": "AF41",
      "police": {
        "cir": "100000000",
        "bc": "10000000",
        "conform_action": "transmit",
        "exceed_action": "drop"
      }
    }
  }
}

Refer to the exhibit. A network engineer applies this JSON-based QoS policy to a Cisco device using NETCONF/YANG. Which statement best describes the expected behavior for traffic from 10.0.0.0/24 with DSCP EF?

Clue words in this question

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

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

Question 1hardmultiple choice

Study the full QoS explanation →

Exhibit

Refer to the exhibit.

{
  "policy": {
    "name": "QoS-Policy",
    "match": {
      "dscp": "EF",
      "source_ip": "10.0.0.0/24"
    },
    "action": {
      "set_dscp": "AF41",
      "police": {
        "cir": "100000000",
        "bc": "10000000",
        "conform_action": "transmit",
        "exceed_action": "drop"
      }
    }
  }
}

A
Traffic with DSCP EF from any source is re-marked to AF41 and dropped if exceeding 100 Mbps.
Why wrong: The policy only matches source 10.0.0.0/24.
B
The policy is invalid because DSCP values cannot be changed in a QoS policy.
Why wrong: DSCP re-marking is a common QoS action.
C
Traffic from 10.0.0.0/24 with DSCP EF is re-marked to AF41 and limited to 100 Mbps; excess is dropped.
The policy matches both conditions, then re-marks and polices.
D
Traffic from 10.0.0.0/24 is re-marked to DSCP EF, then policed at 100 Mbps.
Why wrong: The policy matches DSCP EF, not sets it.

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

✓

Traffic from 10.0.0.0/24 with DSCP EF is re-marked to AF41 and limited to 100 Mbps; excess is dropped.

Option C is correct because the JSON-based QoS policy uses a class map matching traffic from source 10.0.0.0/24 with DSCP EF, then applies a police action that re-marks exceeding traffic to AF41 and drops it when the rate exceeds 100 Mbps. This is a standard two-rate policer behavior in Cisco IOS QoS, where conforming traffic is transmitted unchanged and exceeding traffic is re-marked and dropped.

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.

✗
Traffic with DSCP EF from any source is re-marked to AF41 and dropped if exceeding 100 Mbps.
Why it's wrong here
The policy only matches source 10.0.0.0/24.
✗
The policy is invalid because DSCP values cannot be changed in a QoS policy.
Why it's wrong here
DSCP re-marking is a common QoS action.
✓
Traffic from 10.0.0.0/24 with DSCP EF is re-marked to AF41 and limited to 100 Mbps; excess is dropped.
Why this is correct
The policy matches both conditions, then re-marks and polices.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Traffic from 10.0.0.0/24 is re-marked to DSCP EF, then policed at 100 Mbps.
Why it's wrong here
The policy matches DSCP EF, not sets it.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between matching criteria (source IP and DSCP) versus the action applied (re-marking and policing), leading candidates to confuse which traffic is matched and what happens to conforming versus exceeding packets.

Detailed technical explanation

How to think about this question

Under the hood, the NETCONF/YANG configuration translates to a Cisco modular QoS CLI (MQC) policy where the police command uses a 'conform-action transmit' and 'exceed-action set-dscp af41 drop' behavior. In real-world scenarios, this is used to protect premium voice traffic (DSCP EF) from a specific subnet while allowing best-effort re-marking for bursts above the committed rate, ensuring that voice quality is maintained for conforming packets.

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.

TExam Day Tips

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 200-901 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 200-901 question test?

Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Traffic from 10.0.0.0/24 with DSCP EF is re-marked to AF41 and limited to 100 Mbps; excess is dropped. — Option C is correct because the JSON-based QoS policy uses a class map matching traffic from source 10.0.0.0/24 with DSCP EF, then applies a police action that re-marks exceeding traffic to AF41 and drops it when the rate exceeds 100 Mbps. This is a standard two-rate policer behavior in Cisco IOS QoS, where conforming traffic is transmitted unchanged and exceeding traffic is re-marked and dropped.

What should I do if I get this 200-901 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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