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200-901 Infrastructure and Automation Practice Question

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?

⚠ Common exam trap

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.

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.

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.

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.
✗
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.

Go deeper

200-901 Infrastructure and Automation Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

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