mediumMultiple Choice
350-401 Practice Question: Runs the following command on Router R8: R8# show…
A network engineer runs the following command on Router R8:
R8# show policy-map interface GigabitEthernet0/1
GigabitEthernet0/1
Service-policy output: QOS_POLICY
Class-map: VOICE (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: ip dscp ef (46) Queueing strict priority queue limit 64 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0 police cir 1000000 bc 15625 be 15625 conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
Class-map: DATA (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: ip dscp af31 (26) Queueing (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0 bandwidth remaining percent 50
Class-map: class-default (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any Queueing (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0 bandwidth remaining percent 50
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the ability to interpret zero counters in QoS output, trapping candidates who assume that configured policies (like policing or queuing) are actively dropping or shaping traffic without verifying the actual packet counts.
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 interface is not passing any traffic.
The output shows all counters at zero for every class, including the class-default, and the '5 minute offered rate' is 0 bps for all classes. This indicates that no packets have been processed by this policy-map on GigabitEthernet0/1, meaning the interface is not passing any traffic. The presence of policing and queuing configurations does not imply traffic is being dropped; the counters confirm zero activity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Voice traffic is being prioritized but not policed.
Why it's wrong here
This is incorrect because the interface statistics show zero packets and zero bytes for the voice class, meaning no voice traffic has been processed. Without actual traffic, you cannot determine whether voice is being prioritized or policed; prioritization (e.g., via `bandwidth` or `priority`) would only affect packets that are actually enqueued or transmitted. Moreover, the policy-map could include a `police` command for voice, but with no traffic, that policing action has never been exercised.
- ✓
The interface is not passing any traffic.
Why this is correct
This is correct because the output of `show policy-map interface` displays all class counters as zero, including classifications, bytes, and drops. A zero packet count across every class indicates that no packets have been classified or forwarded on this interface since the policy was attached. Therefore, the interface is not passing any traffic at all.
- ✗
Data traffic is being dropped due to policing.
Why it's wrong here
This is incorrect because the drop counters for the data classes are also zero, showing that no packets have been dropped. If data traffic were being policed and dropped, there would be non-zero drop counts displayed for the data class. Since all counters are zero, there is no evidence of any data packets being processed, let alone dropped due to policing.
- ✗
The policy-map is applied to input traffic.
Why it's wrong here
This is incorrect because the interface output explicitly states 'Service-policy output: [policy-name]', indicating that the policy-map is attached to the output (egress) direction. If it were applied to input, the output would read 'Service-policy input'. The direction field is a key part of the `show policy-map interface` command, and here it confirms this is an output policy.
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Senior Network & Security Engineer · founder of Courseiva
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