hardMultiple Choice
350-401 Practice Question: Runs the following command on Router R6: R6# show…
A network engineer runs the following command on Router R6:
R6# show policy-map interface GigabitEthernet0/1
GigabitEthernet0/1
Service-policy output: QOS_POLICY
Class-map: VOICE (match-any) 500 packets, 50000 bytes 5 minute offered rate 50000 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) 500/50000 police cir 1000000 bc 15625 be 15625 conformed 500 packets, 50000 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
Class-map: DATA (match-any) 1000 packets, 100000 bytes 5 minute offered rate 100000 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) 1000/100000 bandwidth remaining percent 50
Class-map: class-default (match-any) 2000 packets, 200000 bytes 5 minute offered rate 200000 bps, drop rate 0 bps Match: any Queueing (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 2000/200000 bandwidth remaining percent 50
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between 'police' (which drops or marks excess traffic) and 'shape' (which buffers to a rate), and candidates mistakenly assume 'police cir' implies shaping or that any CIR command shapes all traffic.
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
✓
Data traffic is being guaranteed 50% of the remaining bandwidth.
The 'bandwidth remaining percent 50' command under the DATA class guarantees that class 50% of any bandwidth left unused by the strict-priority VOICE class. The policy-map is applied in the output direction, and the VOICE class uses a police (not shape) with a CIR of 1 Mbps, so only excess voice packets are dropped, not all traffic shaped. The class-default also gets 50% of the remaining bandwidth, confirming that the DATA class is indeed guaranteed 50% of the leftover bandwidth.
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 dropped because it exceeds the police rate.
Why it's wrong here
The police rate for the voice class is configured as 1 Mbps, but the actual offered load is only 50 kbps. Because the traffic rate is far below the configured police rate, the policer never triggers its exceed action, so no voice packets are dropped. Drops would occur only if voice traffic burst above the 1 Mbps police rate, which is not the case here.
- ✓
Data traffic is being guaranteed 50% of the remaining bandwidth.
Why this is correct
The `bandwidth remaining percent 50` command on the DATA class ensures that data packets receive 50% of the bandwidth that is left over after the strict-priority voice queue has been serviced. This is a proportional share of residual capacity, not an absolute fixed bandwidth guarantee. In a CBWFQ policy, this allows the data class to compete with other default classes using the remaining bandwidth percentage toward the total unallocated bandwidth.
- ✗
All traffic is being shaped to a CIR of 1 Mbps.
Why it's wrong here
Shaping is a mechanism that queues excess traffic and delays it to enforce a committed information rate (CIR), but the policy-map contains no `shape` command. The only rate-limiting action present is the `police` configured on the voice class, which drops offending packets rather than buffering them. Furthermore, the bandwidth remaining statements on the other classes simply allocate leftover queuing weight and do not impose any rate limit, so the policy does not shape all traffic to 1 Mbps.
- ✗
The policy-map is applied to input traffic.
Why it's wrong here
The policy-map is attached in the egress direction, as evidenced by the `service-policy output` statement in the interface configuration. Applying a policy-map to input traffic would require the `service-policy input` command and would perform ingress policing rather than egress queuing. Queuing actions such as `priority`, `bandwidth`, and `bandwidth remaining percent` are only meaningful in the output direction, so this policy must be an output policy.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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