Quality of Service

Here you have the best Alcatel-Lucent 4A0-107 practice exam questions

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This questions were last updated on May 4, 2025

Question 1 of 48

Which of the following are possible criteria for classifying packets at the network port ingress on the Alcatel-Lucent 7750 SR? (Choose three)

The EXP bits in the MPLS header.

The packet's source and destination IP addresses.

The packet's DSCP bits.

The dot1p bits in the frame header.

The ID of an SDP that is transporting the packet.

Correct Answer: A, C, D

When classifying packets at the network port ingress on the Alcatel-Lucent 7750 SR, it is common to use criteria such as the EXP bits in the MPLS header, the packet's DSCP bits, and the dot1p bits in the frame header. These elements are typically used because they provide essential information for packet classification, which can be used for quality of service (QoS) and traffic management. The source and destination IP addresses, while useful for routing decisions, are not typically used as classification criteria at the port ingress in this context. The ID of an SDP that is transporting the packet is also not a standard criterion for packet classification at network port ingress.

Question 2 of 48

Click the exhibit button below. Given the slope-policy (below), which of the following statements are TRUE? (Choose two)

All out-of-profile traffic will be dropped before that of any in-profile traffic.

The discard probability slope of an in-profile traffic is steeper than that of an out-of-profile traffic.

When the shared buffer utilization reaches 55%, both in-profile and out-of-profile packets may be dropped.

The maximum probability with which an out-of-profile packet can be dropped is higher than that of an in-profile packet.

When the shared buffer utilization is at 61%, only in-profile packets are currently in the shared buffer pool.

Correct Answer: C, D

When the shared buffer utilization reaches 55%, both in-profile and out-of-profile packets may be dropped. This is because in-profile traffic (low-slope) starts getting discarded when the average utilization reaches 10%, and out-of-profile traffic (high-slope) starts getting discarded when the average utilization reaches 50%. The maximum probability with which an out-of-profile packet can be dropped is higher than that of an in-profile packet. This is evident from the maximum probability values in the policy: 60% for high-slope (out-of-profile) and 80% for low-slope (in-profile).

Question 3 of 48

To manage the shared buffer space at network ports, slope policies are applied on _________ for the ingress direction, and on ________ or _________ for the egress direction.

Interfaces, ports, SAPs

Ports, ports, MDAs

MDAs, MDAs, ports

Interfaces, interfaces. MDAs

MDAs, ports, interfaces

Correct Answer: B

To manage the shared buffer space at network ports, slope policies are applied on ports for the ingress direction, and on ports or MDAs for the egress direction.

Question 4 of 48

In the context of hierarchical scheduling, a scheduler is configured with a CIR weight of 0. Which of the following statements is TRUE?

The scheduler will be allocated its "within CIR" bandwidth before all other children at the same level have received their "within CIR" bandwidth.

The scheduler will be allocated its "within CIR" bandwidth after all other children at the same level have received their "within CIR" bandwidth.

The scheduler will be allocated its "within CIR" bandwidth after all other children at all levels have received their "within CIR" bandwidth.

The scheduler will not be allocated its "within CIR" bandwidth.

Correct Answer: D

In the context of hierarchical scheduling, the CIR (Committed Information Rate) weight indicates the priority of bandwidth allocation. If the scheduler has a CIR weight of 0, it means that it will not be allocated any bandwidth within the CIR because it has no guaranteed allocation. This makes option D the correct answer, as the scheduler with a CIR weight of 0 will not have its 'within CIR' bandwidth allocated.

Question 5 of 48

When using an egress port scheduler, on which scheduling loop are orphaned queues serviced?

Level 8 within CIR.

Level 8 between CIR and PIR.

Level 8, once all PIR is serviced.

Level 1 within CIR.

Level 1 between CIR and PIR.

Level 1, once all PIR is serviced.

Correct Answer: C

When using an egress port scheduler, orphaned queues are serviced at Level 8, once all PIR (Peak Information Rate) is serviced. This is because orphaned queues are typically given the lowest priority and are serviced only after all higher-priority queues (those within the PIR) have been attended to. This ensures that more critical traffic is handled first, and any leftover capacity is then used to process orphaned queues.