Which of the following statements regarding scheduling on the Nokia 7750 SR is TRUE? (Choose two)

When using profile-mode queues, traffic that is marked as in-profile on ingress and scheduled in the above-CIR loop will still be considered as in-profile at egress.

The greater the difference between PIR and CIR rates in a queue, the less likely a CIR will be provided.

When using profile-mode queues, traffic that is marked as in-profile on ingress and scheduled in the above-CIR loop will still be considered as in-profile at egress.

When an HQoS strategy using an egress port-scheduler has been deployed, Tier 1 receives its scheduling rates based on the amount of egress bandwidth available for each forwarding class.

The greater the difference between PIR and CIR rates in a queue, the less likely a CIR will be provided.

Packets scheduled out of high-priority queues in the default scheduler will have a lower chance of packet loss at the expense of incurring a higher probability of delay.

When using priority-mode queues, traffic that is marked as in-profile on ingress and scheduled in the above-CIR loop will be considered as in-profile at egress.

When deploying a Nokia MPLS network with QoS, how are the EXP bits set?

The first 3 bits of the DSCP value are copied directly into the EXP field on the first network egress.

The EXP bits are set on the first network egress, based on a combination of the SAP-ingress classification and the network policy applied.

The first 3 bits of the DSCP value are copied directly into the EXP field on the first network egress.

The EXP bits are set on the first network egress, based on a combination of the SAP-ingress classification and the network policy applied.

The 3 priority bits are copied directly from the dot1p header into the EXP field of the first MPLS header.

The EXP bits are set based on a default map that translates DSCP codes into internal forwarding classes on SAP-ingress.

Which of the following statements describe the operation of WRED on the Nokia 7750 SR? (Choose three)

WRED uses the shared buffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.

WRED monitors the shared buffer space utilization over a period of time.

WRED disables the TCP slow-start congestion control mechanism.

WRED uses two configurable slopes for each buffer pool: a high slope and a low slope.

WRED uses the shared buffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.

WRED polices the shared buffer pool and marks all packets above a certain rate as 'discard eligible.'

Which of the following rate-limiting approaches are used on the Nokia 7750 SR? (Choose two)

Soft shaping at all network interfaces.

Soft shaping at network ingress only.

Shapeless policing at SAP-ingress only.

Shapeless policing at SAP-ingress and egress.

Biased round robin queuing at ingress only.

Soft shaping at all network interfaces.

Soft shaping at network ingress only.

Which of the following statements regarding the default scheduler in the Nokia 7750 SR are TRUE? (Choose two)

The H1 internal forwarding class will receive its CIR before AF traffic.

A queue servicing EF and AF traffic will require explicit configuration to set the queue to expedited.

There are a maximum of 8 levels of priority serviced using a round-robin algorithm.

The default scheduler will spend an equal amount of time in each queue, as long as there is traffic present

The H1 internal forwarding class will receive its CIR before AF traffic.

Orphaned queues will be scheduled out of the BE queue.

A queue servicing EF and AF traffic will require explicit configuration to set the queue to expedited.

How does an IOM3 improve the queue usage over an IOM2 in a Nokia 7750 SR? (Choose two)

The IOM3 only contains a single forwarding complex which reduces the number of queues used.

The IOM3 allows queues to be dynamically allocated between ingress and egress.

The IOM3 adds more memory to both forwarding complexes which increases the total number of queues available.

The IOM3 only contains a single forwarding complex which reduces the number of queues used.

The IOM3 allows multiple forwarding classes to be assigned to a single queue.

The IOM3 allows queues to be dynamically allocated between ingress and egress.

The IOM3 has a larger CPU capable of tracking active hardware queue utilization and adjusting memory allocation accordingly.

Which of the following statements about the consequences of congestion is TRUE?

Negative jitter results in a smaller than expected interval between transmitted packets.

Jitter does not have any effect on the quality of video applications.

Serialization delay is not affected by congestion.

Queuing delay is a fixed form of delay in networks.

Which of the following statements about the DiffServ and IntServ QoS models is FALSE?

Diffserv classifies packets into forwarding classes only at the first network hop.

IntServ uses a protocol like RSVP to provide QoS guarantees on a per-flow basis.

DiffServ groups multiple microflows into bigger streams called macro flows.

Intserv requires that network routers allocate resources for thousands of individual flows.

Diffserv classifies packets into forwarding classes only at the first network hop.

Which of the statements about packet classification is TRUE?

It sets the TOS, DSCP, EXP, or DOT1p field based on classification criteria.

It sets the destination IP address of the packet.

It uses RVSP to inform other QoS capable routers how the packet should be treated.

It sets the TOS, DSCP, EXP, or DOT1p field based on classification criteria.

It can use a customer's encapsulated data to determine a packet's forwarding class.

Which of the following egress points does NOT support egress reclassification?

Spoke-SDPs bound to a VPRN interface

Which of the following statements about configuring queues to use shared or reserved buffer space is FALSE?

When a queue is not using its reserved portion, other queues can use it.

When queues use shared buffer space, buffers are more efficiently utilized.

Queues that use reserved buffer space will have memory available for their reserved portion.

When a queue is not using its reserved portion, other queues can use it.

Using reserved buffer space prevents a queue from being starved of buffer resources by other queues.

Which of the following statements about buffer admission control techniques is FALSE?

Both high priority-only buffer space and WRED can be used in a queue.

A packet is accepted into a queue based on its priority and forwarding class.

Buffer admission control limits the number of out-of-profile packets that enter the queue.

Both high priority-only buffer space and WRED can be used in a queue.

Priority is used when a packet enters a SAP-ingress queue.

Which of the following is NOT a reason for configuring a slope policy on a queue?

To force the TCP algorithm to increase its transmission window upon detecting a congestion.

To have control over the amount of the low priority packets that enter the queue.

To control any traffic flowing through the shared buffer space of the queue.

To limit the number of the TCP sessions that go into slow start during congestion.

To force the TCP algorithm to increase its transmission window upon detecting a congestion.

A profile-mode queue is configured with MBS = 100 KB, CBS = 50 KB and High-Priority-Only = 40%. Assume there is no CBS overbooking, and the slope-policy is disabled. If the current queue depth is 70 KB, what will happen to an out-of-profile packet when it is transmitted to the queue?

It will be stored in the reserved buffer space and remain out-of-profile.

It will be stored in the reserved buffer space and become in-profile.

It will contend for shared buffer space with packets from other queues.

It will be discarded because the high-priority-only threshold has been reached.

Which of the following is NOT an advantage of deploying queue-groups on a network port?

It enables CFHP and hierarchy scheduling (egress) for each network interface.

It enables fine-tuned SLA control that is not possible when using a common set of queues for all L2/L3 services.

It enables CFHP and hierarchy scheduling (egress) for each network interface.

It improves scalability by allowing the use of queues instead of the default set of policers used on network egress.

It allows for enforcing bandwidth reservations of the LSPs that are used by the SDPs configured on the network interfaces.

A queue-group template can contain both queues and policers when applied under which conditions?

When applied at the port level for network egress.

When applied at the port level for access ingress.

When applied at the FP (Forwarding Pass) level for access ingress.

When applied at the FP (Forwarding Pass) level for network ingress.

When applied at the port level for network egress.

According to the SAP-egress policy configured and applied, which queue will forwarding class AF's traffic use?

Policer 2 on the queue-group Q-Group1 instance 1.

Policer 1 on the queue-group Q-Group1 instance 1.

Which of the following statements about scheduling on the Nokia 7750 SR is FALSE?

When using priority-mode queues, traffic marked as low-priority on ingress and scheduled in the above-CIR loop will be considered as in-profile at egress.

When using priority-mode queues, traffic marked as high-priority on ingress and scheduled in the above-CIR loop will be considered as out-of-profile at egress.

When using profile-mode queues, traffic marked as low-priority on ingress and scheduled in the above-CIR loop will be considered as out-of-profile at egress.

When using profile-mode queues, traffic marked as in-profile on ingress and scheduled in the above-CIR loop will still be considered as in-profile at egress.

Which of the following statements about a queue's rate parameters is FALSE?

If CIR = PIR, then all packets will be considered as in-profile.

Which of the following statements about burst-limit of a queue is FALSE?

If the burst-limit is not configured, a default burst-limit value will be used by the queue.

Burst-limit sets a limit on the maximum burst of packets transmitted during each scheduler visitation time.

Proper configuration of the burst-limit can prevent packet drops on the downstream nodes resulting from traffic bursts.

The lower the configured burst limit value, the lower the burst allowed to enter the queue.

If the burst-limit is not configured, a default burst-limit value will be used by the queue.

Which of the following statements about the default scheduler in the Nokia 7750 SR is FALSE?

The default scheduler spends an equal amount of time servicing each queue that has traffic to be sent out.

Queue-type can be configured as best-effort, expedite, or auto-expedite.

A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it.

A queue configured as auto-expedited will be an expedited queue as long as no Best Effort FC is mapped to it.

An IOM3 card of a Nokia7750 SR is enabled with the default scheduler and the policy shown in the image is applied to an access port on this card. In which order will packets be scheduled out of the queues?

Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

Queue 3 within-CIR packets, then queue 4 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

Queue 3 within-CIR packets, then queue 4 within-CIR packets, then queue 3 above-CIR packets, and finally queue 4 above-CIR packets.

Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 4 above-CIR packets, and finally queue 3 above-CIR packets.

Which of the following statements describes a queue's weight parameter that is used in the hierarchical scheduling?

The weight is used to determine how this queue and other queues or schedulers at the same level share available above CIR bandwidth at that level.

The weight specifies the priority of the queue during scheduling up to its CIR.

The weight specifies the priority of the queue during scheduling above-CIR, up to its PIR.

The weight is used to determine how this queue and other queues or schedulers at the same CIR-level share available CIR bandwidth at that level.

The weight is used to determine how this queue and other queues or schedulers at the same level share available above CIR bandwidth at that level.

Which of the following statements about configuring a hierarchical scheduler policy on a SAP is FALSE?

A queue's parent scheduler must be a Tier-3 scheduler.

Several Tier 1, Tier 2, and Tier 3 schedulers can be defined within a policy.

A queue's parent scheduler must be a Tier-3 scheduler.

The parent must have a higher level in the hierarchy.

If no parent is configured, the queue/scheduler is considered orphaned.

Which of the following components are NOT configured in a hierarchical scheduler policy?

Bandwidth controls that limit each child scheduler or child queues associated with the scheduler.

Queue parameters with which the queue will compete for bandwidth.

The level of hierarchy with which a group of schedulers is associated.

Bandwidth controls that limit each child scheduler or child queues associated with the scheduler.

The maximum bandwidth that the parent scheduler can offer its child queues or schedulers.

Which of the following statements about the bandwidth allocation criteria used by an egress port scheduler is TRUE?

Expedited queues must be serviced before best-effort queues.

The available bandwidth of the port is divided in a strict priority over its children.

Expedited queues must be serviced before best-effort queues.

Orphaned queues are serviced on the 8th scheduling priority.

The configured CIR dictates the maximum port bandwidth that can be allocated during the within-CIR pass for that level.

While deciding how to share the available bandwidth among its children, when does a port scheduler consider the parameter ''level'' of a child?

During the allocation of above-CIR bandwidth.

During the allocation of within-CIR bandwidth.

During the allocation of above-CIR bandwidth.

During the allocation of both within-CIR and above-CIR bandwidth.

The port scheduler does not use the level of a child for making bandwidth allocation decisions

An egress port scheduler applied to an Ethernet port has a configured bandwidth of 100 Mbps. All frames transmitted on the port are 80 bytes. What is the aggregate transmit bandwidth of all queues using the port scheduler?

100Mbps * 20/(80 + 20) = 20 Mbps

100Mbps * 80/(80 + 20) = 80 Mbps

100+ 100 * 20/(80 + 20) = 120 Mbps

Nokia 4A0-107 Practice Test 4 - Free Online Exam Prep & Questions

On the Nokia 7750 SR, what is a slope policy used for?

A.

Defining the slope of the TCP slow-start mechanism for self generated traffic.

B.

Defining the slope of the scheduling rate per forwarding class when using HQoS.

C.

Defining the high and low slope values when deploying buffer admission control for UDP traffic in the committed buffer pool.

D.

Defining the high and low slope values when deploying buffer admission control for TCP traffic in the shared buffer pool.

E.

Defining the high and low slope values when deploying buffer admission control for TCP traffic in the committed buffer pool.

Nokia 4A0-107 Practice Test 4

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Nokia 4A0-107 Practice Tests

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