A packet is to be encapsulated inside an MPLS tunnel which consists of two MPLS headers at the first network egress. Which of the MPLS EXP fields will be marked?

The EXP field in both the top and bottom MPLS headers will be marked.

The EXP field in the bottom MPLS header will be marked.

The EXP field in both the top and bottom MPLS headers will be marked.

For Layer 2 services, the top MPLS header will be marked; for Layer 3 services, the bottom MPLS header will be marked.

The EXP field in the top MPLS header will be marked.

Neither the top nor the bottom EXP field will be marked since EXP remarking can only be done on the network ingress.

Which of the following statements are TRUE regarding the building of a QoS-enabled network? (Choose two)

Packet enters a node will be treated as per the local hop's configured policy.

Native IP packets entering a network port will not be marked at the first network egress by default.

It is important that all packets are classified in the same way at all SAP-ingress points.

Once a packet is classified to a forwarding class, it cannot change across the network.

Packet enters a node will be treated as per the local hop's configured policy.

Native IP packets entering a network port will be marked at the first network egress by default

Native IP packets entering a network port will not be marked at the first network egress by default.

Native IP packets entering a network port will be marked at the first network egress, regardless of the re-marking configuration.

Which of the following statements are TRUE regarding the remarking of packets arriving on the network interface whose ToS-marking-state is set to trusted and remarking enabled on network egress? (Choose two)

Native IP Packets will be remarked.

Packets associated with an ES service on an upstream node will be remarked.

Native IP Packets will not be remarked.

Native IP Packets will be remarked.

Packets associated with a VPRN service on an upstream node will not be remarked.

Packets associated with an ES service on an upstream node will be remarked.

Which of the following statements BEST defines policing?

The process of discarding packets within a traffic stream in accordance with the state of a meter to enforce a defined traffic profile.

The process of delaying packets within a traffic stream to have them conform to a defined traffic profile.

The overall treatment of a defined subset of a customer's traffic within a DiffServ domain.

The process of discarding packets within a traffic stream in accordance with the state of a meter to enforce a defined traffic profile.

The action of setting the DiffServ codepoint of a packet prior to its entry into a downstream DiffServ domain.

A specified algorithm or operation that is implemented in a node in order to realize one or more per-hop behaviors.

Without_______, a customer's high priority traffic can be dropped before its low priority traffic.

prioritization of traffic flows

separation between the data plane and the control plane

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

All AF traffic will be marked 'in-profile' at the SAP-ingress.

EF traffic will receive higher scheduling priority than H2 traffic.

Traffic that does not match any of the IP criteria will be placed in queue 3.

All AF traffic will be marked 'in-profile' at the SAP-ingress.

All TCP traffic will be mapped to forwarding class EF.

UDP traffic is placed in queue 3 while ICMP traffic is placed in queue 5.

EF traffic will receive higher scheduling priority than H2 traffic.

Traffic that does not match any of the IP criteria will be placed in queue 3.

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

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

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

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

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

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

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

A queue is configured with the following attributes:MBS = 10KBCBS = 5KBHigh-Priority-Only = 30%Assume that there is no CBS overbooking and that the slope-policy is disabled. If the current queue depth is 8KB, what will happen to an in-profile packet arriving in the queue?

It will be queued in the shared portion of the buffer pool but contend for shared buffer space with packets from other queues.

It will be discarded because the high-priority-only threshold is exceeded.

It will be queued but re-marked as 'out-of-profile.'

It will be queued in the reserved portion of the buffer pool and remain 'in-profile.'

It will be queued in the shared portion of the buffer pool but contend for shared buffer space with packets from other queues.

It will be queued in the shared portion of the buffer pool but may be dropped if the buffer utilization exceeds the start-average value of the low slope.

Click the exhibit button below. Given that the slope-policy (below) has been enabled and applied on a network port, which of the following statements are TRUE? (Choose three)

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

When the shared buffer utilization reaches 51%, in-profile packets might be dropped.

When an in-profile packet arrives and the shared buffer utilization is at 69%, the packet will have approximately a 60% likelihood of being discarded.

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

The time average factor of 0 will discard all packets arriving in the shared buffer pool.

When the shared buffer utilization reaches 51%, in-profile packets might be dropped.

The highest probability with which an out-of-profile packet can be dropped is 20%.

When an in-profile packet arrives and the shared buffer utilization is at 69%, the packet will have approximately a 60% likelihood of being discarded.

When allocating scheduling resources, which of the following statements BEST describes how the egress port scheduler allocates bandwidth?

The egress port scheduler allocates bandwidth based on a WRR distribution method that takes into account the CIR and PIR requested at each level and the max speed, either default or configured, on egress.

The egress port scheduler takes the ratio of requested bandwidth to total bandwidth request from all children. It allocates bandwidth fairly, using these percentages and not exceeding the egress interface speed.

The egress port scheduler allocates bandwidth based on a WRR distribution method that takes into account the CIR and PIR requested at each level and the max speed, either default or configured, on egress.

The egress port scheduler allocates bandwidth on a first come, first served distribution method that takes into account the total CIR and PIR requested at each level and the max PIR requested from a single level.

The egress port scheduler will limit the bandwidth offered to the egress port based on the over-subscription factor, provisioned under the router interface, while using a WRR scheduler for the remaining bandwidth.

The egress port scheduler will use the Russian Dolls Method to allocate bandwidth to each level of requested bandwidth. HPO-Only is automatically set to 100%, allowing only high priority traffic to be buffered during congestion.

Click the exhibit button below. All interfaces are using their default trust states and MPLS is used as the transport tunnel. The SAP-ingress, SAP-egress, and network QoS policies have been configured as shown below. Assume that the default network-queue policy is used on each router.At router PE 1, customer traffic is arriving marked with DSCP BE and tagged with a dot1p value of 3.Based on the configuration shown below for the VPRN service, what will be the DSCP and dot1p marking for the packet egressing at router PE 2? (Choose two)

The DSCP value will be set to af 12.

The DSCP value will be set to af21.

The DSCP value will be set to be.

The DSCP value will be set to af 12.

The dot1p value will be set to 3.

When deploying an 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.'

Click the exhibit button below. Given the scheduler-policy (below), which of the following can be done to guarantee that the best-effort traffic receives its configured CIR value?

Change the CIR-level value for the best-effort queue to 8.

Change the CIR-weight value of the AF queue to 0.

Change the CIR-level value for the best-effort queue to 8.

Do not change anything; it is already guaranteed to receive its CIR

Change the CIR-level value for the best-effort queue to 1.

Change the CIR-weight value of the AF queue to 0.

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 are TRUE regarding the PE device in a QoS enabled network? (Choose two)

A device that classifies and marks customer traffic.

A device that creates macroflows towards the core from multiple customer sites.

A device that provides no differentiation between customer traffic flows.

A device that classifies and marks customer traffic.

A device that uses MPLS EXP bits to differentiate between traffic flows.

A device that creates macroflows towards the core from multiple customer sites.

A device that passes macroflows while optionally changing QoS markings.

Click the exhibit button below. A network operator has configured a network-queue policy to map forwarding classes to queues, as shown in the exhibit below. Based on the default scheduling behavior of the Nokia 7750 SR, in which order will packets be serviced?

In-profile EF packets, then in-profile H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

All in-profile packets in round-robin, then all out-of-profile packets in biased round-robin.

In-profile EF packets, then in-profile H2 packets, then in-profile AF packets, then out-of-profile EF packets, then out-of-profile H2 and AF packets, and then out-of-profile BE packets.

In-profile EF, H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

In-profile EF packets, then in-profile H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

In-profile EF and H2 packets, then in-profile AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

Which of the following statements regarding scheduling are TRUE? (Choose two)

Scheduler policies can be applied to the MDA to schedule network ingress traffic.

Every time a scheduler-policy is assigned to a SAP, a new hardware scheduler is created to service the SAP.

Scheduler policies cannot be children of an egress port-scheduler.

HQoS provides a static method of allocating scheduling resources to each queue and/or child.

Scheduler policies can be applied to the MDA to schedule network ingress traffic.

Every time a scheduler-policy is assigned to a SAP, a new hardware scheduler is created to service the SAP.

A scheduler applied to multiple SAPs within the same service will result in a single hardware scheduler operating across all SAPs within the service.

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 an 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 BEST describes the IntServ model?

Uses the RSVP protocol to create microflows through a network.

Has the ability to distinguish traffic in 32 different ways.

Uses the RSVP protocol to create microflows through a network.

Has the ability to manually configure foiwarding classes through a network.

Uses the RSVP protocol to create macroflows through a network.

Which of the following are major components of QoS functionality on the Nokia 7750 SR? (Choose three)

Microflow reservations using RSVP

Automatic profiling and policy configuration

On a Nokia IOM 3, how is buffer memory allocated per forwarding complex?

768 MB dynamically allocated between ingress and egress.

1 GB dynamically allocated between ingress and egress.

768 MB dynamically allocated between ingress and egress.

768 MB, with a minimum of 256 MB ingress and egress, and an additional 256 MB dynamically allocated.

Which of the following statements regarding policing and shaping on the Nokia 7750 SR are TRUE? (Choose two)

When policing is enabled on the SAP-ingress, all traffic is considered as in-profile.

Setting the CIR and PIR to equal values disables soft-policing.

The larger the configured MBS value, the lower the amount of shaping performed.

When policing is enabled on the SAP-ingress, all traffic is considered as in-profile.

Setting the CIR to 1000 and the PIR to max will enable shapeless policing at 1 Mbps within the SAP-egress policy.

Configuring MBS to equal CBS will disable shaping.

Setting the CIR and PIR to equal values disables soft-policing.

Nokia 4A0-107 Practice Test 3 - Free Online Exam Questions 81-120

Which of the following statements are TRUE when discussing self-generated traffic QoS? (Choose two)

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