Question 1

A profile-mode queue is configured with the following attributes: MBS = 10 KB, CBS = 5 KB and High-Priority-Only = 30%. Assume there is no CBS overbooking, and the slope-policy is disabled. If the current queue depth is 8 KB, what will happen to an in-profile packet?
A) It will be discarded because the high-priority-only threshold is exceeded.
B) It will be stored in the queue's reserved buffer space and become out-of-profile.
C) It will be stored in the queue's reserved buffer space and remain in-profile.
D) It will contend for shared buffer space with packets from other queues.

Accepted Answer

The answer of A profile-mode queue is configured with the...

Question 2

Which action should be taken to ensure that packets do not use the shared buffer space when put into a queue?
A) Set the queue's CBS to 0
B) Set the queue's MBS equal to the CBS
C) Set the queue's high-priority-only equal to the MBS
D) Set the queue's MBS to 0
E) Set the queue's high-priority-only to 0

Accepted Answer

Setting the queue's Maximum Burst Size (MBS) equal to the Committed Burst Size (CBS) ensures that packets do not exceed the committed rate and thus do not use the shared buffer space.

Question 3

Assume all transmitted frames on a SONET port are 1500 bytes and that the average frame overhead has been configured as 10%. If the total bandwidth of all queues, excluding overhead, needs to be guaranteed at 55 Mbps, how much bandwidth should be configured for the egress port scheduler applied on that port?
A) 55 Mbps / 1.1 = 50 Mbps
B) 55 Mbps
C) 55 Mbps + 55 Mbps * 0.1 / 1.1 = 60 Mbps
D) 55 Mbps * 1.1 = 60.5 Mbps

Accepted Answer

To account for the 10% overhead, the bandwidth should be increased by 10% of the required 55 Mbps, resulting in 55 Mbps * 1.1 = 60.5 Mbps.

Question 4

When using an egress port scheduler, which scheduling loop priority are orphaned queues serviced on?
A) 1st
B) 8th
C) 9th
D) 17th

Accepted Answer

The answer of When using an egress port scheduler, which...

Question 5

Which of the following statements about the default scheduler in the Nokia 7750 SR is TRUE?
A) A queue will be serviced as expedited if all of the forwarding classes mapped to it are expedited, regardless of its configured type.
B) A queue will be serviced as best-effort if all of the forwarding classes mapped to it are best-effort, regardless of its configured type.
C) A queue will be serviced as expedited if at least one of the forwarding classes mapped to it is expedited, regardless of its configured type.
D) A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it.

Accepted Answer

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

Question 6

According to the configuration shown above, which of the following about the classification and marking of self-generated BGP traffic is TRUE?
A) It will be marked as DSCP BE and classified into forwarding class BE.
B) It will be marked as DSCP NC1 and classified into forwarding class BE.
C) It will be marked as DSCP NC1 and classified into forwarding class NC.
D) It will be marked as DSCP NC1 and classified into forwarding class AF.

Accepted Answer

The answer of  According to the configuration shown above,...

Question 7

Forwarding sub-classes are configured in the context of which QoS policy type?
A) Network
B) Scheduler
C) Slope
D) SAP-ingress
E) Network queue

Accepted Answer

Forwarding sub-classes are configured in the context of SAP-ingress QoS policy type, which deals with how traffic is managed as it enters a service access point (SAP).

Question 8

What type of unwanted packet drops can the proper configuration of a queue's burst-limit parameter prevent?
A) Packet drops in the local queue resulting from traffic congestion.
B) Packet drops on the downstream nodes resulting from traffic congestion.
C) Packet drops in the local queue resulting from traffic bursts.
D) Packet drops on the downstream nodes resulting from traffic bursts.

Accepted Answer

The burst-limit parameter in a queue configuration is designed to handle traffic bursts, preventing packet drops in the local queue when there is a sudden increase in traffic.

Question 9

Which of the following statements about the token buckets of a policer is TRUE?
A) When a packet arrives, the PIR bucket depth is checked and the packet is discarded if this bucket is full.
B) The CIR bucket of a policer is the reserved portion of its PIR bucket.
C) The CIR bucket of a policer has two thresholds: CBS and HPO.
D) Packets processed by the PIR bucket at an average rate above PIR will be forwarded as out-of-profile.

Accepted Answer

When a packet arrives, the PIR bucket depth is checked, and if the bucket is full, the packet is discarded. This is a mechanism to ensure that traffic does not exceed the peak information rate (PIR).

Question 10

Which of the following about scheduling is TRUE?
A) HQoS schedulers cannot be children of an egress port-scheduler.
B) HQoS schedulers provide a dynamic method of allocating scheduling resources to queues.
C) HQoS scheduler policies can be applied to an MDA to schedule network ingress traffic.
D) A scheduler policy applied to multiple SAPs within the same service will result in a single hardware scheduler operating across all SAPs within the service.

Accepted Answer

The answer of Which of the following about scheduling is...

Question 11

Which of the following is an example of something that CAN be done with hierarchical policing (CFHP) but CANNOT be done with standalone policers?
A) Limiting the maximum forwarding rate of each individual policer and, at the same time, marking, packets as in-profile or out-of-profile.
B) Putting packets in a buffer as they are received, and marking packets as in-profile or out-of-profile as they are removed from the buffer.
C) Rate-limiting the collective output of several policers, and to reallocate bandwidth that is not utilized by some policers to other policers that need to use it.
D) Rate-limiting the collective output of several policers towards each egress FFPC, while maintaining control of the maximum overall forwarding rate.

Accepted Answer

The answer of Which of the following is an example...

Question 12

Which of the following is NOT a valid configuration value for a queue's CIR parameter within a SAP-ingress policy?
A) 0
B) min
C) max
D) 50000

Accepted Answer

The CIR (Committed Information Rate) parameter typically requires a numerical value, and "min" is not a valid numerical configuration for CIR.

Question 13

Which priority-mode queue parameter may influence both the profile marking, and scheduling priority of a queue?
A) PIR
B) CIR
C) MBS
D) burst-limit

Accepted Answer

The answer of Which priority-mode queue parameter may influence both...

Question 14

Which of the following QoS functions does the slope policy perform?
A) Classification
B) Marking
C) Buffer admission control
D) Scheduling

Accepted Answer

The slope policy is related to buffer admission control, which manages how packets are admitted into a buffer based on certain criteria to prevent congestion and ensure quality of service.

Question 15

Which of the following fields in packets belonging to a Layer 3 service can be pre-marked on SAP-ingress?
A) Dot1p
B) DEI
C) EXP
D) DSCP/PREC

Accepted Answer

DSCP/PREC is a field in the IP header at Layer 3 that can be pre-marked on SAP-ingress to indicate the priority of the packet for Quality of Service (QoS) purposes.

Question 16

If two queues complete for bandwidth in a hierarchical scheduler environment, which parameter is used by their parent scheduler to determine the priority with which each queue can use bandwidth above its committed rate?
A) level
B) cir-level
C) weight
D) cir-weight

Accepted Answer

The "weight" parameter is used by the parent scheduler to determine the priority with which each queue can use bandwidth above its committed rate in a hierarchical scheduler environment.

Question 17

Which of the following about the process of queuing self-generated traffic in the Nokia 7750 SR is TRUE?
A) Ingress traffic is stored in IOM queues and egress traffic is stored in CPM queues.
B) Ingress traffic is stored in CPM queues and egress traffic is stored in IOM queues.
C) It is always stored in CPM queues.
D) It is always stored in IOM queues.

Accepted Answer

The answer of Which of the following about the process...

Question 18

A queue-group template can only contain policers (no queues) when applied under which conditions?
A) When applied at the FP (Forwarding Path) level for access egress
B) When applied at an access port for ingress or egress
C) When applied at the FP (Forwarding Pass) level for access ingress
D) When applied at the port level for network egress

Accepted Answer

The answer of A queue-group template can only contain policers...

Question 19

Which of the following is NOT a factor when deciding if a packet can be accepted into a queue?
A) Profile/priority state of a packet
B) Forwarding class
C) Queue depth
D) HPO setting

Accepted Answer

Queue depth is not a factor when deciding if a packet can be accepted into a queue.

Question 20

Which of the following parameters is taken into account FIRST when a CFHP arbiter allocates bandwidth among its children policers?
A) PIR
B) CIR
C) Level
D) Weight

Accepted Answer

The answer of Which of the following parameters is taken...

Exam 1: Nokia Scalable IP Networks

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

Which action should be taken to ensure that packets do not use the shared buffer space when put into a queue?

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

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

According to the configuration shown above, which of the following about the classification and marking of self-generated BGP traffic is TRUE?

Forwarding sub-classes are configured in the context of which QoS policy type?

What type of unwanted packet drops can the proper configuration of a queue's burst-limit parameter prevent?

Which of the following statements about the token buckets of a policer is TRUE?

Which of the following about scheduling is TRUE?

Which of the following is an example of something that CAN be done with hierarchical policing (CFHP) but CANNOT be done with standalone policers?

Which of the following is NOT a valid configuration value for a queue's CIR parameter within a SAP-ingress policy?

Which priority-mode queue parameter may influence both the profile marking, and scheduling priority of a queue?

Which of the following QoS functions does the slope policy perform?

Which of the following fields in packets belonging to a Layer 3 service can be pre-marked on SAP-ingress?

If two queues complete for bandwidth in a hierarchical scheduler environment, which parameter is used by their parent scheduler to determine the priority with which each queue can use bandwidth above its committed rate?

Which of the following about the process of queuing self-generated traffic in the Nokia 7750 SR is TRUE?

A queue-group template can only contain policers (no queues) when applied under which conditions?

Which of the following is NOT a factor when deciding if a packet can be accepted into a queue?

Which of the following parameters is taken into account FIRST when a CFHP arbiter allocates bandwidth among its children policers?