Nokia Quality of Service Question and Answers

Nokia Quality of Service

Last Update May 9, 2024
Total Questions : 231

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Questions 1

Which of the following is a forwarding class type that is intended for network control traffic on a Nokia 7750 SR?

Options:

High-1

Assured

Best Effort

Expedited

Discussion 0

Questions 2

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?

Options:

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.

Discussion 0

Questions 3

Which of the following self-generated traffic applications is considered “protocol” traffic, as opposed to “management” traffic?

Options:

BGP

Telnet

ICMP

SNMP

Discussion 0

Questions 4

Which of the following statements about behavior aggregate and multi-field classification in a Nokia 7750 SR is TRUE?

Options:

Multi-field classification can use both MAC criteria and IP criteria in the same SAP-ingress QoS policy.

Behavior aggregate classification can use both lsp-exp and dscp in the same SAP-ingress QoS policy.

Multi-field classification cannot use both IP criteria and IPv6 criteria in the same SAP-ingress QoS policy.

Behavior aggregate classification cannot use both dot1p and lsp-exp in the same SAP-ingress QoS policy.

Discussion 0

Questions 5

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

Options:

Profile/priority state of a packet

Forwarding class

Queue depth

HPO setting

Discussion 0

Questions 6

It is necessary for Tier 1 schedulers to obtain bandwidth from a higher tier scheduler.

Options:

TRUE

FALSE

Discussion 0

Questions 7

With hierarchical scheduling, up to ___________ tiers are supported on the Nokia 7750 SR.

Options:

Discussion 0

Questions 8

Which of the following are characteristics of 802.1p? (Choose two)

Options:

802.1p adds 16 bits to the Layer 2 header,

802.1p adds 16 bits to the Layer 3 header.

802.1p specifies 64 different priority levels.

802.1p uses a field in the 802.1Q header.

802.1p uses a field in the Layer 3 IP header

802.1p defines a 3-bit Class of Service field.

Discussion 0

Questions 9

Click the exhibit button below.

Based on the configuration shown below, name the forwarding class to be associated with a TCP packet encapsulated inside an Ethernet frame that arrives on SAP 1/1/5 with the following characteristics:

Destination IP address = 120.110.1.1

TCP port number = 23

DSCP value = nc1

Dot1pvalue = 3

Options:

Discussion 0

Questions 10

Click the exhibit button below.

Based on the configuration of the network policy (below), what will be the forwarding class associated with a MPLS encapsulated customer packet that arrives on a dotlQ encapsulated network port 1/1/4:1 on P1 with the following characteristics:

EXP value = 6

DSCP value = cs1

Dot1pvalue = 3

Options:

Discussion 0

Questions 11

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

Options:

min

max D. 50000

Discussion 0

Questions 12

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?

Options:

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.

Discussion 0

Questions 13

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

Options:

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.

Discussion 0

Questions 14

Which of the following fields can be marked or remarked for frames belonging to a Layer 2 service?

Options:

DSCP

PREC

Dot1p

ToS

Q-in-Q

Discussion 0

Questions 15

Which of the following statements about queue modes, and profile marking of packets when leaving a queue is FALSE?

Options:

Profile-mode and priority-mode queues can only be configured on SAP ingress.

For network egress, egress re-classification can change the profile marked at ingress.

For SAP egress, the profile marked at ingress may change based on the scheduling loop.

For network ingress, the network policy can classify the packet as either in-profile, or out-of-profile.

Discussion 0

Questions 16

Which of the following statements regarding DSCP bits are TRUE? (Choose three)

Options:

The three most significant (first) bits define 8 forwarding classes.

The three least significant (last) bits of the DSCP specify the drop probability.

The full 8 bits of the TOS field are used for DSCP.

To convert DSCP to IP precedence, the three most significant (first) bits are matched.

DSCP provides for eight drop probabilities.

Discussion 0

Questions 17

Which of the following criteria is NOT used in the behavior aggregate classification option?

Options:

dot1p

dst-mac

lsp-exp

dscp

Discussion 0

Questions 18

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

Options:

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.

Discussion 0

Questions 19

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

Options:

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

Discussion 0

Questions 20

On the Nokia 7750 SR, what is the maximum number of ingress queues that a single network queue policy can support in a VPLS?

Options:

Discussion 0

Questions 21

Click the exhibit button below.

At router PE1, customer packets are arriving tagged with a dotlp value of 6 and marked with a DSCP value of EF.

Based on the configuration shown below for a VPLS service, what will be the DSCP and EXP marking for the packet egressing the network port on this PE router? (Choose two)

Options:

The DSCP value will be set to af21.

The DSCP value will be set to af23.

The DSCP value will remain as ef.

The EXP value, in the MPLS headers, will be set to 4.

The EXP value, in the MPLS headers, will be set to 3.

Discussion 0

Questions 22

At which points can traffic be marked or remarked on the Nokia 7750? (Choose two)

Options:

SAP-ingress only

SAP-egress only

SAP-ingress and SAP-egress

Network ingress

Network egress

Discussion 0

Questions 23

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

Options:

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.

Discussion 0

Questions 24

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

Options:

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

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

The default policer 1.

AF traffic is dropped.

Discussion 0

Questions 25

In a Nokia 7750 SR, which of the following is a class type that is intended for non-real-time customer traffic that requires some committed bandwidth?

Options:

Gold

Assured

High Priority

Best Effort

Discussion 0

Questions 26

Which of the following can be used as classifiers of customer traffic? (Choose three)

Options:

DSCP value

802.1p value

IP DF bit

TCP/UDP port numbers

HTML version number

Discussion 0

Questions 27

Which following statements about the four-step QoS process (classification, queuing, scheduling, and marking/remarking) executed for every packet entering a Nokia 7750 SR is TRUE?

Options:

The process happens only before the packet goes through the switching fabric.

The process happens only before the packet goes onto the egress port.

Marking/remarking the packets is for future classification.

Marking/remarking the packets will occur right after classification of the packet.

Discussion 0

Questions 28

A queue is configured with the following attributes:

MBS = 10KB

CBS = 5KB

High-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?

Options:

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.

Discussion 0

Questions 29

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

Options:

Microflow reservations using RSVP

DSCP to EXP translation

Traffic classification

Automatic profiling and policy configuration

Buffer memory management

Traffic scheduling

Discussion 0

Questions 30

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

Options:

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.

Discussion 0

Questions 31

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

Options:

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.

Discussion 0

Questions 32

According to the SAP-ingress QoS policy shown, which of the following statements about processing of the packets by policers 3 and 4 is TRUE?

Options:

Policer 3 forwards packets as out-of-profile when its PIR bucket has 4000 tokens.

Policer 3 starts discarding low-priority packets when its PIR bucket has at least 3000 tokens.

Policer 4 forwards all its packets as out-of-profile.

Policer 4 starts discarding low-priority packets when its PIR bucket has at least 3000 tokens.

Discussion 0

Questions 33

A frame belonging to a Layer 2 service is encapsulated in an MPLS tunnel at a network-egress port. Which of the following fields in the frame can be marked or remarked at the network egress port?

Options:

ToS

DSCP

PREC

EXP

Discussion 0

Questions 34

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

Options:

Ingress traffic is stored in IOM queues and egress traffic is stored in CPM queues.

Ingress traffic is stored in CPM queues and egress traffic is stored in IOM queues.

It is always stored in CPM queues.

It is always stored in IOM queues.

Discussion 0

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