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ag-CCNP ENCOR 2023 > QoS > Flashcards

QoS Flashcards

1
Q

What type of delay accounts for the time it takes for a router or switch to take a packet from an input interface and place it in the output queue of the output interface?

A

Processing delay

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2
Q

What QoS process is responsible for distinguishing one kind of traffic from another by examining the fields in the packet and determining which traffic is to be treated differently?

A

Classification

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3
Q

What is the relative measure of the number of packets that were not received compared to the total number of packets initially transmitted?

A

Packet loss

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4
Q

What is the time it takes a packet to reach its destination after being transmitted from the sender?

A

Delay

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5
Q

What is the time it takes to put all the bits of a packet onto a link? It is a fixed value that depends on the speed of a link.

A

Serialization delay

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6
Q

What is the time it takes for a packet to travel from a source endpoint to a destination endpoint over a fiber-optic or copper medium?

A

Propagation delay

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7
Q

What is the amount of time it takes for a router or switch to take a packet from an input interface and place the packet into the output queue of the output interface?

A

Processing delay

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8
Q

What is the difference in the end-to-end delay between packets?

A

Jitter

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9
Q

Packet loss can be addressed by using which of the following approaches? (Choose all that apply.)

A. Increasing the speed of the link

B. Implementing QoS congestion-avoidance and congestion-management techniques

C. Implementing traffic policing

D. Avoiding use of traffic shaping

A

A. Increasing the speed of the link

B. Implementing QoS congestion-avoidance and congestion-management techniques

C. Implementing traffic policing

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10
Q

In what QoS model does the application request a specific kind of service from the network (such as bandwidth reservation) before it sends data onto the network?

A

Integrated service (IntServ)

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11
Q

What QoS model can be used by applications to signal their QoS requirements to the router?

A

Resource Reservation Protocol (RSVP)

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12
Q

In what QoS model does the network use QoS specification to classify, mark, shape, and police traffic to perform intelligent queuing?

A

Differentiated service (DiffServ)

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13
Q

What is the process of distinguishing one kind of traffic from another by examining the fields in the packet and determining which traffic is to be treated differently?

A

Classification

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14
Q

What are the layer 2 parameters that can be used for classification?

A

802.1Q class of service (CoS) bits and Multiprotocol Label Switching experimental values (MPLS EXP)

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15
Q

What are the layer 3 parameters that can be used for classification?

A

IP precedence (IPP), differentiated services code point (DSCP), IP explicit congestion notification (ECN), and source/destination IP address

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16
Q

What are the layer 4 parameters that can be used for classification?

A

Layer 4 protocol (TCP/UDP) and source/destination ports

17
Q

What are the layer 7 parameters that can be used for classification?

A

Application signatures via Network Based Application Recognition (NBAR).

18
Q

Marking at layer 2 can be done using what field?

A

802.1Q/p class of service (CoS)

19
Q

Marking at layer 3 can be done using what field?

A

IP type of service (ToS) byte. The first 3 bits of the ToS byte are the IPP bits. These first 3 bits combined with the next 3 bits are known collectively as the DSCP bits.

20
Q

If a session uses more than the allocated bandwidth, traffic can be dropped, which can be configured using what?

A

A Policier

21
Q

What are considered traffic-smoothing tools that work in conjunction with buffering mechanisms?

A

Shapers

22
Q

What does shaping use to ensure packets are not dropped immediately?

A

buffer

23
Q

Which of the following are considered QoS models? (Choose all that apply.)

Best-effort

NBAR

IntServ

DiffServ

A

Best-effort

IntServ

DiffServ

24
Q

True or false: Traffic shaping does not drop traffic, so retransmission is not necessary.

A

True

25
Q

What provides bandwidth guarantees to given classes of traffic and fairness to discrete traffic flows within these traffic classes?

A

Class-based weighted fair queuing (CBWFQ)

26
Q

What provides strict priority servicing and is intended for real-time applications, such as voice traffic?

A

Low-latency queuing (LLQ)

27
Q

What command would you use to define a traffic class?

A

class-map command

28
Q

What command would you use to create a traffic policy?

A

policy-map command

29
Q

What in the QoS config determines how to treat the classified traffic?

A

policy-map

30
Q

What command do use to apply the QoS policy on an interface?

A

service-policy command

31
Q

True or false: Queuing mechanisms on a device are activated only when there is congestion and deactivated when congestion no longer exists.

A

True

32
Q

Which of the following QoS implementation models is most commonly used?

Best-effort

Assured forwarding

IntServ

DiffServ

A

DiffServ

33
Q

Which of the following queuing methods provides strict priority servicing and is intended for real-time applications such as voice traffic?

CBWFQ

LLQ

WRED

DWRED

A

LLQ

34
Q

What type of QoS policy implementation is coded at the CLI and requires each interface to be individually configured? It is time-consuming.

Traditional CLI
Modular QoS at the Command Line (MQC)
Cisco AutoQoS
Cisco SDM QoS Wizard

A

Traditional CLI

35
Q

What type of QoS policy implementation is coded at the CLI and uses configuration modules? It is the best method for QoS fine-tuning.

Traditional CLI
Modular QoS at the Command Line (MQC)
Cisco AutoQoS
Cisco SDM QoS Wizard

A

Modular QoS at the Command Line (MQC)

36
Q

What type of QoS policy implementation applies a possible QoS configuration to the interface? It is the fastest way to implement QoS.

Traditional CLI
Modular QoS at the Command Line (MQC)
Cisco AutoQoS
Cisco SDM QoS Wizard

A

Cisco AutoQoS

37
Q

What type of QoS policy implementation is an application for simple QoS configurations?

Traditional CLI
Modular QoS at the Command Line (MQC)
Cisco AutoQoS
Cisco SDM QoS Wizard

A

Cisco SDM QoS Wizard

38
Q

Refer to the exhibit. Which statement about the last two lines of this policy map configuration is false?

R1(config)# policy-map COPP_policy
R1(config-pmap)# class COPP_class
R1(config-pmap-c)# police 300000 conform-action transmit exceed-action drop
R1(config-pmap-c)# class class-default
R1(config-pmap-c)# police rate 50 pps conform-action transmit exceed-action drop

The class-default class is always automatically placed at the end of every policy map.

It includes an implied match for all packets.

You can reconfigure the match criteria for the class-default class.

Traffic beyond 50 pps will be dropped.

A

You can reconfigure the match criteria for the class-default class.

ag-CCNP ENCOR 2023 (10 decks)

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