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CCNA > QoS > Flashcards

QoS Flashcards

1
Q

QoS: What features drop random packets when traffic queues pass a certain threshold?

A

RED / WRED

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2
Q

QoS: What does WRED stand for?

A

Weighted Random Early Detection

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3
Q

QoS: What does RED stand for?

A

Random Early Detection

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4
Q

Tail drop is harmful because it can lead to […].

A

TCP global synchronization

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5
Q

When packets are dropped due to a full queue, it is called […].

A

tail drop

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6
Q

What does FIFO stand for?

A

First In First Out

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7
Q

QoS: By default, queued messages will be forward in a […] manner.

A

FIFO

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8
Q

What is considered acceptable loss for interactive audio traffic?

A

1% or less

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9
Q

What is considered acceptable jitter for interactive audio traffic?

A

30 ms or less

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10
Q

What is considered acceptable one-way delay for interactive audio traffic?

A

150 ms or less

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11
Q

QoS: […] is the percentage of packets that do not reach their destination.

A

Loss

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12
Q

QoS: […] is the variation in one-way delay between packets sent by the same application.

A

Jitter

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13
Q

QoS: […] is the amount of time it takes traffic to go from source to destination.

A

Delay (=one-way delay)
(Two-way delay measures both ways)

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14
Q

QoS: […] refers to the overall capacity of a link.

A

Bandwidth

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15
Q

UPoE+ (Type 4) uses […] powered wire pairs.

A

4

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16
Q

UPoE (Type 3) uses […] powered wire pairs.

A

4

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17
Q

PoE+ (Type 2) uses […] powered wire pairs.

A

2

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18
Q

PoE (Type 1) uses […] powered wire pairs.

A

2

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19
Q

Cisco ILP uses […] powered wire pairs.

A

2

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20
Q

Cisco ILP offers […] watts of power.

A

7

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21
Q

UPoE+ (Type 4) offers […] watts of power.

A

100

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22
Q

UPoE (Type 3) offers […] watts of power.

A

60

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23
Q

PoE+ (Type 2) offers […] watts of power.

A

30

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24
Q

PoE (Type 1) offers […] watts of power.

A

15

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25
Q

UPoE+ (Type 4) is IEEE […]

A

802.3bt

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26
Q

UPoE (Type 3) is IEEE […]

A

802.3bt

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27
Q

PoE+ (Type 2) is IEEE […]

A

802.3at

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28
Q

PoE (Type 1) is IEEE […]

A

802.3af

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29
Q

What does Cisco ILP stand for?

A

Cisco Inline Power

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30
Q

Power policing: Configure the switch to restart the interface and generate a Syslog message if the PD draws too much power:
SW1(config-if)# […]

A

power inline police action log

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31
Q

Power policing: Configure the switch to disable the interface and generate a Syslog message if the PD draws too much power:
SW1(config-if)# […]

A

power inline police
or
power inline police action errdisable

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32
Q

PoE: […] can be configured to prevent a PD from taking too much power.

A

Power policing

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33
Q

Electronic devices use [AC/DC] power.

A

DC

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34
Q

PoE: What does PD stand for?

A

Powered Device

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35
Q

PoE: What does PSE stand for?

A

Power Sourcing Equipment

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36
Q

What does PoE stand for?

A

Power over Ethernet

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37
Q

Configure the voice VLAN:
SW1(config-if)# […]

A

switchport voice vlan vlan-number

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38
Q

When the switchport voice vlan command is applied to an interface, which traffic will be tagged? Traffic from the PC or from the IP phone?

A

Traffic from the IP phone
(traffic from the PC will be untagged as usual for an access port)

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39
Q

What does VoIP stand for?

A

Voice over IP

40
Q

What does POTS stand for?

A

Plain Old Telephone Service

41
Q

What does PSTN stand for?

A

Public Switched Telephone Network

42
Q

IP phones mark their call signaling traffic as PCP/CoS […].

A

3

43
Q

[…] drops traffic in a queue if the traffic rate goes over the configured rate.

A

Policing

44
Q

[…] buffers traffic in a queue if the traffic rate goes over the configured rate.

A

Shaping

45
Q

LLQ designates one or more queues as […] queues.

A

strict priority

46
Q

What does LLQ stand for?

A

Low Latency Queuing

47
Q

What QoS scheduling algorithm uses a weighted round-robin scheduler while guaranteeing a minimum bandwidth to each queue?

A

CBWFQ

48
Q

What does CBWFQ stand for?

A

Class-Based Weighted Fair Queuing

49
Q

If an IP phone is connected to a switchport, the QoS trust boundary should be at the […].

A

IP phone

50
Q

RFC 4594 recommends the […] marking for best effort traffic.

A

DF

51
Q

RFC 4594 recommends the […] marking for high priority data traffic.

A

AF2x (AF21, AF22, AF23)

52
Q

RFC 4594 recommends the […] marking for streaming video traffic.

A

AF3x (AF31, AF32, AF33)

53
Q

RFC 4594 recommends the […] marking for interactive video traffic.

A

AF4x (AF41, AF42, AF43)

54
Q

RFC 4594 recommends the […] marking for voice traffic.

A

EF

55
Q

CS7 = DSCP […]

A

56

56
Q

CS6 = DSCP […]

A

48

57
Q

CS5 = DSCP […]

A

40

58
Q

CS4 = DSCP […]

A

32

59
Q

CS3 = DSCP […]

A

24

60
Q

CS2 = DSCP […]

A

16

61
Q

CS1 = DSCP […]

A

8

62
Q

CS0 = DSCP […]

A

0

63
Q

AF13 = DSCP […]

A

14

64
Q

AF12 = DSCP […]

A

12

65
Q

AF11 = DSCP […]

A

10

66
Q

AF23 = DSCP […]

A

22

67
Q

AF22 = DSCP […]

A

20

68
Q

AF21 = DSCP […]

A

18

69
Q

AF33 = DSCP […]

A

30

70
Q

AF32 = DSCP […]

A

28

71
Q

AF31 = DSCP […]

A

26

72
Q

AF43 = DSCP […]

A

38

73
Q

AF42 = DSCP […]

A

36

74
Q

AF41 = DSCP […]

A

34

75
Q

EF = DSCP […]

A

46

76
Q

[…] = DSCP 46

A

EF

77
Q

DF = DSCP […]

A

0

78
Q

[…] = DSCP 0

A

DF

79
Q

DSCP: What does CS stand for?

A

class selector

80
Q

DSCP: What does AF stand for?

A

assured forwarding

81
Q

DSCP: What does EF stand for?

A

expedited forwarding

82
Q

DSCP: What does DF stand for?

A

default forwarding

83
Q

The IPP precedence field was […] in length.

A

3 bits

84
Q

CoS/PCP 5 = […]

A

voice traffic

85
Q

CoS/PCP […] = voice traffic

A

5

86
Q

CoS/PCP 4 = […]

A

video traffic

87
Q

CoS/PCP […] = video traffic

A

4

88
Q

CoS/PCP 3 = […]

A

critical applications

89
Q

CoS/PCP […] = critical applications

A

3

90
Q

CoS/PCP 0 = […]

A

best effort

91
Q

CoS/PCP […] = best effort

A

0

92
Q

[…] delivery means there is no guarantee that data is delivered or that it meets any QoS standard.

A

Best effort

93
Q

What does IPP stand for?

A

IP Precedence

94
Q

What Layer 3 header field can be used for QoS markings?

A

DSCP
(formerly IPP)

95
Q

What Layer 2 header field can be used for QoS markings?

A

PCP / CoS

96
Q

What does NBAR stand for?

A

Network Based Application Recognition

CCNA (37 decks)

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