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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
UPoE+ (Type 4) is IEEE [...]
802.3bt
26
UPoE (Type 3) is IEEE [...]
802.3bt
27
PoE+ (Type 2) is IEEE [...]
802.3at
28
PoE (Type 1) is IEEE [...]
802.3af
29
What does Cisco ILP stand for?
Cisco Inline Power
30
Power policing: Configure the switch to restart the interface and generate a Syslog message if the PD draws too much power: SW1(config-if)# [...]
power inline police action log
31
Power policing: Configure the switch to disable the interface and generate a Syslog message if the PD draws too much power: SW1(config-if)# [...]
power inline police or power inline police action errdisable
32
PoE: [...] can be configured to prevent a PD from taking too much power.
Power policing
33
Electronic devices use [AC/DC] power.
DC
34
PoE: What does PD stand for?
Powered Device
35
PoE: What does PSE stand for?
Power Sourcing Equipment
36
What does PoE stand for?
Power over Ethernet
37
Configure the voice VLAN: SW1(config-if)# [...]
switchport voice vlan vlan-number
38
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?
Traffic from the IP phone (traffic from the PC will be untagged as usual for an access port)
39
What does VoIP stand for?
Voice over IP
40
What does POTS stand for?
Plain Old Telephone Service
41
What does PSTN stand for?
Public Switched Telephone Network
42
IP phones mark their call signaling traffic as PCP/CoS [...].
3
43
[...] drops traffic in a queue if the traffic rate goes over the configured rate.
Policing
44
[...] buffers traffic in a queue if the traffic rate goes over the configured rate.
Shaping
45
LLQ designates one or more queues as [...] queues.
strict priority
46
What does LLQ stand for?
Low Latency Queuing
47
What QoS scheduling algorithm uses a weighted round-robin scheduler while guaranteeing a minimum bandwidth to each queue?
CBWFQ
48
What does CBWFQ stand for?
Class-Based Weighted Fair Queuing
49
If an IP phone is connected to a switchport, the QoS trust boundary should be at the [...].
IP phone
50
RFC 4594 recommends the [...] marking for best effort traffic.
DF
51
RFC 4594 recommends the [...] marking for high priority data traffic.
AF2x (AF21, AF22, AF23)
52
RFC 4594 recommends the [...] marking for streaming video traffic.
AF3x (AF31, AF32, AF33)
53
RFC 4594 recommends the [...] marking for interactive video traffic.
AF4x (AF41, AF42, AF43)
54
RFC 4594 recommends the [...] marking for voice traffic.
EF
55
CS7 = DSCP [...]
56
56
CS6 = DSCP [...]
48
57
CS5 = DSCP [...]
40
58
CS4 = DSCP [...]
32
59
CS3 = DSCP [...]
24
60
CS2 = DSCP [...]
16
61
CS1 = DSCP [...]
8
62
CS0 = DSCP [...]
0
63
AF13 = DSCP [...]
14
64
AF12 = DSCP [...]
12
65
AF11 = DSCP [...]
10
66
AF23 = DSCP [...]
22
67
AF22 = DSCP [...]
20
68
AF21 = DSCP [...]
18
69
AF33 = DSCP [...]
30
70
AF32 = DSCP [...]
28
71
AF31 = DSCP [...]
26
72
AF43 = DSCP [...]
38
73
AF42 = DSCP [...]
36
74
AF41 = DSCP [...]
34
75
EF = DSCP [...]
46
76
[...] = DSCP 46
EF
77
DF = DSCP [...]
0
78
[...] = DSCP 0
DF
79
DSCP: What does CS stand for?
class selector
80
DSCP: What does AF stand for?
assured forwarding
81
DSCP: What does EF stand for?
expedited forwarding
82
DSCP: What does DF stand for?
default forwarding
83
The IPP precedence field was [...] in length.
3 bits
84
CoS/PCP 5 = [...]
voice traffic
85
CoS/PCP [...] = voice traffic
5
86
CoS/PCP 4 = [...]
video traffic
87
CoS/PCP [...] = video traffic
4
88
CoS/PCP 3 = [...]
critical applications
89
CoS/PCP [...] = critical applications
3
90
CoS/PCP 0 = [...]
best effort
91
CoS/PCP [...] = best effort
0
92
[...] delivery means there is no guarantee that data is delivered or that it meets any QoS standard.
Best effort
93
What does IPP stand for?
IP Precedence
94
What Layer 3 header field can be used for QoS markings?
DSCP (formerly IPP)
95
What Layer 2 header field can be used for QoS markings?
PCP / CoS
96
What does NBAR stand for?
Network Based Application Recognition

CCNA (37 decks)

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