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ADV NWT > Quality of Service > Flashcards

Quality of Service Flashcards

1
Q

Allows the network administrator to prioritize certain types of traffic over others

A

Quality of Service

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2
Q

What type of traffic and voice traffic require greater resources, such as bandwidth, from the network than other types of traffic?

A

Video and Voice traffic

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3
Q

What transactions is time sensitive and have greater needs than as FTP transfer or web traffic(HTTP)

A

Financial traffics

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4
Q

What are the 3 types of priority queues ?

A

High priority queue
Medium priority queue
Low priority queue

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5
Q

When should a device implement QoS?

A

During congestion

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6
Q

Examples of congestion points

A

aggregation, speed mismatch, LANs to WAN

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7
Q

Without QoS mechanisms, What happens when a router receives a digital audio stream for VoIP ?

A

Compensation for the jitter that is encountered

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8
Q

Features of traffic

  • Less resources used
  • Fairly steady and not very large
  • Requires at least 20 kbps of bandwidth with no more than 1% packet loss
A

Voice packets

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9
Q

Features of Traffic

  • More demanding
  • Bursty and greedy
  • Consume lots of resources
  • Requires at least 384 kbps in bandwidth , 0.1 < 1 % packet loss
A

Video Traffic

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10
Q

One way requirement for voice traffic - latency, jitter, loss

A

150 ms, 30 ms, 1%

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11
Q

Disadvantages of voice traffic

A

very sensitive to delay and dropped packets

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12
Q

One way requirements for video traffic - latency, jitter, loss, bandwidth

A

L - <=200 - 400 ms
J - <= 30 – 50ms
L - <= 0.1 – 1%
BW - (384 Kb/s – 20+ Mb/s)

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13
Q

What traffic that uses TCP to performs error recovery

A

Data traffic

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14
Q

Factors to consider for data delay

A

Does the data come from an interactive application?

Is the data mission critical?

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15
Q

4 types of algorithm types for queueing

A

FIFO
Weighted Fair Queuing (WFQ)
Class-based WFQ (CBWFQ)
Low latency Queuing ( LLQ)

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16
Q

An algorithm that involves buffering and forwarding of packets in the order of arrival

A

FIFO

17
Q

An algorithm that uses automated scheduling method that provides fair bandwidth allocation to all network traffic

A

Weighted Fair Queuing (WFQ)

18
Q

An algorithm that extends the standard WFQ functionality to provide support for user-defined traffic classses

A

Class-based WFQ

19
Q

An algorithm that uses strict priority queuing to CBWFQ which reduces jitter in vice conversations

A

LLQ

20
Q

Advantages of LLQ

A

Delay-sensitive data (voice) is sent first

21
Q

What are the 3 model types of implementing QoS ?

A 
Best-effort
Integrated Services (IntServ)
Differentiated Services (DiffServ)
22
Q

QoS model that is less resource intensive and more scalable

A

DiffServ

23
Q

QoS model that provides the highest guarantee of QoS, but is resource-intensive

A

IntServ

24
Q

QoS model that treats all network packets the same way

A

Best-effort

25
Q

Benefits of Best-effort

A

Easiest and quickest model to deploy

Most scalable

26
Q

QoS model that uses resource reservation and an admission-control mechanism as building blocks to establish and maintain QoS

A

IntServ

27
Q 
QoS model that enforces and applies QoS mechanisms on 
a hop-by-hop basis uniformly applying global meaning to each traffic class to provide both flexibility and scalability
A

DIffServ

28
Q

QoS model that divides network traffic into classes based on business requirements.

A

DiffServ

29
Q

3 Main categories from QoS implementation tools

A

Classification and marking tools
Congestion avoidance tools
Congestion management tools

30
Q

Ways to avoid packet loss

A

increase link capacity
Guarantee enough bandwidth
Drop lower-priority packets before congestion occurs

31
Q

A tool that monitors network traffic loads in an effort to anticipate and avoid congestion at common network bottlenecks before congestion becomes a problem

A

Congestion Avoidance

32
Q

What happens when an edge router using IntServ QoS determines that the data pathway cannot support the level of QoS requested?

A

Data is not forwarded along the pathway

33
Q

How many levels of priority are possible when using class of service (CoS) marking on frames?

A

8 (0-7)

34
Q

What is the default queuing method used on the LAN interfaces of Cisco devices?

A

FIFO

35
Q

Which QoS technology provides congestion avoidance by allowing TCP traffic to be throttled before buffers become full and tail drops occur?

A

weighted random early detection

36
Q

Which QoS technique retains excess packets in a separate queue for later transmission?

A

shaping

ADV NWT (12 decks)

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