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Cisco CCNA 2 > 18 - QOS > Flashcards

18 - QOS Flashcards

1
Q

QOS Tools give you a means to manage what 4 characteristics ?

A
  • Bandwidth
  • Delay
  • Jitter
  • Loss
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2
Q

What is bandwidth as it relates to QOS?

A

Capacity of the link.

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3
Q

What is delay?

A
  • 2 types of delay
    • One-way Delay - the time between sending a packet and that same packet arriving at the destination host.
    • Round-trip Delay - the time it takes to send a packet and receive one back
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4
Q

What is jitter?

A

A variation in one-way delay between consecutive packets sent by the same application.

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5
Q

What is loss?

A

The amount of lost packets usually as a percentage of the total packets sent.

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6
Q

What are the guidelines for Interactive Voice?

A
  • Delay - 150 ms or less
  • Jitter - 30 ms or less
  • Loss - 1% or less
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7
Q

What are the guidelines for Video?

A
  • Bandwidth - 384 kbps to 20+ Mbps
  • Delay - 200 to 400 ms
  • Jitter - 30 to 50 ms
  • Loss - .1% to 1%
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8
Q

What is Classification and Marking?

A

Marking of packets and the definition of trust boundaries

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9
Q

What is another name for Congestion Management?

A

Queuing

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10
Q

What is Congestion Management?

A

The scheduling of packets to give one type of packet priority over another.

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11
Q

What is Congestion Avoidance?

A

Addresses how to manage the packet loss that occurs when network devices get too busy.

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12
Q

What is NBAR?

A

Network Based Application Recognition

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13
Q

What do IP Phones mark voice payload packets with?

A

EF

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14
Q

What do Cisco IP Phones mark call setup packets with?

A

CS3

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15
Q

In an X-Y chart which is on the horizontal axis?

A

X which is the Best Drop to Worst Drop priority

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16
Q

In an X-Y chart which is on the vertical axis?

A

Y which are the 4 separate queues with Best queue at the top and Worst queue at the bottom.

17
Q

What was the TOS byte originally?

A

3 bit IP Precedence field

18
Q

What is the TOS byte now?

A

Class Selector DSCP values

19
Q

What are the names of the Class Selector values?

A

CS0 through CS7

20
Q

What is Prioritization?

A

The process of giving one queue priority over another in some way.

21
Q

What is Class Based Weighted Fair Queuing (CBWFQ)?

A

Uses a round robin scheduler letting the network engineer define the weightings as a percentage of bandwidth.

22
Q

What is Low Latency Queuing?

A
  • LLQ tells scheduler to treat one or more queues as Priority Queues.
  • Priority Queues are always ‘next’.
  • Policer is used to prevent queue starvation.
  • Call Admission Control limits the number of calls the network will handle.
23
Q

What is the Trust Boundary?

A

The point in the network where devices can trust the current QOS markings

24
Q

Where is the Trust Boundary on a VOIP network?

A

The phone

25
Q

What is the DSCP Value (text name and decimal value) suggested by the DIffServ RFC for Voice payloads?

A

Suggested DSCP text name and decimal value for Voice Payloads is EF 46

26
Q

What DSCP Value does the DiffServ RFC recommend that Call Signaling packets be marked as?

A

CS3

27
Q

What are the 3 sets of DSCP values used in DiffServ?

A
  • Expedited Forwarding
  • Assured Forwarding
  • Class Selector
28
Q

What is Assured Forwarding?

A
  • Defines
    • 12 DSPC AF values used in concert with each other
    • Made up of 4 queues
      • with 3 levels of drop priority for each queue.
29
Q

In DiffServ Class Selector what are the decimal values?

A

Multiples of 8 starting with CSO = 0 up to CS7 = 56

CS1 = 8

CS2 = 16

CS3 = 24

CS4 = 32

CS5 = 40

CS6 = 48

CS7 = 56

30
Q

What are the 5 names of Marking Fields?

A
  • DSCP
  • IPP
  • CoS
  • TID
  • EXP
31
Q

What are the 3 Sets of DSCP Values used in DiffServ architecture?

A
  1. Express Forwarding (EF) - One DSCP value
  2. Assured Forwarding (AF) - 12 DSCP Values
  3. Class Selector (CS) - 8 DSCP Values

Cisco CCNA 2 (40 decks)

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