Qos Quiz

18 Questions | Total Attempts: 1180

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Qos Quiz

By IMS Asia (https://www. Imsasia. Com)


Questions and Answers
  • 1. 
    Quality of Service can alleviate which problems?
    • A. 

      Insufficient Bandwidth

    • B. 

      Link Instability

    • C. 

      Dropped voice calls during periods of high network utilisation

    • D. 

      Interface buffer overruns

  • 2. 
    Scheduler policies are applied to which interfaces?
    • A. 

      Ingress Interfaces Only

    • B. 

      Ingress and Egress Interfaces

    • C. 

      Loopback Interfaces

    • D. 

      Egress interfaces Only

  • 3. 
    Which of the following are defined forwarding classes? (choose two)
    • A. 

      Best Effort

    • B. 

      Assured Routing

    • C. 

      Expedited Forwarding

    • D. 

      Network Access

  • 4. 
    How many bits are used for QOS in the MPLS Header?
    • A. 

      1

    • B. 

      3

    • C. 

      8

    • D. 

      32

  • 5. 
    QOS is useful only if VOIP is used in the network.
    • A. 

      True

    • B. 

      False

  • 6. 
    Which of the following terms is used to describe the time it takes to actually transmit a packet on a link?
    • A. 

      Encoding delay

    • B. 

      Processing delay

    • C. 

      Serialization delay

    • D. 

      Transmission delay

  • 7. 
    Which of the following are correct statements regarding DSCP?
    • A. 

      The three least significant bits specify the drop probability.

    • B. 

      The 8 TOS bits are used for DSCP.

    • C. 

      To convert DSCP to IP Precedence, the three highest bits are matched.

    • D. 

      DSCP provides for up to 8 precedence levels, with two drop probabilities.

  • 8. 
    Which of the following could you match on as part of a multifield classifier?
    • A. 

      Source and Destination Address

    • B. 

      Source or Destination Port

    • C. 

      Advertising Router

    • D. 

      IP TTL

  • 9. 
    The QoS requirements on the CE and PE router differ depending on which factor?
    • A. 

      Whether or not the PE router is managed by the service provider

    • B. 

      Whether or not the CE router is managed by the service provider

    • C. 

      Whether or not the service provider is using an MPLS core

    • D. 

      The SLAs offered by the service provider

  • 10. 
    What mathematical model is used by traffic policing mechanisms to meter traffic?
    • A. 

      Token bucket

    • B. 

      RED

    • C. 

      FIFO metering

    • D. 

      Predictor or stacker

  • 11. 
    What is the main advantag of using multiaction policing?
    • A. 

      To distinguish between exceeding and violating traffic

    • B. 

      To distinguish between conforming and exceeding traffic

    • C. 

      To allow the setting of both Layer 2 and Layer 3 QOS markers at the same time

    • D. 

      To allow marking of the traffic before transmission

  • 12. 
    Which two statements about FRF.12 and FRF.11 Annex C are correct?
    • A. 

      FRF.12 fragmentation is used on DLCIs configured for VoIP

    • B. 

      FRF.12 fragmentation is used on DLCIs configured for VoFR

    • C. 

      FRF.11 Annex C fragmentation is used on DLCIs configured for VoIP

    • D. 

      FRF.11 Annex C fragmentation is used on DLCIs configured for VoFR

  • 13. 
    Which of the following is NOT used for Quality of Service?
    • A. 

      DSCP bits.

    • B. 

      MPLS EXP bits.

    • C. 

      802.1X

    • D. 

      802.1P

  • 14. 
    Which of the following are examples of metrics for QOS?
    • A. 

      Jitter, Delay, Packet-loss.

    • B. 

      Latency, WRED, Attenuation.

    • C. 

      AIS, Latency, NEXT.

    • D. 

      SNR, Delay, WRED.

  • 15. 
    Which of the following QOS functions are performed on the incoming interface?
    • A. 

      Packet Scheduling

    • B. 

      Congestion Management

    • C. 

      Packet Classification

    • D. 

      Buffer Management

  • 16. 
    ICMP Echo-Request and Echo-Reply packets are treated as Network Control traffic?
    • A. 

      True

    • B. 

      False

  • 17. 
    Which transport layer protocol is used for voice traffic?
    • A. 

      UDP

    • B. 

      TCP

    • C. 

      XNS

    • D. 

      HTTP

  • 18. 
    Which three are QoS requirements for voice?
    • A. 

      Latency less that 150 ms

    • B. 

      Jitter less than 30 ms

    • C. 

      Loss less than 1 percent

    • D. 

      Bandwidth 80kbps per call minimum for all codecs

    • E. 

      Retransmit interval less than 10 ms

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