Free 4A0-107 – Alcatel-Lucent Quality of Service Practice Test Question

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  The first 3 bits of the DSCP value are copied directly into the EXP field on the first network egress.

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  The EXP bits are set on the first network egress, based on a combination of the SAP-ingress classification and the network policy applied.

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  The 3 priority bits are copied directly from the dot1p header into the EXP field of the first MPLS header.

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  The EXP bits are set based on a default map that translates DSCP codes into internal forwarding classes on SAP-ingress.
  
  

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  In order to mark Layer 2 traffic, sgt-qos will set various ToS bits.

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  DSCP bits can be set per application, per routing instance.

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  The DSCP marking stays nc1 for all applications. Only the internal FC is manipulated across different applications.

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  In order to mark Layer 2 self-generated traffic, network interfaces must be set to dot1Q.

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  The internal forwarding class for self-generated traffic is set once and applied to the base router and all VPRN instances.
  
  

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  All out-of-profile traffic will be dropped before any in-profile is dropped.

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  The time average factor of 0 will discard all packets arriving in the shared buffer pool.

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  When the shared buffer utilization reaches 51%, in-profile packets might be dropped.

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  The highest probability with which an out-of-profile packet can be dropped is 20%.

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  When an in-profile packet arrives and the shared buffer utilization is at 69%, the packet will have approximately a 60% likelihood of being discarded.
  
  

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• ○

  Network ingress port

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  Epipe ingress SAP

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  ES egress SAP

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  Ingress MDA

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  VPRN ingress interface

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  Shared buffer space
  
  

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• ○

  Ensure that traffic flows conform to their traffic profile.

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  Log violations of metered traffic flows exceeding the CIR value set on the entity across which the traffic is moving.

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  Provide fairness between traffic flows, so that conforming (in-profile) traffic flows are not starved of bandwidth and/or buffer space by non-conforming (out-of-profile) flows.

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  Minimize packet loss and reduce end to end latency.
  

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  Ensure that variable latencies do not cluster short bursts of originally conforming packets and render them nonconforming.
  
  

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• ○

  It is a parent scheduler.

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  It is the top-level scheduler.

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  It can allocate up to 50 Mbps of bandwidth to scheduler "low" since the bandwidth is not used by another Tier 3 scheduler.

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  It is a child scheduler.
  

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  It can only have queues as children.
  
  

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  A device that provides no differentiation between customer traffic flows.

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  A device that classifies and marks customer traffic.

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  A device that uses MPLS EXP bits to differentiate between traffic flows.

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  A device that creates macroflows towards the core from multiple customer sites.

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  A device that passes macroflows while optionally changing QoS markings.
  
  

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• ○

  EF

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  H1

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  L1

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  H2

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  L2
  
  

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• ○

  TRUE

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  FALSE
  
  

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  PIR = 5 Mbps, CIR = 0 Mbps

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  PIR= 4 Mbps, CIR = 1 Mbps

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  PIR= 6 Mbps, CIR = 4 Mbps
  

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  PIR= 6 Mbps, CIR = 1 Mbps
  
  

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• ○

  3

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  4

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  6
  

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  8
  
  

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  The default scheduler spends an equal amount of time servicing each queue that has traffic to be sent out.

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  Queue-type can be configured as best-effort, expedite, or auto-expedite.

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  A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it.

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  A queue configured as auto-expedited will be an expedited queue as long as no Best Effort FC is mapped to it.
  
  

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  Real-time

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  Assured

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  Best-effort

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  Self-generated
  
  

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  Packets that arrive in a burst are immediately dropped; packets that arrive with the proper in between space are immediately.

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  Packets are buffered on arrival and are forwarded at an average rate conforming with PIR, typically, with a reduced burstiness.

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  Packets with an average arrival rate higher than PIR are immediately dropped; conforming packets are forwarded at the same rate at which they arrive.

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  Packets with an average arrival rate higher than PIR are buffered for future processing; conforming packets are immediately forwarded.
  
  

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• ○

  Limiting the maximum forwarding rate of each individual policer and, at the same time, marking, packets as in-profile or out-of-profile.

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  Putting packets in a buffer as they are received, and marking packets as in-profile or out-ofprofile as they are removed from the buffer.

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  Rate-limiting the collective output of several policers, and to reallocate bandwidth that is not utilized by some policers to other policers that need to use it.

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  Rate-limiting the collective output of several policers towards each egress FFPC, while maintaining control of the maximum overall forwarding rate.