4A0-107 - Alcatel-Lucent Quality of Service
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Which of the following statements BEST describes an MBS parameter?
It specifies the maximum depth of a queue beyond which packets will be dropped.
Which of the following are examples of metrics for QoS?
Delay, jitter, packet loss
Which of the following statements are TRUE when discussing self-generated traffic QoS? (Choose two)
DSCP bits can be set per application, per routing instance.
In order to mark Layer 2 self-generated traffic, 隸etwork interfaces must be set to dot1Q.
Which of the following statements are TRUE regarding the PE device in a QoS enabled network? (Choose two)
A device that classifies and marks customer traffic.
A device that creates macroflows towards the core臨from multiple customer sites.
Which of the following statements regarding policing and shaping on the Alcatel-Lucent 7750 SR are TRUE? (Choose two)
When policing is enabled on the SAP-ingress, all traffic is considered as in-profile.
Setting the CIR and PIRto equal values disables soft-policing.
If a packet is marked on a SAP-ingress, it will be remarked at the first network egress point (if remarking is enabled in the network egress policy).
Which of the following are possible criteria for classifying packets at the network port ingress on the Alcatel-Lucent 7750 SR? (Choose three)
The EXP bits in the MPLS header.
The packet's DSCP bits.
The dot1p bits in the frame header.
Which of the following statements describe the operation of WRED on the Alcatel-Lucent 7750 SR? (Choose three)
WRED uses the shared b念ffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.
The IP ToS field consists of ________ bits, of which ________are used. The _________most significant (first) bits define precedence.
8, 6, 3
Which of the following are possible criteria for classifying packets at the SAP-ingress? (Choose three)
The packet's source and destination IP addresses.
The dot1p bits in the frame header.
The packet's Ethertype.
When deploying an Alcatel-Lucent MPLS network with QoS, how are the EXP bits set?
The first 3 bits of the DSCP value are copied directly into the EXP field on the first network egress.
The EXP bits are set on the first network egress, based on a combination of the SAP-ingress classification and the network policy applied.
Which of the following statements regarding egress FC and profile over-ride are TRUE? (Choose two)
This feature is available on egress SAPs within any service.
If a Behavior Aggregate (BA) and Multi-field (MF) match occurs, the BA classification can override the forwarding class while the MF classification can override the profile.
On the Alcatel-Lucent 7750 SR, what is a slope policy used for?
Definin鈴 the high and low slope values when deploying buffer admission control for TCP traffic in the shared buffer pool.
In which of the following scenarios is the egress port scheduler useful? (Choose two)
A customer is complaining that his VoIP traffic is being dropped even though it is sending the correct DSCP markings. Packets are not being dropped on ingress.
A commercial builder has requested numerous dot1Q epipes, VPRNs, and VPLS services to a business park and is only paying up to a maximum 200Mbps.
What is the 6-bit binary representation of DSCP value AF21?
To manage the shared buffer space at network ports, slope policies are applied on _________ for the ingress direction, and on ________ or _________ for the egress direction.
MDAs, MDAs, ports
How many queues are available for use on service egress within a VPLS service?
8 queues, regardless of traffic type.
Policing improves bandwidth utilization by using buffering to absorb high bursts of traffic.
WRED can be used to help avoid TCP slow-start synch problems.
Which of the following statements BEST describes the IntServ model?
Uses the RSVP protocol to create microflows through a network.
A packet is to be encapsulated inside an MPLS tunnel which consists of two MPLS headers at the first network egress. Which of the MPLS EXP fields will be marked?
The EXP field in both the top and bottom MPLS headers will be marked.
In which of the following scenarios is self-generated traffic QoS (sgt-QoS) useful?
The priority of various control packets requires special treatment throughout the network.
Which of the following statements BEST defines policing?
The process of discarding packets within a traffic stream in accordance with the state of a meter to enforce a defined tr醴ffic profile.
Real-time rate limiting on the service ingress is a feature that performs_____________. Traffic above the defined PIR is ______________.
Which of the following statements regarding buffer pool allocation are FALSE? (Choose two)
All SAP-ingress ports on the same MDA share a buffer pool.
Each netwo捻k ingress port on the same MDA receives its own buffer pool.
On the Alcatel-Lucent 7750 SR, which of the following QoS-related policies can be configured on a SAP? (Choose three)
The SAP-ingress policy
The SAP-egress policy
Traffic assigned to forwarding classes is placed into queues, while the contents of the queues are serviced in a controlled manner using____________.
Which of the following fields can be marked or remarked for frames belonging to a Layer 2 service?
Which of the following are NOT ingress matching criteria for a network policy? (Choose two)
TCP port numbers
Source and destination IP addresses
Which of the following statements is considered best practice when changing a network policy that has been associated with an interface?
A new network policy should be created and applied to the interface, overwriting the previous policy.
Forwarding subclasses are only relevant to, and are therefore applied within the context of, a _____________policy.
Which of the following statements describe the primary objectives of the policing of traffic flows on the Alcatel-Lucent 7750 SR? (Choose two)
Ensure that traffic flows conform to their traffic profile.
Provide fairness between traffic flows, so that conformi隸g (in-profile) traffic flows are not starved of bandwidth and/or buffer space by non-conforming (out-of-profile) flows.
Which of the following statements regarding the egress port scheduler is TRUE?
Multiple HQoS policies can be children of a single port scheduler.
Which of the following BEST describes a SAP when regarding QoS?
A point at which the initial classification of customer traffic occurs.
Which of the following can be used as classifiers of customer traffic? (Choose three)
TCP/UDP port numbers
Which of the following statements regarding DSCP bits are TRUE? (Choose three)
The three most significant (first) bits define 8 forwarding classes.
The three least significant (last) bits of the DSCP specify the drop probability.
To convert DSCP to IP precedence, the three most significant (first) bits臨are matched.
It is necessary for Tier 1 schedulers to obtain bandwidth from a higher tier scheduler.
Which of the following are entities of the Alcatel-Lucent 7750 SR on which you can NOT apply a network-queue policy? (Choose three)
Ingress Ethernet network ports
A queue is configured with the following attributes: MBS = 10KB CBS = 5KB High-Priority-Only = 20% Assume that there is no CBS overbooking and that the slope-policy is disabled. If the current queue depth is 3KB, what will happen to an out-of-profile packet arriving at an egress queue?
It will be queued in the reserved portion of the buffer pool and remain out-of-profile.
If traffic is destined to queue 5, which has a high-priority-only value of 0 in the network-queue policy, all out-of-profile packets will be dropped.
Which of the following are categories of forwarding classes on the Alcatel-Lucent 7750 SR? (Choose two)
Which of the following statements regarding scheduling on the Alcatel-Lucent 7750 SR is TRUE? (Choose two)
When using profile-mode queues, traffic that is marked as in-profile on ingress and scheduled in the above-CIR loop will still be considered as in-profile at egress.
The greater the difference between PIR and CIR rates in a queue, the less likely a CIR will be provided.
In the context of hierarchical scheduling, a scheduler is configured with a CIR weight of 0. Which of the following statements is TRUE?
The scheduler will not be allocated its "within CIR" bandwidth.
Without_______, a customer's high priority traffic can be dropped before its low priority traffic.
prioritization of traffic flows
A physical port has three associated buffer pools. Which of the following buffer pool combinations is associated to a physical port?
Access ingress, access egress, network egress
With hierarchical scheduling, up to ___________ tiers are supported on the Alcatel-Lucent 7750 SR.
Which of the following statements BEST describes where shaping mechanisms should be applied?
At the junction of high-speed to low-speed links or at places of traffic aggregation.
Which of the following statements regarding scheduling are TRUE? (Choose two)
Scheduler policies can be applied to the MDA to schedule network ingress traffic.
Every time a scheduler-policy is as殮igned to a SAP, a new hardware scheduler is created to service the SAP.
On an Alcatel-Lucent IOM 3, how is buffer memory allocated per forwarding complex?
768 MB dynamically allocated between ingress and egress.
Which of the following rate-limiting approaches are used on the Alcatel-Lucent 7750 SR? (Choose two)
Soft shaping at all network interfaces.
Soft shaping at network ingress only.