CICD - Questions Flashcards
What is the Policing and shaping QoS mechanism?
Enforces a rate limit based on the metering
What is the Link Efficiency QoS mechanism?
Used to improve bandwidth
What is the Classification QoS mechanism ?
Uses existing and trusted DSCP values
What is the Marking QoS mechanism ?
Based on classification, metering, or both
What is the Congestion Management QoS mechanism?
Requires all interfaces to have a queuing mechanism
What describes the FIFO algorithm?
Uses one queue only
What describes the Priority Queuing algorithm ?
Assigns each packet a priority
What describes the Weighted Fair Queuing (WFQ) algorithm?
Schedules classified interactive traffic to the front of a queue
What describes the Class-Based Weighted Fair Queuing (CBWFQ) algorithm?
Supports user-defined traffic classes
What describes the Low-Latency Queuing (PQ-CB-WFQ) algorithm ?
Uses a priority queue for voice traffic at a guaranteed rate
What QoS characteristics correspond to the Best-effort QoS model ?
The default QoS model for all router models when no QoS is deployed
What QoS characteristics correspond to the INTSERV QoS model ?
A multiple-service model that can accomodate multiple QoS requirements
Applications reserve bandwidth for a specific time
What QoS characteristics correspond to the DIFFSERV QoS model ?
Provides an “almost guaranteed” QoS
Also known as “soft QoS”
Identify the characteristics of using LFI in your network.
Reduces queuing delay and jitter by expediting the transfer of smaller frames through the Tx queue
LFI methods include MLP and FRF.12 and FRF.11 Annex C
Voice quality is directly affected by three QoS factors. What describes the JITTER quality factor ?
Late or out-of-order packets end up being discarded. Playout buffers are used to balance the delay and the probability of interrupted playout due to late packets
Voice quality is directly affected by three QoS factors. What describes the LOSS quality factor ?
Causes voice clipping and skips and is corrected with the industry-standard CODEC used in Cisco digital processors (DSPs)
Voice quality is directly affected by three QoS factors. What describes the LATENCY/DELAY quality factor ?
Can cause voice quality degradation and should be held to 150 ms for one-way, end-to-end transmission
RTP header compression can benefit both telephony voice and multicast backbone applications. In what situation is using RTP header compression not recommended ?
On high-speed interfaces
Identify the QoS considerations within a converged network.
Packets cannot tolerate more than a 150-ms delay
Videoconferencing streams would require the actual bandwidth of the stream plus an additional 20%
Identify the issues facing converged enterprise networks.
Scarce bandwidth
Delay issues
Jitter
Packet loss
Which of the following are characteristic descriptions for multisite Cisco Unity Connection deployment?
Uses the G.729 codec
Requires traffic pattern evaluations
Makes use of transcoding
What are the functions of the FXS analog voice port ?
Connect router to end-user equipment
Provides ring, power and dial tones
What are the functions of the FXO analog interface ?
Connect a trunk to a PSTN or to a PBX
Makes and receives calls from the PSTN
Identify features of voicemail user CoS
Timers are used to define recording times
Licensed and cost-generating features are disabled by default
Call Transfer for outgoing or transferred calls can be restricted