Test your basic knowledge |

CCNA Voice - 3

Subjects : cisco, it-skills, ccna
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. RTP consists of a __ __ and a control part the called __






2. __ is a __test given to listeners. The listeners give each sample of speech material a rating of __ (bad) to __ (excellent)






3. What are 3 things you can do if they want to implement a corporate dial plan






4. PSQM was developed to 'hear' impairments caused by __ and __ and not packet loss or jitter






5. Simplify the router - use H.323 gatekeeper or voice managers to avoid __ __






6. RTP uses the __ __ to determine whether the packets are arriving in order - and it uses the __ __ information to determine the interarrival packet time (jitter).






7. __ Kbps low-delay variation of CELP voice compression 16 kbps






8. Preferred codec for skype - PC to phone apps - A free speech codec suitable for robust voice communication over IP.






9. Time of day of highest calls on circuit focus those on the __






10. Caused by the length a signal must travel via light in fiber or electrical impulse in copper-based networks.






11. __ Describes a compression technique that you can use to compress ___or other __ signal components of multimedia service at a low bit rate - MP-MLQ provides greater quality at __ Kbps - CELP provides flexibility at __Kbps






12. __ __ conceals interarrival packet delay variation.






13. You hear your own voice in the background ( 4wire)






14. __ describes __ coding at __ - __ - __ and __ Kbps; you also can interchange ADPCM voice between packet voice and public phone or PBX networks






15. __ recommends no more than __ms delay one-way transmission






16. PCM and ADPCM are examples of __ __






17. Proxy server is not required in an __ based system






18. Voice samples are packed into the___ ___ of a UDP/RTP packet and thus the network header overhead would be __.






19. The jitter buffer found within Cisco IOS ___ is considered a __ queue. This queue can grow or shrink exponentially depending on the interarrival time of the __ packets.






20. VAD detects a drop-off of speech ___ - it waits a fixed amount of time before it stops putting speech frames in packets. This fixed amount of time is known as __ ( when the person stops talking)






21. __is characterized as the amount of time it takes for speech to exit the speaker's mouth and reach the listener's ear.






22. Is the amount of time it takes to actually place a bit or byte onto an interface. Its influence on delay is relatively minimal.






23. Customers that have almost unlimited bandwidth - however - consider __ a worthwhile mechanism to enhance reliability and voice quality - mechanism makes it more probable that one of the packets will make the journey from sender to receiver






24. __ protocol that carries audio and video packets - is the standard for transmitting__ __traffic across packet-based networks






25. Defines many different causes of delay (actual packetization - compression - and packet switching) and is caused by devices that forward the frame through the network. Includes __ ___ for congested networks.






26. These techniques can be grouped together generally as __ __ and include variations such as linear predictive coding (LPC) - code excited linear prediction compression (CELP) - and multipulse - multilevel quantization (MP-MLQ).






27. Bob@nextdoorneighbor.com is a __ entry but coverts then to an __ address






28. ___ ___ are used within Cisco IOS Software to determine what level of ___ - if any - exists within the network.






29. How do you fix queuing delay - you would add






30. If a packet is lost What is replayed? packet loss is common in data networks but not in __






31. It has a large header of __ bytes - Size of headers IP/RTP/UDP






32. Using G.729 - just __ conversions from D/A cause the MOS score to decrease rapidly but __ is less resilient






33. The problem with VAD is detecting when speech __. This is known as__ Usually - the person listening to the speech does not notice this cut off because it did not record and transmit any codec.






34. You stop Echo in a PSTN by __ __ and is done in __ which is located on each __






35. __ is not wasting __ when there is no sound to transmit. At least __ % is wasted






36. __ __ occurs when you have more than one compression/decompression cycle for each phone call and Voice degradation occurs






37. When companies merge make sure you configure the __ __






38. A __ can trick the human ear into perceiving a higher-quality voice - but a __ cannot be tricked.






39. Echo cancellers are limited by the total amount of time they wait for the reflected speech to be received __ __. A good time to configure is __ms






40. Satellite transmission takes approximately __ ms for a transmission to reach the satellite and another __ ms for it to come back down to Earth. This results in a total delay of __ ms.






41. VAD problems in determining when speech __ and __ - and in distinguishing speech from __ __. Its also known as __ __ __ __






42. On a voip link What is the max packet loss






43. How does G.729 header go __/__/__






44. Who scored highest in the MOS






45. __ is an _ measurement of voice quality and the __ measures the voice






46. This adaptation of jitter buffer __ is effective in compensating for delays.






47. The data part of RTP is a thin protocol that provides support for applications with real-time properties - such as __ __ (for example - audio and video) - including __ __ - loss detection - and content identification.






48. Another compression method used often is ____ . A commonly used instance of this is ITU-T __ - which encodes using 4-bit samples - giving a transmission rate of __ Kbps.






49. __ builds in some reliability to the connectionless __ protocol - enables reliability with out using the overhead of __ - what protocol send multiples of the same packet __






50. ___describes CELP compression that enables __ to be coded into _ Kbps streams;