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






2. __ __ conceals interarrival packet delay variation.






3. 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.






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






5. 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






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






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






8. 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.






9. 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.






10. 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)






11. 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.






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






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






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






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






16. RTP consists of a __ __ and a control part the called __






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






18. 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






19. The difference between when the packet is expected and when it is actually received is __. - exists only in __ ___ networks






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






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






22. To make audio and video work with RTP what do you need. 2 things






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






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






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






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






27. Is the variation of packet interarrival time.






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






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






30. How many times can a digital to analog conversion in my network and PSTN total network happen - __ speech is less robust conversion






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






32. __by default - sends two 10-ms G.729 speech frames in every packet - If you send more __ frames you put in a packet the fewer ___ you require but if you loose a packet the more __ you lose






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






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






35. Who scored highest in the MOS






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






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






38. 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).






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






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






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






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






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






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






45. __ the 64 Kbps __ voice coding technique - This is used for the digital voice delivery in the __ or __






46. __ 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






47. In an unmanaged - congested network - ___delay can add up to two seconds of delay (or result in the packet being dropped). This lengthy period of delay is___ in almost any voice network. delay)






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






49. Propagation delay in conjuction with handeling delay can cause noticeable






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