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






2. 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).






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






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






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






6. __ 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






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






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






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






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






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






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






13. Who scored highest in the MOS






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






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






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






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






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






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






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






21. 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






22. 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.






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






24. PCM and ADPCM are examples of __ __






25. 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.






26. What do you use to compress RTP header to 2 or 4 bytes






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






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






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






30. __ __ replays the last packet received






31. __ __ conceals interarrival packet delay variation.






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






33. __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






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






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






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






37. 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.






38. RTCP provides support for real-time conferencing of __ of any size within an Internet - does not send __ - offers __and supports __ media streams






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






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






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






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






43. 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






44. 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.






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






46. To reduce the overall ___ overhead introduced by the 54-byte header - multiple voice samples can be packed into a single Ethernet frame to transmit. Although this can increase the voice ___ - increasing this count can improve the overall voice___ - e






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






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






49. 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.






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