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. __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






2. 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.






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






4. 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






5. 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.






6. 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.






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






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






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






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






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






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






13. 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.






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






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






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






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






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






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






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






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






22. 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






23. [email protected] is a __ entry but coverts then to an __ address






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






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






26. __ 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






27. PCM and ADPCM are examples of __ __






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






29. 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.






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






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






32. __ __ conceals interarrival packet delay variation.






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






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






35. 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)






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






37. 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).






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






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






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






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






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






43. Is the variation of packet interarrival time.






44. 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)






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






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






47. 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






48. __ __ replays the last packet received






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






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