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. 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






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






3. 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.






4. 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






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






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






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






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






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






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






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






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






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






15. 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.






16. __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






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






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






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






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






21. Who scored highest in the MOS






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






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






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






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






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






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






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






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






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






31. 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.






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






33. 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)






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






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






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






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. 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.






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






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






41. PCM and ADPCM are examples of __ __






42. __ 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






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






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






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






46. 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.






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






48. __ __ conceals interarrival packet delay variation.






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






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