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 the variation of packet interarrival time.






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






3. 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.






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






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






6. PCM and ADPCM are examples of __ __






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






8. __ __ conceals interarrival packet delay variation.






9. __ __ replays the last packet received






10. Who scored highest in the MOS






11. 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






12. 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)






13. 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.






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






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






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






17. 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






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






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






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






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






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






23. 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.






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






25. 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).






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






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






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






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






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






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






32. 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.






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






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






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






36. __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






37. __ 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






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






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






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






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






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






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






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






46. 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






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






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






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






50. 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.