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. Propagation delay in conjuction with handeling delay can cause noticeable






2. Who scored highest in the MOS






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






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






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






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






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






8. 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.






9. 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)






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






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






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






13. 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






14. __ 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






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






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






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






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






20. 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).






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






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






23. 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.






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






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






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






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






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






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






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






31. __ __ conceals interarrival packet delay variation.






32. 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.






33. __ __ replays the last packet received






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






35. 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.






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






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. PCM and ADPCM are examples of __ __






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






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






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






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






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






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






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






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






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






48. Is the variation of packet interarrival time.






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






50. 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)