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. PCM and ADPCM are examples of __ __






2. 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.






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






4. __ __ conceals interarrival packet delay variation.






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






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






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






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






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






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






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






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






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






14. __ __ replays the last packet received






15. 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.






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






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






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






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






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






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






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






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






24. 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.






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






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. Is the variation of packet interarrival time.






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






29. Who scored highest in the MOS






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






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






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






33. 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






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






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






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






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






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






39. 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.






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






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






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






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






44. 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).






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






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. 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)






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






49. 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.






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