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. 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.






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






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






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






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






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






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






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






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






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






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






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






13. 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.






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






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






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






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






18. Is the variation of packet interarrival time.






19. 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.






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






21. 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)






22. __ __ replays the last packet received






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






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






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






26. 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






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






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






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






30. 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.






31. Who scored highest in the MOS






32. 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)






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






34. 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.






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






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






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






39. __ 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






40. __ __ conceals interarrival packet delay variation.






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






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






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






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






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






46. 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).






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






48. 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






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






50. PCM and ADPCM are examples of __ __