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






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






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






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






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






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






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






8. 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).






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






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






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






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






13. 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)






14. Is the variation of packet interarrival time.






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






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






17. 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






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






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






20. 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.






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






22. __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






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






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






25. 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






26. 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






27. __ 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






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






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






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






31. 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.






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






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






34. __ __ conceals interarrival packet delay variation.






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






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






37. 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.






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






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






40. 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)






41. 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.






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






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






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






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






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






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






48. 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.






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






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