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






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






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






4. 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






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






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






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






8. 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






9. 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.






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






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






12. PCM and ADPCM are examples of __ __






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






14. 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






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






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






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






18. 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.






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. Is the variation of packet interarrival time.






21. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






38. __ __ conceals interarrival packet delay variation.






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






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






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. __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






43. Who scored highest in the MOS






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






45. 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.






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






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






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






49. 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)






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







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