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






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






3. 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.






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






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






6. Is the variation of packet interarrival time.






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






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






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






10. __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






11. Who scored highest in the MOS






12. 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.






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






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






15. 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






16. 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).






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






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






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






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






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






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






23. 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.






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






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






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






27. 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






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






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






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






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






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






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






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






35. 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






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






37. 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)






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






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






40. PCM and ADPCM are examples of __ __






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






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






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






44. 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.






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






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






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






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






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






50. 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)