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






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






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






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






5. 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.






6. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






23. 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)






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






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






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






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. 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)






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






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






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. __ __ conceals interarrival packet delay variation.






34. __ __ replays the last packet received






35. Is the variation of packet interarrival time.






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






37. Who scored highest in the MOS






38. 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).






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. 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.






41. __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






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






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






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






45. PCM and ADPCM are examples of __ __






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






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






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






49. 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






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