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. How do you fix queuing delay - you would add






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






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






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






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






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






7. 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






8. __ __ replays the last packet received






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






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






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






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






13. 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






14. Is the variation of packet interarrival time.






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






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






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






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






19. 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.






20. Who scored highest in the MOS






21. 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






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






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






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






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






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






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






28. __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






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






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






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






32. 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.






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






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






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






36. 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)






37. 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.






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






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






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






41. 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.






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






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






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






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






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






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






48. PCM and ADPCM are examples of __ __






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






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