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. 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.






2. Who scored highest in the MOS






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






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






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






6. PCM and ADPCM are examples of __ __






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






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






9. 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






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






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






12. __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






13. __ __ replays the last packet received






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






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






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






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






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






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






20. 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)






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






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






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






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






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






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






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






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






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






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






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






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






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






34. __ __ conceals interarrival packet delay variation.






35. 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.






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






37. Is the variation of packet interarrival time.






38. 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






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






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






41. __ 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






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






43. 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.






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






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






47. 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).






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






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






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