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






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






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






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






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






6. __ __ replays the last packet received






7. 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






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






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






10. 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)






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






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






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






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






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






16. 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.






17. 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






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






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






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






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






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






23. 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)






24. 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.






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






26. 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.






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






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






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






30. 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).






31. PCM and ADPCM are examples of __ __






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






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






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






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






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






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






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






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






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






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






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






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






44. 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.






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






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. 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.






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






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






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