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






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






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






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






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






6. __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






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






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






9. PCM and ADPCM are examples of __ __






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






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






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






13. 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.






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






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






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. Is the variation of packet interarrival time.






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






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






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






21. 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)






22. 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.






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






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






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






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






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






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






30. 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.






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






32. 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






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






34. 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).






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






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






37. __ __ conceals interarrival packet delay variation.






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






39. __ 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






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






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






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






43. 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.






44. 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.






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






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






47. Who scored highest in the MOS






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






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






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