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






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






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






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






5. __ __ conceals interarrival packet delay variation.






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






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






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






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






10. 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






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






12. 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.






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






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






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






16. 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.






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






18. 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.






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






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






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






22. 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.






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






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






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






26. 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).






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






28. __ __ replays the last packet received






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






30. __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






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






32. 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






33. __ 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






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






35. Who scored highest in the MOS






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






37. Is the variation of packet interarrival time.






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






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






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






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






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






43. 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)






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






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






46. 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.






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






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






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






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