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






2. __ __ conceals interarrival packet delay variation.






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






4. PCM and ADPCM are examples of __ __






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






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






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






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






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






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






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






12. __ __ replays the last packet received






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






14. 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.






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






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






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






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






19. 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.






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






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






22. 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)






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






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






25. 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).






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






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






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






30. 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.






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






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






33. 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






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






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






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






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






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






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






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






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






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






43. Who scored highest in the MOS






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






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






46. 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






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






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






49. 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.






50. Is the variation of packet interarrival time.