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






2. __ 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






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






4. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






18. Is the variation of packet interarrival time.






19. __ __ conceals interarrival packet delay variation.






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






21. 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.






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






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






24. 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.






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






26. 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






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






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






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






30. 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)






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






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






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






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






36. PCM and ADPCM are examples of __ __






37. 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






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






39. __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






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






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






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






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






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. Proxy server is not required in an __ based system






46. Who scored highest in the MOS






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






48. 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)






49. 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.






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