Pass4sure Cisco CCNP 642-845 Exam
ONT – Optimizing Converged Cisco Networks : 642-845 Exam
Exam Number/Code: 642-845
Exam Name: ONT – Optimizing Converged Cisco Networks
VUE Code: 642-845
Questions Type: Multiple choice,
“ONT – Optimizing Converged Cisco Networks”, also known as 642-845 exam, is a Cisco certification.
Preparing for the 642-845 exam? Searching 642-845 Test Questions, 642-845 Practice Exam, 642-845 Dumps?
With the complete collection of questions and answers, Pass4sure has assembled to take you through 217 Q&As to your 642-845 Exam preparation. In the 642-845 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
Questions and Answers : 217 Q&As
Updated: May 9th , 2008
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The Optimizing Converged Cisco Networks (642-845 ONT) is a qualifying exam for the Cisco Certified Network Professional CCNP®. The ONT 642-845 exam will certify that the successful candidate has important knowledge and skills in optimizing and providing effective QOS techniques for converged networks. The exam topics include implementing a VOIP network, implementing QoS on converged networks, specific IP QoS mechanisms for implementing the DiffServ QoS model, AutoQoS, wireless security and basic wireless management.
QUESTION NO: 7
You want to ensure the highest call quality possible for all VOIP calls in the
Certifyme.com network. Which codec standard would provide the highest voice-quality,
mean opinion score (MOS)?
A. G.711, PCM
B. G.729, CS-ACELP
C. G.729A, CS-ACELP
D. G.728, LDCELP
E. None of the above
Answer: A
Explanation:
When a call is placed between two phones, the call setup stage occurs first. As a result of
this process, the call is logically set up, but no dedicated circuits (lines) are associated
with the call. The gateway then converts the received analog signals into digital format
using a codec, such as G.711 or G.729 if voice compression is being used.
When analog signals are digitized using the G.711 codec, 20 ms of voice consists of 160
samples, 8 bits each. The result is 160 bytes of voice information. These G.711 samples
(160 bytes) are encapsulated into an RTP header (12 bytes), a UDP header (8 bytes), and
an IP header (20 bytes). Therefore, the whole IP packet carrying UDP, RTP, and the
voice payload has a size of 200 bytes. When G.711 is being used, the ratio of header to
payload is smaller because of the larger voice payload. Forty bytes of headers are added
to 160 bytes of payload, so one-fourth of the G.711 codec bandwidth (64 kbps) has to be
added. Without Layer 2 overhead, a G.711 call requires 80 kbps.
QUESTION NO: 8
When a router converts analog signals to digital signals as part of the VoIP process,
it performs four separate steps. From the options shown below, which set of steps
contains the steps in their correct sequence?
A. encoding
quantization
optional compression
sampling
B. optional compression
encoding
sampling
quantization
C. sampling
quantization
encoding
optional compression
D. optional compression
sampling
encoding
quantization
E. sampling quantization
optional compression
encoding
F. encoding
optional compression
quantization
sampling
G. None of the above
Answer: C
Explanation:
Step 1 Sampling: The analog signal is sampled periodically. The output of the sampling
is a pulse amplitude modulation (PAM) signal.
Step 2 Quantization: The PAM signal is matched to a segmented scale. This scale
measures the amplitude (height) of the PAM signal.
Step 3 Encoding: The matched scale value is represented in binary format.
Step 4 Compression:
Optionally, voice samples can be compressed to reduce bandwidth requirements.
Analog-to-digital conversion is done by digital signal processors (DSPs), which are
located on the voice interface cards. The conversion is needed for calls received on
analog lines, which are then sent out to a packet network or to a digital voice interface.
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ONT – Optimizing Converged Cisco Networks : 642-845 Exam
Pass4sure 642-845 Exam Questions
* Updated: November 4th , 2008
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Product Description
Exam Number/Code: 642-845
Exam Name: 642-845 Value Pack
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* Questions and Answers : 341 Q&As
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ONT – Optimizing Converged Cisco Networks
“ONT – Optimizing Converged Cisco Networks”, also known as 642-845 exam, is a Cisco certification.With the complete collection of questions and answers, Pass4sure has assembled to take you through 341 Q&As to your 642-845 Exam preparation. In the 642-845 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
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642-845 Preparation Labs
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Feedbacks
* “So after 1 yr and a lot of study i finally did it..CCNP
I cleared ONT today with 989/1000. Do not worry – Prepare and use P4S and you are guaranteed a pass.
If you actually KNOW QoS you can almost pass this test on that knowledge alone. Probably 80/10/10 split between QoS/Wireless security/VoIP. Very easy test in my opinion, but then again, I have lots of experience with QoS and VoIP. Cisco ONT class material is all you need for this one.
ONT is the easist exam i have done for CCNP.
So, i am going on to CCDA and CCDP”
* — Mohamad (Oct, 13 2008)
* “Passed!!!! With a 1000/1000.
Make sure you review:
Analog to Digital = (1) Sampling, (2) Quanitization, (3) Coding, & (4) (the optional Compression)
Digital to Analog = 1 Decompression, 2 Decoding, 3 Reconstruction of Analog Signal
& review Queuing Techniques / differences between them
Next … maybe CCIE or CCSP…still need to think about it..
Thanks Pass4sure!!!”
* — Dietmar (Oct, 12 2008)
* “Passed this morning with a 944. All questions but maybe 2 are straight out of P4S.
Got all from the P4S: the drag-and-drops, the SDM Simlet, and the other new citrix simlet.
Now that I’ve renewed my CCNP, I’m off to re-new my CCDP and CCIE written. Let this be a lesson to all you kiddies out there, do NOT let your certs expire, talk about a PITA to renew…”
* -
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