Voice Fundamentals

Question 2

Which network component would cause variable network delay?

Answer: C
From ICOMM 8.0 Student Guide vol 1 – Undertstanding the characteristics of Cisco Unified Communications Solutions – Overview of Packet-Oriented Networks PAG 1-53

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Q2 – C
Serialization delay (fixed)
Propagation delay (fixed)
Queuing delay (variable)
Forwarding/processing delay (variable)
Shaping delay (variable)
Network delay (variable)
Codec delay (fixed)
Compression delay (variable)

@sandrob….

the answer is propagation delay bcoz wen a packet travels from one hop to another hop the propagation delay comes into picture which depicts variable network delay… the processing, serializing and all other delay’s are constrained to source(processors or links)…..

correct me if i m wrong….thank you guys..

Good job on this site.

Anyways, as one have asked, Can someone provide a PDF of 640-461? or any study materials to complete this course? This would be very helpful.

Thanks in advance.

Regards,

Mark

Where can I download “ICOMM 8.0 Student Guide” ?

Where can I download “ICOMM 8.0 Student Guide” ?

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Hello to All,

Can you please somebody send me the offical study guide for ICOMM v8.0 640-461??
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e-mail: stefan_ig@yahoo.co.uk

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Delay issues: Delay isthe time that ittakes for a packet toreach the receiving endpoint
after being transmitted from the sending endpoint. This time iscalled the “end-to-end
delay.” and consists of two components:
— Fixed networkdelay: Two types of fixed delays areserialization and propagation
delays. Serialization isthe process of placing bits onthe circuit. The higher the
circuit speed, the less time it takes to place the bits onthe circuit. Therefore, the
higher the speed ofthe link, the less serialization delay isincurred. Propagation
delay is the time that il lakes for frames to transit the physical media.
— Variable network delay: Processing delay is a type of variabledelay, and is the
time required for a networking device to look uptheroute, change the header, and
complete other switching tasks. Insome cases, thepacket must also be
manipulated—for example, when the encapsulation type orthe hop count must be
changed. Each of these steps can contribute to theprocessing delay.

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Hi friends – is it possible to have a copy of ICOMM 640-461 please as am sitting exam in 2 weeks. Many thanks in advance.

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VOICETUT can you verify question 2.

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Dear All
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Dear All
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According to the Cisco site all of these can be found as fixed delays accept processing. Using the process of elimination it has to be processing. From the cisco site it says “In general, the fixed components are from propagation delays on the trunks within the network, and variable delays are from queuing delays clocking frames into and out of intermediate switches.” Also referred to as processing. Also, another test document I have lists processing as the answer as well.

Q3 – F is correct:
Compressed RTP (CR) – Used when the IP, UDP, and RTP headers remain consistent. All three headers are compressed.

via:
http://www.cisco.com/en/US/tech/tk543/tk762/technologies_tech_note09186a0080108e2c.shtml

It is always better to read for your self. Then look over other “stuff”… but you have to feed your head with the correct info.

also check this link too

http://tools.ietf.org/html/rfc3545

and

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml
it says the same

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Hello friends for q-2 please visit link
http://www.sanog.org/resources/sanog7/prakash-shende-QoS-Low-Bandwidth-High-Delay-Links.pdf and check page no-7

Hey guys, I’m getting ready to take the ccna 640-461. What is the best material for me to look at? I will study all the 640-461 material on this website..should I look at the material for the old exam? 640-460? How different are the two exams?

about q2:
regarding to cisco press, there are 2 types of network delay: fixed and variable. As exampled of fixed, it names serialization and propagation delays; and it says that processing delay is a type of variable delay and “is the time required for a networking device to look up the route, change the header, and complete other switching tasks.”
So, the answer to question 2 is, regarding to cisco press, C.

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is there any voice labs/simulation for 642-461 exam???

hi can any one guide me how to install cisco call manager 8.0 on linux and how can I get the setup and setup information step by step . please guide me

thanx in advance

Hi Guys,

quick question ? where can I find sims to practice 640-461 exam ? is there any lab in real exam ?

Question 2: Which network component would cause variable network delay?

Answer E. propagation delay

I have been mulling over this one and I fear it is one of those “misleading” leading questions.

The question specifically refers to Network Component.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00800a8993.shtml

“Network Switching Delay

The public frame relay or ATM network that interconnects the endpoint locations is the source of the largest delays for voice connections. Network Switching Delays (ωn) are also the most difficult to quantify.

If wide-area connectivity is provided by Cisco equipment, or some other private network, it is possible to identify the individual components of delay. In general, the fixed components are from propagation delays on the trunks within the network, and variable delays are from queuing delays clocking frames into and out of intermediate switches.”

In addition, refer to Tables: Table 6 .1: Single Hop Delay Calculation, Table 6.2: Two Hop Public Network Delay Calculation with Router/Gateway Tandem etc.

It implies the following:

A. dejitter buffer – FIXED
B. DSP delay – (Referred to as Coder Delay) FIXED
C. processing delay – (Referred to as Coder Delay) FIXED
D. serialization delay – FIXED
E. propagation delay – (Referred to as Network Delay) FIXED & VARIABLE

Please Discuss

I wrote the above comment and after further research and referring back to my ICOMM materials I have been left iscouraged.

ICOMM V8.0 1-53 “Variable network delay: Processng delay is a type of variable delay”

^ This was originally my gut response. It seems the logical answer.

voicetut / 9tut any feedback would be greatly appreciated

IRT Q2, it cannot be propagation delay.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00800a8993.shtml#howvoicecompworks

Network Switching Delay

The public frame relay or ATM network that interconnects the endpoint locations is the source of the largest delays for voice connections. Network Switching Delays (ωn) are also the most difficult to quantify.

If wide-area connectivity is provided by Cisco equipment, or some other private network, it is possible to identify the individual components of delay. In general, the fixed components are from propagation delays on the trunks within the network, and variable delays are from queuing delays clocking frames into and out of intermediate switches.

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About Q2, according to the ciscopress article below, none of the answers are correct.. But If I have to choose one, I would select letter E (propagation delay) as @Anonymous explained.

Latency

End-to-end delay, or latency, between any given sender and receiver comprises two types of delay:

Fixed-network delay—Includes encoding and decoding time and the latency required for the electrical and optical signals to travel the media en route to the receiver. Generally, applying QoS does not affect fixed-network delay because fixed-network delay is a property of the medium. Upgrading to higher-speed media such as 10 Gigabit Ethernet and newer network hardware with lower encoding and decoding delays, depending on application, may result in lower fixed-network delay.

Variable-network delay—Refers to the network conditions, such as congestion, that affect the overall latency of a packet in transit from source to destination. Applying QoS does affect the variable-network delay.

In brief, the following list details the types of delay that induce end-to-end latency (note that the first four types of delay are fixed delay):

Packetization delay—Amount of time that it takes to segment, sample, and encode signals, process data, and turn the data into packets.

Serialization delay—Amount of time that it takes to place the bits of a packet, encapsulated in a frame, onto the physical media.

Propagation delay—Amount of time it takes to transmit the bits of a frame across the physical wire.

Processing delay—Amount of time it takes for a network device to take the frame from an input interface, place it into a receive queue, and place it into the output queue of the output interface.

Queuing delay—Amount of time a packet resides in the output queue of an interface.

Of all the delay types listed, queuing is the delay over which you have the most control with QoS features in Cisco IOS. The other types of delay are not directly affected by QoS configurations. For this reason, this chapter focuses mostly on queuing delay.

Link: http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00800a8993.shtml

Guys,

is there any simulator available to build CCNA voice lab for practice ? like packet tracer..I heard about G3SN but you have to buy atleast one IOS to use it..

any ideas ?

Thanks

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Thank u .all

If wide-area connectivity is provided by Cisco equipment, or some other private network, it is possible to identify the individual components of delay. In general, the fixed components are from propagation delays on the trunks within the network, and variable delays are from queuing delays clocking frames into and out of intermediate switches. In order to estimate propagation delay, a popular estimate of 10 microseconds/mile or 6 microseconds/km (G.114) is widely used. However, intermediate multiplexing equipment, backhauling, microwave links, and other factors found in carrier networks create many exceptions.

Q2: E

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Hi does anyone have soft copy study resource for ICOMM 640-461

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Various contributors to delay are:
– Serialization delay (fixed)
– Propagation delay (fixed)
– Queuing delay (variable)
– Forwarding/processing delay (variable)
– Shaping delay (variable)
– Codec delay (fixed)
– Compression delay (variable)

For OU and EJ

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Can anyone send me a study guide for ICOMM 640-461 or videos?

Thanks

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Dear all
Kindly I need your advice about the different solutions to these 5 questions because I will go to exam next week

Q1 the exhibit shown that screen shot for a Cisco unified client services framework device
1. When configuring the service advertisement framework feature for call control discovery
2. when Cisco unified personal communicator version 8 is used in soft phone mode
Q2 which action must be taken for Cisco unified communicator clients to access Cisco unity connection voice mail
1. A Microsoft Exchange mailbox store must be configured in Cisco unified Presence
2. IMAP must be enabled on Cisco unity connection for users that need to access voice mail through Cisco unified personal communicator

Q3 which network component would cause variable network delay
1. Processing delay
2. Propagation delay

Q4 How does the Cisco Unified Communications Manager Express match an outbound VoIP dial peer?
1. Outbound dial-peer matching uses the entire string of digits en bloc to match the dial peer with the longest match.
2. Outbound dial-peer matching is completed on a digit-by-digit basis.
Q5 Drag & drop
1. Start -> Define Problem -> Gather Facts -> Consider Possibilities -> Create Action Plan -> Implement Action Plan -> Observe Results -> Ultilize Process
Do Problem Stop? -> Problem Resolved -> Document Facts -> Finished
Or
2. Start -> Define Problem -> Gather Facts -> Document Facts ->Consider Possibilities -> Create Action Plan -> Implement Action Plan -> Ultilize Process
Do Problem Stop? -> Observe Results -> Problem Resolved -> Finished
And there is no lab simulation in CCNA voice exam, kindly tell me your replies

Anybody who took CCNA 640-461 and encountered question 2? Any other remembered questions to share?