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Steve
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Quality of Service (642-642) Exam Topic Links and Feedback

Mon Aug 22, 2011 3:49 pm

Topic Links

Queuing Principles in Cisco IOS
http://wiki.nil.com/Queuing_Principles_in_Cisco_IOS

Policing vs shaping
http://wiki.nil.com/Policing_vs_shaping

QoS Policing in Cisco IOS
http://wiki.nil.com/QoS_Policing_in_Cisco_IOS

Traffic shaping in Cisco IOS
http://wiki.nil.com/Traffic_shaping_in_Cisco_IOS

Layer 3 QoS: IP ToS, Precedence, CoS, IntServ, and DiffServ Codepoints
http://etutorials.org/Networking/Integr ... odepoints/

QoS (Quality of Service) Features
http://www.netcraftsmen.net/resources/a ... s/435.html

QoS Tutorial
blog/?p=49

QoS Wiki
http://mynetworkingwiki.com/index.php/QoS

RSVP Protocol Overview
http://www.isi.edu/rsvp/overview.html

Learn the benefits of Cisco AutoQoS
http://www.techrepublic.com/article/lea ... os/6134065

Configure QoS on your Cisco router with this template
http://www.techrepublic.com/article/con ... te/6136216

Limit bandwidth on a Cisco Catalyst switch port
http://www.techrepublic.com/blog/networ ... h-port/404

Policing and Shaping - Token Bucket Principles
http://www.perihel.at/2/rno/04-QoS-Poli ... haping.pdf

Understanding WRR Queue Parameters
http://blog.ine.com/2008/07/20/undestan ... arameters/

Congestion Management Overview
http://www.cisco.com/en/US/docs/ios/12_ ... conmg.html

A Two Rate Three Color Marker
http://tools.ietf.org/html/rfc2698

A Single Rate Three Color Marker
http://tools.ietf.org/html/rfc2697


Exam Feedback
Feedback from those who have taken the exam will go here.


Other Info
Please reply to this thread with additional information, corrections, etc. The mods/admin will update the original post.

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Fri Aug 26, 2011 1:11 pm


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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Fri Aug 26, 2011 2:34 pm

Added, ty.

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Wed Oct 19, 2011 4:36 am

Hell yeah. Thanks. This may be my next exam. Not sure which CCIP of the 3 I want to do first though.

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Wed Oct 19, 2011 9:08 am

FlipRich wrote:Hell yeah. Thanks. This may be my next exam. Not sure which CCIP of the 3 I want to do first though.


most certainly do BGP before MPLS, there is a ton of BGP on the MPLS exam.
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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Thu May 03, 2012 3:25 pm

I don't know if it's "general knowledge", but to convert AF values to DSCP:

AF vw --> DSCP xy

xy = (v*8)+(w*2)

Example AF 43:
AF (4x8)+(3*2) = DSCP 38

Example AF 22:
AF (2x8)+(2x2) = DSCP 20

I seriously don't know if I just "invented" this shortcut or not, but christ I'm happy.


edit
awwww man I didn't invent it, actually this guy explains it exactly the same way:
http://dreamforccie.wordpress.com/2010/ ... s-so-easy/

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Sat Jun 09, 2012 10:49 am

It can be done by remembering how many bits the different markings use. For example CoS uses three bits to mark. DiffServ uses 6. ToS is 6 bit DSCP + 2 bits for ECN.

Example :

CoS : 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7
DSCP : 0 , 8 , 16, 24 , 32 , 46 , 48 , 56

dscp = cos X 8
for AF it's just that plus those 2 bits. The way I see it is that you;ll go mad if you try to get this stuff or remember it. It has no importance whatsoever. None. Mark on L2 or L3 , do the what u need to do and don't think about it. It is relevant only when doing mappings and I seriously doubt that a provider maps that shit. They do communities that only transport Ip precedence.
Also there is a command like sh mls qos map(s) cos-dscp (or other maps). There are the DSCP mutations. Again... you have to be really mad to learn these :)

Btw : http://www.cisco.com/en/US/docs/ios/qos ... _book.html
Stay the curse !

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Mon Feb 11, 2013 7:54 am

Thanks for the info. I realize they have many exams they don't have books for, but I didn't think an entry level exam would be a good place to do that. Thanks again.
Hadriya

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Mon Feb 11, 2013 4:28 pm

hadriya9091 wrote:Thanks for the info. I realize they have many exams they don't have books for, but I didn't think an entry level exam would be a good place to do that. Thanks again.


The now retired QoS exam had the telephony guide written by Odem...

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Mon Feb 11, 2013 4:45 pm

stevester1 wrote:
hadriya9091 wrote:Thanks for the info. I realize they have many exams they don't have books for, but I didn't think an entry level exam would be a good place to do that. Thanks again.


The now retired QoS exam had the telephony guide written by Odem...

642-642 QoS is actually not retired, yet. Its still usable against CCNP Voice and some Telephony Specialist cert. Also hardly an entry level exam eh :)
som om sinnet hade svartnat för evigt.

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Mon Feb 11, 2013 4:51 pm

srg wrote:
stevester1 wrote:
hadriya9091 wrote:Thanks for the info. I realize they have many exams they don't have books for, but I didn't think an entry level exam would be a good place to do that. Thanks again.


The now retired QoS exam had the telephony guide written by Odem...

642-642 QoS is actually not retired, yet. Its still usable against CCNP Voice and some Telephony Specialist cert. Also hardly an entry level exam eh :)


Ah my bad, I thought the 642 retired with the CCIP.

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Wed Sep 25, 2013 2:06 pm

This might be a cert that I will consider in the future. QoS is like greek to me... so much detail it's like a whole 'nother world of networking. I can understand the basics but doing the cert will probably reinforce the subject a little better.
Good luck & Have fun.


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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Wed Sep 25, 2013 4:53 pm

f0rgiv3n wrote:This might be a cert that I will consider in the future. QoS is like greek to me... so much detail it's like a whole 'nother world of networking. I can understand the basics but doing the cert will probably reinforce the subject a little better.


I can honestly say that test SUCKED BALLS!! The test itself was not that difficult but studying QoS is like sticking a glowing hot fork in my eye. There really isnt a good way to lab up the topics and QoS material is just dry and mind numbing.

Also it seems there are a 100 different ways to configure each topic which makes it very difficult to keep up with from week to week.

Through all my CCNP test QoS was the worst.

Just sayin
http://blog.movingonesandzeros.net/

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Wed Sep 25, 2013 6:11 pm

With both CCIP and CCVP discontinued I would guess this will disappear as well sooner than later.

sent from phone
som om sinnet hade svartnat för evigt.

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Re: Quality of Service (642-642) Exam Topic Links and Feedba

Mon Dec 30, 2013 1:59 pm

after reading this thread's links
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