| Author |
please help CCDA urgently!!!!
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| kennyjava 2001-12-10, 12:02 am |
| Can someone please give me the correct answer,thanks.
1)Use Cisco IOS network encryption if router utilization is
______ or lower.
A.10%.
B.40%.
C.60%.
D.80%.
Answer:_______ | |
| pcwizzard 2001-12-10, 12:32 am |
| 'C' | |
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| If I recall correctly it is B 40%.
We have a difference in opinion.
Have a look at the Cisco web site, it'll be there somewhere! If I get a chance I'll look at the DCN book tonight. | |
| kavita 2001-12-10, 8:56 am |
| Use encryption only when CPU utilization is under 65%. Keep in mind - from "network health check" perspective, CPU utilization on routers should always be less than 75%. | |
| pcwizzard 2001-12-10, 6:29 pm |
| Only use encryption is CPU utilization is less than 65%, so 'C' 60% and lower is the correct answer. | |
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| I've looked up the answer in the DCN book by Cisco Press, P226/227.
It says :
Cisco recommends that you disable compression or encryption if the router CPU load exceeds 40%.
HTH | |
| pcwizzard 2001-12-11, 2:37 pm |
| The CCDA Study Guide by Sybex - Authored by Todd Lammle and Donald Porter.
Page 333-334 : " The routers CPU load must not exceed 65% when running software compression or encryption. "
So by this you could run software compression and encryption when the routers CPU is at 60% and lower utilization.
The only 40% I found was that; "Ethernet segments should not exceed 40% network utilization." - page 112
"Router CPU utlization should not exceed 75%." - page 113
So the correct answer to the question which states: 1)Use Cisco IOS network encryption if router utilization is
______ or lower.
A.10%.
B.40%.
C.60%.
D.80%.
Answer: C. 60%
If you read the question, the answer is clear..... | |
| kennyjava 2001-12-11, 6:15 pm |
| really thanks to all.
I think the answer is 'B'. | |
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| quote:
Originally posted by pcwizzard
The CCDA Study Guide by Sybex - Authored by Todd Lammle and Donald Porter.
It's a Cisco exam - they want Cisco answers, I suggest you start investing in Ciscopress, Sybex are good for CCNA but the general opinion is they are no good for CCNP.
Unless you can prove me wrong using Cisco website I would go for B. | |
| pcwizzard 2001-12-12, 9:32 am |
| Its up to you what to make of things....A person asks a question and I give them the answer and people may disagree with me. In the end its up to that person to research and find the correct answer. I dont have to prove anything. I did look it up on Cisco's website when I was going to take the CCDA exam. I think I will leave it at that. | |
| haseeb_eng 2001-12-12, 10:49 am |
| I agree with MAT P . This is what i find out from cisco documentation . The correct answer is B | |
| pcwizzard 2001-12-12, 3:37 pm |
| Since everyone thinks that 'C' is wrong - SHOW ME!!! I read DCN by Cisco Press today and saw no mention of when to disable encryption on the pages you speak of. I am open to the idea I am wrong. You say prove it to you, prove it to me! I dont want to be wrong in the future, so please show me. Every document I have read on this says to disable encryption if above 60%, so that only stands to reason that 60% and below is correct. This is why I dont ask questions on here unless I find contradicting information in the study guides, then I may ask. One thing for sure is that I always look up the right answer for myself. So MATP and haseeb_eng, prove me wrong - SHOW ME THE INFO!!!! | |
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| quote:
Originally posted by pcwizzard
Its up to you what to make of things....A person asks a question and I give them the answer and people may disagree with me. In the end its up to that person to research and find the correct answer. I dont have to prove anything. I did look it up on Cisco's website when I was going to take the CCDA exam. I think I will leave it at that.
This is getting beyond a joke - You don't have to prove anything, and your going to leave it at that - then you tell me to prove myself!!!
As I already said, P227 line 2 word 1.......Though it is spread over P226/227
ISBN no.1-57870-105-8, Ciscopress , DCN.
I don't want to argue about this - as you were so sure I spent over an hour searching CCO and TAC for the correct answer - this is the only place I have seen it stated by Cisco, its not even in the exam cert guide (are you definately reading Designing Cisco Networks??).
If you can't see it I guess the only way of proving it is for me to highlight the page and post the book to yourself (at your expense)....
But thats probably overkill LOL.
I hope your not starting to take this personally!! | |
| pcwizzard 2001-12-13, 9:16 am |
| Never personal...... Just having some fun. | |
| darthfeces 2001-12-13, 11:12 pm |
| http://www.cisco.com/warp/public/707/
since processors vary this can be less or more
acceptable depending on whether it is a low end
or high end cpu !
remember you never want to exhaust
ram, bandwidth, or cpu cycles.
i think cisco says 40% it's a guideline though.
remember everyone's favorite answer "it depends"
you are also supposed to monitor your routers
performance closely after enabling encryption. | |
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| darthfeces 2001-12-17, 10:51 am |
| and now from the previously quoted site:
In most cases the cpu utilization was high during the test. For example, on the 7505 the cpu utilization was running between 70 and 75%.
In general, Cisco prefers to see the cpu utilization below these numbers. So one needs to consider what other cpu intensive tasks the router might be doing, when estimating the amount of traffic that will need IP Security services.
These numbers do not imply that encryption should take place on serial lines equal to or below the listed bandwidth. However, the approximate amount of data that should be selected to encrypt and decrypt should ideally be less than these values . When generating these numbers as a guideline for the mission-specific access boxes (the Cisco 1000, 1600, and 2500) it was expected that there would be little else running on the routers when they are configured for encryption. On the higher-end
access boxes (the Cisco 4000, 4500, and 4700) as well as the core products (Cisco 7200 and 7500), more leeway was left for other simultaneous CPU-intensive processes. Deploying encryption on one of the platforms in the first group while doing many other CPU-intensive operations requires the amount of encrypted traffic to be pared down. In either case, the total CPU load on the router while just doing encryption should be below 60 percent. | |
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| Well found - I spent ages looking for that, I even found that page but missed the quote!!
To summarise the info then, C is the correct answer as long as with encryption alone the CPU load is below 60%.
......however, the quote says "while just doing encryption should be below 60 percent" which would make the actual answer B as with this definition encryption shouldn't be enabled if CPU load actually reaches 60%.
Or am I being a little padantic??
Good question, it had quite a few looking! | |
| pcwizzard 2001-12-17, 9:31 pm |
| This is still going on? It seems that there might be two different answers to this question, the task is to find out which one is right. Most of the books I have read have stated that encryption can be started when CPU is at 60% or below. This is the way that I learned and this is what I go by. I have read the information provided by the links and I do not see any proof to the contrary. What I see is that Cisco would like to see CPU load below 60%, but what they would like to see and when encryption can be started are two different things. The only thing I can add is to why its 60% and below is that when you enable encryption it can add up to 15% to the load of the CPU, depending on other CPU intensive processes that may be going on. If it was any higher then the CPU load would be staturated(75% and above). So if you were only enabling encryption, then I would still say that 60% and below would be the correct answer. | |
| darthfeces 2001-12-17, 9:50 pm |
| the point is there is no one correct answer
as cisco loves to state "it depends"
on processor .. ram and the environment that
the participating router is part of and the role
it plays.
for testing purposes as a general guideline use
60%
now for this thread ttl = 255 |
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