星期一, 8月 03, 2009

Physical and data-link layer support resources

1. Suppose that you are a network engineer troubleshooting a problem at the physical layer. In doing this, you want to quickly access information about the latest industry standards.
The web sites of which organizations are most likely to provide this information?

ATM Forum
IETF
ITU-T
Microsoft



2. Suppose you are troubleshooting a problem at the data-link layer. You are at the stage of evaluating and documenting the changes you are making.
If you perform a set of problem-solving steps, which are completely unsuccessful, what should you do?

You evaluate and document the changes and the results of each change that you make
You should immediately undo any changes that you have made
You make initial hardware and software configuration changes
You verify that the changes you made actually fixed the problem without introducing any new problems
You verify that you have a valid saved configuration for any device on which you intend to modify the configuration



3. Suppose you are troubleshooting a problem at the data-link layer. You are at the stage of evaluating and documenting the changes you are making and realize that the problem is intermittent.
What should be the next step you perform?

You evaluate and document the changes and the results of each change that you make
You make initial hardware and software configuration changes
You need to wait to see if the problem occurs again before you can evaluate the effect of your changes
You verify that the changes you made actually fixed the problem without introducing any new problems
You verify that you have a valid saved configuration for any device on which you intend to modify the configuration



4. As a general approach when correcting an isolated problem at the physical or data-link layer, what is the first thing you should do?

You evaluate and document the changes and the results of each change that you make
You make initial hardware and software configuration changes
You verify that the changes you made actually fixed the problem without introducing any new problems
You verify that you have a valid saved configuration for any device on which you intend to modify the configuration




5. Which website would you most likely use to find the latest detailed technical documentation about the PPP protocol?

www.apple.com
www.ietf.org
www.linux.org
www.sniffers.com

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