Duplicate page content

[DolbySEO]

I'm seeing duplicate page content for tagged URLs.

For example:
http://www.dolby.com/us/en/about-us/careers/landing.html
http://www.dolby.com/us/en/about-us/careers/landing.html?onlnk=al-sc

as well as PPC campaigns.

We tag certain landing pages purposefully in order to understand that traffic comes from these pages, since we  use Google Analytics and don't have the abiility to see clickpaths in the package we have.

Is there a way to set parameters for crawling to exclude certain pages or tagged content, such as those set up for PPC campaigns?

[ReferralCandy]

Yes, pointing the canonical tags on your landing pages or specific campaign pages to your original page which is this should do the job:

http://www.dolby.com/us/en/about-us/careers/landing.html

[StreamlineMetrics]

The first thing I would suggest is setting your canonical tag to tell the search engines which version of the URL is the preferred URL. Here is more info - http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html.

You can also exclude parameters within Google Webmaster Tools, but in this scenario you should be good to go with the canonical tags as long as they are set up correctly.