NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the class A-3 and class A-4 notes issued by Nelnet Student Loan Trust 2008-2 at 'AAAsf'. The Rating Outlook remains Stable for both notes. KEY RATING DRIVERS High Collateral Quality: The trust collateral consists of 100% Federal Family Education Loan Program (FFELP) loans. The credit quality of the trust collateral is high, in Fitch's opinion, based on the guarantees provided by the transaction's eligible guarantors and reinsurance provided