NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the senior notes at 'AAAsf' and subordinate notes at 'AAsf' for SLM Student Loan Trust 2011-3 (SLM 2011-3). The Rating Outlook remains Stable for all notes. KEY RATING DRIVERS High Collateral Quality: The trust collateral comprises Federal Family Education Loan Program (FFELP) loans with guaranties provided by eligible guarantors and reinsurance provided by the U.S. Department of Education (ED) for at least 97% of principal and accrued inter