Schedule II - Valuation and Qualifying Accounts

12 Months Ended

May 21, 2013

Schedule II - Valuation and Qualifying Accounts

NetScout Systems, Inc.

Schedule II—Valuation and Qualifying Accounts

(in thousands)

	Balance at Beginning of Year		Additions Resulting in Charges to Operations		Charges to Other Accounts			Deductions Due to Write-Offs			Balance at End of Year
Year ended March 31, 2011
Allowance for doubtful accounts	$	427	$	8	$	35		$	(124	)	$	346
Deferred tax asset valuation allowance	$	249	$	0	$	0		$	0		$	249
Year ended March 31, 2012
Allowance for doubtful accounts	$	346	$	96	$	63		$	(279	)	$	226
Deferred tax asset valuation allowance	$	249	$	0	$	3,280	(1)	$	0		$	3,529
Year ended March 31, 2013
Allowance for doubtful accounts	$	226	$	560	$	284		$	(99	)	$	971
Deferred tax asset valuation allowance	$	3,529	$	101	$	165		$	0		$	3,795

(1) Recorded in connection with the acquisition of Psytechnics.