NWEN303 previous exams (note the course has changed in emphasis in 2014). Where possible answers are provided.
2014: terms test
2013: exam
2012: exam
2011: exam
2010: exam
2009: exam
Prior to 2009, COMP 310 covered some of the same material as NWEN 303 (in particular on distributed algorithms).
Refer to its Exam archive for example exams.