Cisco Opitical Exam 642-311

Has anyone taken the 642-311 exam? If so, On a scale of 1-10, how hard is the test? I've been working with Sonet everyday for seven years but I've only recently started working with CISCO's 15454. So, Understand the Sonet signal very well.... but I'm still learning the 15454.

I'm hoping to find a few sample question... maybe 5-10. I just to give me idea of what to except.


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