The Cisco Optical SDH 642-321 exam is one of the two qualifying theater exams available to candidates pursuing the Cisco Optical Specialist certification. The 642-321 SDH exam is recommended for candidates in Americas, APAC (except Korea), EMEA, and Japan. Test materials covered in the recommended Cisco Optical Specialist curriculum: Cisco ONS 15454 SDH Turn Up, Text, Provisioning, and Operation Training (OSTPO); Cisco ONS 15216 Provisioning and Operation Training (OPODA); and Optical Fundamentals (OF).
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