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The difference between PDF and Soft:

1. PDF: It is printable, readable and copyable. The requirements of reading: the computers should be installed Acrobat Reader.

2. Soft: Simulate the real test, which can make the candidates be familiar with the real exam environment.

Exam 642-311 is the official exam code of Optical Routing and Switching Written of Optical certification. If you need to get Optical certification, you may need to take other related exams. You can visit Optical certification subject to get more details, and you can find all Optical certification related exams there.

This site does not provide any exam information. If candidates need to ask the exam information, you can visit VUE or Prometric testing center to get the details.