You should backup your work often. You are responsible for getting your work to the instructor on time. Students are responsible for timely notification of unexpected problems to the instructor. He cannot help you, if you do not tell him. Students taking this course are likely to become network administrators.
Network administrators spend the largest part of their workday communicating with others.
This communication requires mastery of the English language. Your grade in this course will include grading your English communication. The system allows the instructor to disable any unit, if your assignment is past due or late. If your access to the system is beyond the expected date, you must contact the instructor to access past due units. When you look-over the textbook, you will note that the book has Activities at the end of each lesson.