oops... I just searched their site, I don't see the exam scheduled or retirement and can't find anyone mentioning it on any google search....so I think you're fine.
Yes, in theory the you should following and sit the CCENT first before CCNA R+S exam. The content cover every exam objective. The keys to success for Cisco exams:
- Practice, practice all commands to learn what they do.
2.Practice, practice all commands to the point of muscle memory.
- Practice, practice all commands to get fast (give yourself, regardless of question, 1 minute per question to read, understand and answer the questions--even on practice exams)
- learn subnetting and do steps 1 - 3.
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