Hi guys,
I am new to this forum and I am glad to announce that I have passed WCNA(Wireshark Certified Network Analyst) on December 20th. I finished the exam in 33 minutes of 120 minutes total, from my perspective, the exam is not very hard if you read and understand the book The Official Wireshark Certified Network Analyst Study Guide thoroughly.
The skills I acquired from preparing for the exam outweighs the certification(by the way, i haven't received that after 10 business days, they promise to send it in 15 business days

)
I currently work as a malware analyst and I want to become an intrusion detection analyst someday, so I am preparing for the GCIA now.
At last, I want to express my special thanks to docrice, his posts are helpful in preparing for the WCNA and GCIA exams.