Draytek VigorPro 5510 Series User Manual page 80

Strict Security
Checking
for the router to verify if the retransmitted data is the same as the
old one.
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For the sake of security, you might want the router executing
strict security checking for data transmission. The router
performance will be affected if you invoke strict security
checking.
Anti-Virus – Check this box to execute the critical checking for
virus.
Anti-Spam – Check this box to execute the critical checking for
e-mails.
In sequence – Check this box to execute the critical checking for
all the files in sequence.
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VigorPro5510 Series User's Guide