Which option is not valid for using the public Internet as a backup WAN medium?

Posted by: Pdfprep Category: 200-310 Tags: , ,

Which option is not valid for using the public Internet as a backup WAN medium?
A . IP Security (IPSec) tunnels
B . Shared PVC
C . IP routing without constraints
D . Generic Routing Encapsulation (GRE) tunnels

Answer: B

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