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

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

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

Explanation:



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