infrastructure?

Which two statements regarding Cisco SD-WAN vEdge routers can mitigate DoS attacks against the

infrastructure? (Choose two.)
A . Open Certificate Authority and automated enrollment feature.
B . By default, all incoming traffic is denied at the transport (WAN) side interfaces.
C . Only authorized controllers are allowed to communicate back to the vEdge router after the vEdge
router establishes connections with the controllers.
D . In case of direct Internet access, the only traffic allowed back is the traffic matching the state table
entries on the vEdge router.
E . The vEdge routers run on hardened Linux operating systems.

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Answer: CE