Which three circumstances can cause a GRE tunnel to be in an up/down state? (Choose three)

Which three circumstances can cause a GRE tunnel to be in an up/down state? (Choose three)
A . The tunnel address is routed through the tunnel itself
B . The ISP is blocking the traffic
C . A valid route to the destination address is missing from the routing table
D . The tunnel interface IP address is misconfigured.
E . The tunnel interface is down
F . An ACL is blocking the outbound traffic

View Answer

Answer: ACE