Which of the following options areIPSec VPNSupported encapsulation modes? (multiple choice)

Which of the following is true about firewall security policies?

"Be good at observation" and "keep suspicion" can help us better identify security threats in the online world.

In some scenarios, it is necessary to convert the source IP address, but also convert the destination IP address, which technology of the following is used by these scenarios?

Regarding the sequence of call establishment procedures for L2TP corridors, which of the following descriptions is correct?
1. Establish L2TP tunnel
2. Establish a PPP connection
3. LNS authenticates users
4. User access to intranet resources
5. Establish an L2TP session