Wait, I'm confused. Is it IKE SA or IKE SB that's established in the first stage? I feel like I learned this in class, but I'm drawing a blank right now. Gotta focus and remember the details.
I'm pretty confident about this one. I know that BeanPostProcessors are called during the bean initialization phase, and that we can implement custom ones for our Spring applications.
Ah, I see now. The PING command tests the network layer (Layer 3) and the physical layer (Layer 1) by checking if the remote host is reachable and receiving the ICMP echo reply. It doesn't directly test the data link layer (Layer 2) or the transport layer (Layer 4).
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