Question: what is the difference between ping loopback and ping 127.0.0.1?
Answer: When you ping the loopback the packets are looped by the kernel on the software adapter called the loopback adapter (127.0. 0.1) this is all kernel based. When you ping your own ip packets are looped on the Network adapter on which the IP is located, so software located on the NIC like the device drivers are involved.