A MAC address is more like an ID card, a unique identifier.In order for a network packet to travel from one place to another, it needs to have a location function as well as a definite address.All 1: indicates that packets are sent to all devices on the subnet, that is, broadcast. Host ID of the IP address All 0: indicates the entire subnet.The first part is the network number, and the second part is the host number. Classes A, B, and C are divided into two parts.This address is used for native communication and is returned directly after processing by the kernel, never appearing on any network Lo, full name is loopback, also known as The loopback interface, are often assigned to 127.0.0.1This address.An IP address is the communication address of a network card in the network world, which is equivalent to our real world house number.Next, let's talk about a part that is inseparable from network communication: the IP address. We have described the process from God's perspective, leaving out many of the details. In the previous article, Generating HTTP messages for Network communications, we explained how to generate HTTP messages for browsers and use them to conduct data interaction with servers. But the brave fight, and eventually dominate the self - Napoleon preface
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