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2025-04-05 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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Introduce:
First, there are two key concepts, one is Internet communication, which is done by sending data at layer 3 using the network layer address, and the other is the actual transmission of the data, which occurs at layer 2 using the data link layer address.
Second, you need to know what layer 2 and layer 3 addressing is?
There are two layers when it comes to addressing, that is, the data link layer and the network layer.
Layer 2 address: it can be used for local direct transmission between hardware devices for communication, and can be used to implement basic LAN, WLAN, WAN technologies.
Layer 3 address: it is used in the Internet to create an equivalent huge virtual network at the network layer.
The important difference between layer 2 addresses and layer 3 addresses: layer 2 involves directly connected devices in the same network, while layer 3 involves indirectly connected devices and directly connected devices.
Transmission at each hop (when a request is sent using an IP address, only one hop at a time, from one physical network to another): the actual transmission occurs at the data link layer and the physical layer
Why address resolution?
Because the logical communication of the device on the network is at the layer 3 address, but in practice, the device transmission uses the layer 2 address, so there is no direct correspondence between the two addresses, so it is necessary to find a way to achieve the translation between layer 2 address and layer 3 address.
General address resolution methods:
1. Direct mapping
2. Dynamic analysis
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