E-lins industrial wireless 4g lte modem ethernet with POE functi

The exchange algorithm is relatively simple, and it is the same for most routing protocols. In most cases, a host decides to send data to another host. After obtaining the address of the router by some method, the source host sends a pointer to the industrial wireless 4g lte modem ethernet router. For data packets with physical (MAC) addresses, the protocol address points to the destination host.

After checking the destination protocol address of the data packet, the router determines whether it knows how to forward the packet. If the router does not know how to forward it, it usually discards it. If the router knows how to forward, it changes the destination physical address to the next hop physical address and sends it to it. The next hop may be the final destination host, if not, usually another router, it will perform the same steps. When a packet flows in the network, its physical address is changing, but its protocol address is always the same.

The exchange between the source system and the destination system is described above. ISO defines the layered terminology used to describe this process. In this terminology, network devices that do not have the ability to forward packets are called end systems (ES--end systems), and those that have this capability are called intermediate systems (IS--intermediate systems). IS is further divided into intradomain IS (intradomain IS) that can communicate in routing domains and interdomain IS (interdomain IS) that can communicate in routing domains. The routing domain is usually regarded as a part of the network under unified management, which complies with a specific set of management rules, also known as an autonomous system (Autonomous system). In some protocols, routing domains can be divided into routing intervals, but intra-domain routing protocols can still be used to exchange data within and between intervals.