If a router is performing basic routing functions, the first step in the transmission of a packet is that the router would receive a packet of data on one of its active interfaces.
Each data (message) is broken up into small pieces or fragments that are generally referred to as packets, which are sent individually and thereby, making the Internet more reliable.
Additionally, packets often arrive out of order, and as such they must include information (frames) about the order in which the packets should be arranged, as well as an identification of who the sender and receiver should be.
In conclusion, we can reasonably and logically deduce that the first step in the transmission of a packet on a is router is to receive packets of data on one of the router's active interfaces.
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