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IP and MAC addresses

Nodes - hosts and routers have IP addresses and additionally MAC addresses that identify each adapter. Each transmitted IP datagram, including source and destination IP addresses, is encapsulated in MAC frame with the appropriate source and destination MAC addresses.

Let us now examine the following example where the station A wants to send a packet to the station B. As the packet travels along the path from the station A to station B, the IP and MAC addresses in the packet should be dragged in the correct fields. Please note, that the IP addresses are used for end-to-end transmission at the network layer while the MAC addresses are link-layer addresses and therefore used only in a subnet.

If you have filled in the correct addresses, the packet will move forward to the next link!