Based on the provided diagram of a network router's forwarding mechanism, determine the output link for an arriving packet with the header value '0111'. Refer to the local forwarding table shown in the image.

Answer

The image demonstrates the process of packet forwarding in a network router. When a packet arrives at a router, the router examines a specific value in the packet's header. It then uses its personal 'Local Forwarding Table' (Tabella locale di inoltro) to decide which outgoing link (collegamento d'uscita) the packet should be sent through. Following the steps in the diagram: 1. Incoming Packet: A packet arrives with the header value '0111' indicated in the box labeled 'Valore nell'intestazione del pacchetto in arrivo'. 2. Table Lookup: We look at the 'Tabella locale di inoltro' for the router receiving the packet. This table has two columns: 'valore di intestazione' (header value) and 'collegamento d'uscita' (output link). 3. Matching: We find the row where the header value is '0111'. 4. Determination: In the row for '0111', the corresponding value in the output link column is '2'. Therefore, the packet with header value '0111' will be forwarded through output link 2, as indicated by the arrows pointing toward link 2 in the network graph.