Question: In Figure 2.10, when the IP protocol decapsulates the transport-layer packet, how does it know to which upper layer protocol (UDP or TCP) the packet

In Figure 2.10, when the IP protocol decapsulates the transport-layer packet, how does it know to which upper layer protocol (UDP or TCP) the packet should be delivered?

Figure 2.10

HTTP DNS SNMP •• ISNMP HTTP FTP FTP DNS TCP UDP TCP UDP IP IP b. Demultiplexing at destination a. Multiplexing at so

HTTP DNS SNMP ISNMP HTTP FTP FTP DNS TCP UDP TCP UDP IP IP b. Demultiplexing at destination a. Multiplexing at source

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