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CCNA Notes : Cont... 29.  Routers can make alternate route decisions based on ICMP messages, if appropriate. Routers send an ICMP message if the destination is unreachable. 30. Port numbers are used by TCP/ UDP to set up sessions with other hosts. The following are the recommended port numbers: 1.     Numbers 0 - 255 are used for public applications. 2.     Numbers 255 - 1023 are assigned to companies so that they can use these port numbers in their applications. 3.     Numbers above 1023 are used by upper layers to set up sessions with other hosts and by TCP to use as source and destination addresses.