A set of protocols that allow systems to communicate information about the state of services on other systems. It is used; for example; in determining whether systems are up; maximum packet sizes on links; whether a destination host/network/port is a

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1. A set of protocols that allow systems to communicate information about the state of services on other systems. It is used; for example; in determining whether systems are up; maximum packet sizes on links; whether a destination host/network/port is a