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URL: http://www.ietf.org/rfc/rfc1221.txt
The
Host Access Protocol (HAP) is a network layer protocol (as is X.25).
("Network layer" here means ISO layer 3 lower, the protocol layer
below the DoD Internet Protocol (IP) layer [3] and above any link layer
protocol.) HAP defines the different types of host-to-network control messages
and host-to-host data messages that may be exchanged over the access link
connecting a host and the network packet switch node. The protocol establishes
formats for these messages, and describes procedures for determining when each
type of message should be transmitted and what it means when one is received.
Keywords:
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