Motorola 7.7.4 manual Ethernet crossover cable. See crossover cable, 321

encapsulation. Technique used to enclose information format- ted for one protocol, such as AppleTalk, within a packet format- ted for a different protocol, such as TCP/IP.

Encrypt Protocol. Encryption protocol for the tunnel session.

Parameter values supported include NONE or ESP.

encryption. The application of a specific algorithm to a data set so that anyone without the encryption key cannot under- stand the information.

ESP. Encapsulation Security Payload (ESP) header provides confidentiality, data origin authentication, connectionless integ- rity, anti-replay protection, and limited traffic flow confidentiality. It encrypts the contents of the datagram as specified by the Security Association. The ESP transformations encrypt and decrypt portions of datagrams, wrapping or unwrapping the dat- agram within another IP datagram. Optionally, ESP transforma- tions may perform data integrity validation and compute an Integrity Check Value for the datagram being sent. The com- plete IP datagram is enclosed within the ESP payload.

Ethernet crossover cable. See crossover cable.

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FCS. Frame Check Sequence. Data included in frames for error control.

flow control. Technique using hardware circuits or control char- acters to regulate the transmission of data between a computer (or other DTE) and a modem (or other DCE). Typically, the modem has buffers to hold data; if the buffers approach capac-

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