Netopia 2200 series Software User's Manual page 316

encapsulation. Technique used to enclose information formatted for one
protocol, such as AppleTalk, within a packet formatted for a different proto-
col, 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 any-
one without the encryption key cannot understand the information.
ESP. Encapsulation Security Payload (ESP) header provides confidentiality,
data origin authentication, connectionless integrity, anti-replay protection,
and limited traffic flow confidentiality. It encrypts the contents of the data-
gram 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 transformations may per-
form data integrity validation and compute an Integrity Check Value for the
datagram being sent. The complete IP datagram is enclosed within the ESP
payload.
Ethernet crossover cable. See crossover cable.
-----F-----
FCS. Frame Check Sequence. Data included in frames for error control.
flow control. Technique using hardware circuits or control characters to reg-
ulate 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 capacity, the modem signals the computer to stop while it
catches up on processing the data in the buffer. See CTS, RTS, xon/xoff.
fragmentation. Process of breaking a packet into smaller units so that they
can be sent over a network medium that cannot transmit the complete
packet as a unit.
frame. Logical grouping of information sent as a link-layer unit. Compare
datagram, packet.
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