Netopia 6.3 - Manual (Page 148)

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Appendix B
Glossary
Appendix B
10Base2
IEEE 802.3 specification for Ethernet that uses thin coaxial cable to run
at 10 Mbps. Limited to 185 meters per segment. 10Base5 IEEE 802.3
baseband physical layer specification for Ethernet that uses thick
coaxial cable to run at 10 Mbps. Limited to 500 meters per segment.
10Base-T IEEE 802.3 specification for Ethernet that uses unshielded twisted pair
(UTP) wiring with RJ-45 eight-conductor plugs at each end. Runs at 10
Mbps.
-----A-----
ACK Acknowledgment. Message sent from one network device to another
to indicate that some event has occurred. See NAK.
access rate Transmission speed, in bits per second, of the circuit between the end
user and the network.
adapter Board installed in a computer system to provide network communica-
tion capability to and from that computer system.
address mask See subnet mask.
ADSL Asymmetric Digital Subscriber Line. Modems attached to twisted pair
copper wiring that transmit 1.5-9 Mbps downstream (to the sub-
scriber) and 16 -640 kbps upstream, depending on line distance.
AH The Authentication Header provides data origin authentication, con-
nectionless integrity, and anti-replay protection services. It protects
all data in a datagram from tampering, including the fields in the
header that do not change in transit. Does not provide confidentiality.
ANSI American National Standards Institute.
ASCII American Standard Code for Information Interchange (pronounced
ASK-ee). Code in which numbers from 0 to 255 represent individual
characters, such as letters, numbers, and punctuation marks; used in
text representation and communication protocols.
asynchronous
communication Network system that allows data to be sent at irregular intervals by
preceding each octet with a start bit and following it with a stop bit.
Compare synchronous communication.
AUI Attachment Unit Interface. Connector by which a thick (802.3) Ethernet
transceiver cable is attached to a networked device.
Auth Protocol Authentication Protocol for IP packet header. The three parameter val-
ues are None, Encapsulating Security Payload (ESP) and Authentication
Header (AH).
-----B-----
backbone The segment of the network used as the primary path for transporting
traffic between network segments.
baud rate Unit of signaling speed equal to the number of number of times per
second a signal in a communications channel varies between states.
Baud is synonymous with bits per second (bps) if each signal repre-
sents one bit.
binary Numbering system that uses only zeros and ones.
Blowfish A 64-bit block cipher, contains a variable length key of maximum 448
bits.