Motorola 2200 Administrator's Handbook page 334

Administrator's Handbook
domain name. Name identifying an organization on the Internet. Domain names consists of sets of charac-
ters separated by periods (dots). The last set of characters identifies the type of organization (.GOV, .COM,
.EDU) or geographical location (.US, .SE).
domain name server. Network computer that matches host names to IP addresses in response to Domain
Name System (DNS) requests.
Domain Name System (DNS). Standard method of identifying computers by name rather than by numeric
IP address.
DSL. Digital Subscriber Line. Modems on either end of a single twisted pair wire that delivers ISDN Basic
Rate Access.
DTE. Data Terminal Equipment. Network node that passes information to a DCE (modem) for transmission.
A computer or router communicating through a modem is an example of a DTE device.
DTR. Data Terminal Ready. Circuit activated to indicate to a modem (or other DCE) that the computer (or
other DTE) is ready to send and receive data.
dynamic DNS. Allows you to use the free services of www.dyndns.org. Dynamic DNS automatically directs
any public Internet request for your computer's name to your current dynamically-assigned IP address.
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echo interval. Frequency with which the router sends out echo requests.
encapsulation. Technique used to enclose information formatted for one protocol, such as AppleTalk,
within a packet formatted 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 understand the information.
ESP. Encapsulation Security Payload (ESP) header provides confidentiality, data origin authentication, con-
nectionless integrity, 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 por-
tions of datagrams, wrapping or unwrapping the datagram within another IP datagram. Optionally, ESP trans-
formations may perform 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.
Ethernet OAM 802.3ah. 802.3ah Ethernet in the First Mile (EFM) Operations Administration and Mainte-
nance (OAM) is a group of network management functions that provide network fault indication, perfor-
mance information, and diagnosis using special-purpose Ethernet OAM frames. These are exchanged
between your Gateway and service provider Access Node (AN) devices for network fault management, per-
formance analysis and fault isolation.
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