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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
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,
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