Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2200)

Appendix B: Glossary
Software Reference for x310 Series Switches
B.10 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
DNS
Domain Name System. DNS allows you to access remote systems by entering human-
readable device host names rather than IP addresses. DNS works by creating a mapping
between a device name, such as
http://www.alliedtelesis.com , and its IP address. These
mappings are held on DNS servers. The benefits of DNS are that domain names:
■ Can map to a new IP address if the host’s IP address changes.
■ Are easier to remember than an IP address.
■ Allow organizations to use a domain name hierarchy that is independent of any IP
address assignment.
For more information see “Domain Name System (DNS)” on page 24.6 .
DNS relay
DNS Relay provides the presence of a local virtual DNS server on your AlliedWare Plus
TM
device which can service DNS lookup requests sent to it from local hosts. The DNS Relay
will usually relay the requests to an external, or upstream, DNS server.
For more information see “DNS Relay” on page 24.7 .
DoS
Denial of Service. A generic term for attacks that reduce or stop the operation of a
network.
DSCP value
The Differentiated Services Code Point within the TOS field of an IP packet header. This is a
6-bit number in the range 0-63.
Duplex mode
See Full duplex and Half duplex .
Dynamic channel group
A dynamic channel group also known as a LACP channel group, an etherchannel, or a
LACP aggregator, enables a number of ports to be dynamically combined to form a single
higher bandwidth logical connection. See
LACP .
For an more information see “Link Aggregation Control Protocol (LACP)” on page 20.3 .
For a configuration example see “Configuring an LACP Channel Group” on page 20.5 .
Dynamic Link Failover
Dynamic Link Failover (Host Attach) is a versatile feature that enables devices that do not
support link aggregation to form multiple active links by using
Triggers and Scripts . You
can customize Dynamic Link Failover to suit almost any situation, from a simple redundant
backup link to multiple active links capable of basic load-sharing.
E
EAP
Extensible Authentication Protocol. EAP carries out the authentication exchange between
the supplicant and the authentication server.